Accton Technology Switch 12i User Manual
Fast EtherHub 3500 System  
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Copyright (c) 1996 by Accton Technology Corporation. All rights reserved.  
No part of this document may be copied or reproduced in any form or by any means without the prior written  
consent of Accton Technology Corporation.  
Accton makes no warranties with respect to this documentation and disclaims any implied warranties of  
merchantability, quality, or fitness for any particular purpose. The information in this document is subject to change  
without notice. Accton reserves the right to make revisions to this publication without obligation to notify any person  
or entity of any such changes.  
Before operating this product, please review the statements on electomagnetic emission interference and safety  
compliance in Appendix D.  
International Headquarters  
No. 1 Creation Road III,  
USA Headquarters  
1962 Zanker Road  
Science-based Industrial Park  
Hsinchu 300, Taiwan, R.O.C.  
Phone: 886-3-5770-270  
FAX: 886-3-5770-267  
BBS: 886-3-5770-654  
San Jose, CA 95112  
Phone: 408-452-8900  
FAX: 408-452-8988  
BBS: 408-452-8828  
FAST FAX: 408-452-8811  
Internet: [email protected]  
Accton, EtherHub, SmartWatch, SmartExtender and AccView and are trademarks or registered trademarks of  
Accton Technology Corporation. Other trademarks or brand names mentioned herein are trademarks or registered  
trademarks of their respective companies.  
EH3512I-TX  
EH3512M-TX  
E1296-R01  
150136-101  
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Package Contents  
Carefully unpack the contents of the package and verify them  
against the checklist given below. This checklist applies to all  
the Fast EtherHub 3500 Series models unless otherwise specified.  
Package Checklist  
æ Fast EtherHub-12i  
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports  
(Model No. EH3512I-TX)  
or Fast EtherHub-12mi SNMP  
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports;  
including SNMP Managment Support  
(Model No. EH3512M-TX)  
æ Two mounting brackets  
æ Four rubber foot pads  
æ One AC power cord  
æ One 20 cm FlexBus 3500 stack cable  
æ Installation manual  
æ Owner registration card  
Please inform your dealer immediately should there be any  
wrong, missing, or damaged parts.  
If possible, retain the carton, including the original packing  
materials. Use them again to repack the unit in case there is a  
need to return it for repair.  
To qualify for product updates and product warranty  
registration, fill in the Owner Registration Card and return it  
to Accton Technology Corporation.  
@
Package Contents  
i
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Quick Installation  
Accton’s Fast EtherHub 3500 models each contain 12 Fast  
Ethernet (100BASE-TX) RJ-45 ports, one MDI daisy-chain port,  
and one slot for an optional connection using 100BASE-TX  
(10BASE-T), 100BASE-T4 or 100BASE-FX.  
The smart design built into the front display panel and  
configure options provide a friendly interface that simplifies  
installation and network troubleshooting. If you are already  
familiar with basic network operations, you should be able to  
install this hub as described below:  
1. Unpack the Fast EtherHub 3500 unit.  
2. Find a location close to the network devices you need to  
connect, and within easy reach of an electrical outlet.  
3. Mount the hub on a desktop or any other flat surface. If you  
are installing multiple hubs, you can stack them on top of  
each other (after attaching the foot pads), or install them in a  
standard EIA 19-inch rack.  
These hubs are suitable for  
desktop or rack mounting  
Attach PCs to the station ports  
4. Connect any devices that use a standard network interface  
to the RJ-45 (MDI-X) station ports (e.g., a workstation,  
server or router). Use 100W Category 5 unshielded twisted-  
pair (UTP) or 100W shielded twisted-pair (STP) cable. Also  
be sure that the length of any twisted-pair connection does  
not exceed 100 meters. (Refer to Chapter 2 for a more  
detailed description of calculating the maximum cable length  
permitted between two end nodes.)  
Attach each hub in the stack  
with FlexBus 3500 stack cable  
5. If you are stacking multiple hubs, connect the FlexBus 3500  
stack cable between the “Out” and “In” backplane ports on  
adjacent hubs. Run a simple chain starting at the Out port on  
the top hub in the stack, and ending at the In port on the  
bottom hub in the stack. No more than 6 hubs can be  
connected via the backplane bus.  
Quick Installation  
iii  
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Fast EtherHub 3500 System User’s Guide  
Attach each hub to one of the  
backplane segments  
6. Connect each hub to one of the 3 Fast Ethernet segments  
embedded in the backplane bus using either on-board  
configuration (Chapter 4) or optional network management  
software (e.g., AccView/Open). You can leave a hub isolated  
from the backplane if required for your network environment  
(e.g., to restrict network access for the attached user group).  
However, you should be careful to structure your network  
connections so that nodes which communicate frequently are  
located in the same segment. (Factory default is Segment 1.)  
Use the SmartExtender Module to  
interconnect different segments in  
the stack  
7. Bridge the different backplane segments in the Fast Ethernet  
3500 stack by running a connection from the optional  
100BASE-TX extender module on this hub to any station  
port on another hub in the stack that has been assigned to a  
different segment. Remember that devices connected to the  
switching port exist in a separate segment (and unless also  
connected to the FlexBus management channel) cannot be  
controlled by a management agent in the stack. When  
connecting a hub to the expansion port, the maximum cable  
length is 100 meters.  
Or interconnect the stack’s  
segments by attaching the daisy-  
chain port to a switch, or the  
station ports to a router  
8. If you do not have any available SmartExtender Modules,  
the different segments in a Fast EtherHub 3500 stack can  
also be combined into an interconnected network by running  
a cable from the hubs’ daisy-chain ports (i.e., using port  
12MDI on hubs attached to the different segments) to a  
network interconnection device such a switch; or by running  
a cable from the hubs’ station ports (i.e., using ports on hubs  
attached to different segments) to a router.  
Attach to the extended network  
via the daisy-chain port  
9. You can also attach the overall stack to a network intercon-  
nection device via the daisy-chain port (when connecting to  
a switch) or via a station port (when connecting to a router).  
Run straight-through twisted-pair cable from the hub to the  
other device. When attaching to a switch, run cable from the  
MDI daisy-chain port on this hub to any (MDI-X) station  
port on the switch (or vice versa).  
Note: When using the 12MDI daisy-chain port, remember that port  
12X cannot be used.  
iv  
Quick Installation  
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Fast EtherHub 3500 System User’s Guide  
Or attach to the extended  
network via the SmartExtender  
Module  
10. If an optional SmartExtender Module is installed in the  
expansion port, it can be used to make a bridged connection  
from this hub to another network device using 100BASE-TX  
(10BASE-T), 100BASE-T4 or 100BASE-FX media types.  
When connecting a node to the expansion port, the maxi-  
mum cable length is 100 meters for twisted-pair cable, and 2  
kilometers for fiber. (Refer to Chapter 2 for a more detailed  
description of calculating the maximum length permitted for  
fiber optic cable.)  
The SmartExtender Module can  
be used to attach to another  
network device that uses a  
different media type  
Attach the SmartExtender Module  
to a hub, switch, bridge or router  
You can use the extender module to bridge this hub to  
another Ethernet or Fast Ethernet hub or stack; or to attach it  
to a network interconnection device, such as a switch, bridge  
or router. However, when using the expansion port to cascade  
to other networking devices outside the stack, note that the  
maximum cascade length should be limited to 7 devices.  
Transmission speed is automatically  
set for any connection made to the  
SmartExtender Module  
For integrating legacy networks, the 100BASE-TX extender  
module provides for connection via either 100BASE-TX or  
10BASE-T. All 100BASE entender modules use auto-sensing  
to set the transmission speed at 10 or 100 Mbps. In other words,  
this module can correctly set the transmission speed for the  
attached device, even if it does not support auto-negotiation.  
Transmission mode automatically  
configured for the connected device  
only if it supports auto-negotiation  
The extender modules, except for 100BASE-T4, support both  
half-duplex and full-duplex communications. However, for  
this hub to correctly set the transmission mode, the attached  
device must also support auto-negotiation. If auto-negotiation  
fails, the transmission mode defaults to half duplex. If this  
setting is not suitable, then the transmission mode must be  
manually configured via on-board configuration (Chapter 4)  
or optional network management software (e.g., AccView/Open).  
To reactivate auto-negotiation, just unplug a connection from  
the port on the hub and plug it in again. Remember that full-  
duplex mode can only be used for a dedicated link, such as that  
provided by the SmartExtender Module. When connecting to a  
shared collision domain (i.e., another hub) set the transmission  
mode for half duplex.  
Use half duplex for a  
shared collision domain  
Quick Installation  
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Difference in connecting to the  
extended network via the daisy-  
chain port or SmartExtenter Module  
The Fast EtherHub 3500 stack can be connected to a larger  
network using any device such as a switch, bridge or router.  
Depending on your network configuration, you may attain  
better performance by making a direct connection from the  
daisy-chain port (or a station port) on this hub to an  
interconnection device. Making a connection from an  
extender module may introduce slightly more delay.  
Check your connections  
11. Verify network communications by ensuring that -  
• you have made all the necessary connections  
• you can access any connected resources  
• the hub’s indicators are functioning properly  
If you encounter any problems in installing the Fast EtherHub  
3500 system, refer to Chapter 2 for a detailed description of  
installation procedures, or to Appendix A for help in  
troubleshooting.  
vi  
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About this Guide  
This guide is designed for the experienced network installer.  
It describes how to install and operate Accton’s Fast EtherHub  
3500 system. After reading this manual, you should be able to  
use the front display panel and configure options to manage all  
your network connections.  
This manual covers the following topics:  
Chapter 1  
Chapter 2  
- Product Overview  
Brief description of Fast Ethernet, followed by a description of  
this hub and a summary of its important features and  
specifications.  
- Installing the System  
Installing a Fast EtherHub 3500 and making basic network  
connections. Also includes a description of significant  
components on the hub including ports and indicators.  
Chapter 3  
Chapter 4  
- Setting up Network Connections  
Shows sample network configurations for a local area network.  
- Configuring the System  
Describes how to manage the system via the on-board  
configuration program.  
Chapter 5  
- Hardware Reference  
Detailed description of indicator panel and ports.  
Appendices - Troubleshooting, cable assignments, and product specifications.  
About this Guide  
vii  
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Contents  
Chapter 1: Product Overview  
1-1  
Introduction to Fast Ethernet  
1-1  
1-1  
1-5  
1-6  
1-9  
1-9  
1-9  
1-10  
Brief Description of the Fast EtherHub 3500 System  
Distinguishing Factors of Fast EtherHub 3500 System  
Basic Features of Fast EtherHub 3500 System  
Data Switching with the SmartExtender Modules  
Switching Technology  
Configuration Options for the SmartExtender Modules  
Switching Methods  
Chapter 2: Installing the System  
2-1  
Pre-Installation Requirements  
Hardware Installation  
2-1  
2-2  
Stacking Hubs without a Rack  
Mounting Hubs in a Rack  
2-2  
2-3  
Connecting the Hub System  
Making a Connection via an MDI-X Station Port  
Connecting to the Stack’s Backplane  
Making a Connection via the MDI Daisy-Chain Port  
Connecting to a SmartExtender Module  
Installing a Backup Power Supply  
Powering on the Hub  
2-4  
2-4  
2-5  
2-6  
2-6  
2-11  
2-12  
2-12  
2-13  
2-14  
2-14  
2-15  
2-15  
Diagnostic Tests  
Hot Remove  
Configuring a Manageable Stack  
Installing an SNMP Backup Agent  
Verifying Port Status  
Verifying System Operation  
Contents  
ix  
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Fast EtherHub 3500 System User’s Guide  
Chapter 3: Setting up Network Connections 3-1  
Special Architecture Used for the Fast EtherHub 3500 Stack  
Multi-Segment Architecture  
3-1  
3-1  
FlexBus Management Link  
3-2  
Hub ID Setting  
3-2  
Using Management Agents  
3-2  
Port Backup Function  
3-4  
Security Features  
3-4  
Sample Network Configurations  
Attaching the Stack to One Segment  
Attaching the Stack to Multiple Segments  
Isolating Specific Hub Connections  
Isolating Each Hub  
3-5  
3-5  
3-6  
3-7  
3-8  
Extending the Network with Alternate Connections  
Linking the Stack to a Management Station  
Interconnecting the Segments  
3-9  
3-10  
3-11  
3-12  
3-13  
3-14  
3-15  
Connecting Remote Stacks  
Operating in the Novell NetWare IPX Environment  
Operating in the TCP/IP Environment  
Connecting to the Network Backbone  
Chapter 4: Configuring the System  
4-1  
Making the Connections Required for System Configuration  
Direct Connection  
4-1  
4-2  
4-2  
4-3  
4-3  
4-4  
4-4  
4-4  
4-4  
4-5  
4-5  
Network Connection  
Local In-Band Telnet Connection  
Local In-Band Network Connection  
Remote Connection  
Configuring the Fast EtherHub Site  
Configuring the Remote Site  
Remote Configuration Methods  
Accessing the Configuration Management Program  
Configuring Your System with the On-board Program  
Using the Fast EtherHub 3500 System Configuration Program 4-7  
System Configuration Program for the Fast EtherHub-12i  
Configuring the SmartExtender Port  
4-8  
4-9  
x
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Fast EtherHub 3500 System User’s Guide  
System Configuration Program for the 12mi and Stack  
Exiting the Configuration Program  
Restarting the Agent  
4-11  
4-12  
4-13  
4-14  
4-15  
4-16  
4-17  
4-18  
4-19  
4-21  
4-25  
4-29  
4-30  
4-32  
4-34  
4-35  
4-36  
4-37  
4-38  
4-39  
Displaying System Information  
Configuring the SNMP Agent  
Configuring SNMP Communities  
Configuring IP Trap Managers  
Configuring IPX Trap Managers  
Changing the Segment Configuration  
Configuring Hub Parameters  
Configuring Port Parameters  
Defining Backup Ports  
Port Intrusion Control  
Downloading System Software via a TFTP Server  
Xmodem Download  
Changing User Passwords  
Console Lockout  
Segment Statistics  
Hub Statistics  
Port Statistics  
Chapter 5: Hardware Reference  
5-1  
Indicator Panel  
5-2  
5-2  
5-2  
5-3  
5-4  
5-4  
5-5  
5-5  
5-6  
5-7  
5-7  
5-7  
5-8  
5-10  
5-11  
Power Indicator  
SmartExtender Module Indicator  
Interhub  
SNMP  
Segment Indicators  
Management Agent Indicators  
Hub ID Indicator  
Serial  
Terminator  
Isolation  
Utilization Indicators  
Collision Indicators  
Port Status Indicators  
Diagnostic Test Indicators  
Contents  
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Fast EtherHub 3500 System User’s Guide  
Network Connections  
Station Ports  
5-13  
5-13  
5-13  
5-14  
5-15  
5-15  
5-16  
5-16  
5-16  
Daisy-Chain Port  
Serial Port  
Rear Panel Components  
Power Supply Modules  
FlexBus Ports  
In  
Out  
Appendix A: Troubleshooting  
A-1  
Diagnosing Hub Indicators  
System Diagnostics  
Power and Cooling Problems  
Installation  
A-1  
A-2  
A-2  
A-2  
A-4  
A-4  
Physical Configuration  
System Integrity  
Appendix B: Pin Assignments  
B-1  
RJ-45 Port  
DB9 Serial Port Pin Description  
Hub’s 9-Pin Serial Port to PC’s 9-Pin COM Port  
Hub’s 9-Pin Serial Port to PC’s 25-Pin DTE Port  
Hub’s 9-Pin Serial Port to Modem’s 25-Pin DCE Port  
B-1  
B-2  
B-3  
B-4  
B-5  
Appendix C: Product Specifications  
C-1  
Product Specifications  
C-1  
Appendix D: Regulatory Standards  
D-1  
EMI Warning  
D-1  
D-1  
D-2  
D-3  
D-3  
D-4  
FCC Class A Certification  
Voluntary Control Council for Interference (VCCI-1)  
EN55022 Declaration of Conformance  
CE Mark Declaration of Conformance  
Safety Compliance  
xii  
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Fast EtherHub 3500 System User’s Guide  
Underwriters Laboratories Compliance Statement  
Sicherheitshinweise  
D-4  
D-5  
Appendix E: Product Support Services  
E-1  
Product Registration  
Problem Report  
E-1  
E-1  
E-1  
E-2  
E-2  
E-3  
E-3  
E-4  
E-4  
E-5  
E-6  
E-7  
Hardware Repair Service  
Software Update and Upgrade Service  
Bulletin Board Service (BBS)  
Interactive Fast Fax (U.S.A. office)  
Technical Support  
Limited Warranty  
Customer Remedies  
Return Process  
Accton Offices  
Ordering Information  
Glossary  
Index  
Contents  
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Fast EtherHub 3500 System User’s Guide  
List of Figures  
Figure 2-1 Stacking Hubs without a Rack  
2-2  
Figure 2-2 Mounting Hubs Using a Mounting Rack  
Figure 3-1 Attaching All Hubs in Stack to One Segment  
Figure 3-2 Attaching Hubs in Stack to Three Segments  
Figure 3-3 Linking Part of the Stacked Hubs to a Segment  
Figure 3-4 Stacked Hubs Not Linked to a Segment  
Figure 3-5 Linking Stacked Hubs to Unmanaged Hubs  
Figure 3-6 Linking Stacked Hubs to an NMS  
2-3  
3-5  
3-6  
3-7  
3-8  
3-9  
3-10  
3-11  
3-12  
Figure 3-7 Linking Segments in a Stacked System  
Figure 3-8 Connecting Remote Stacks  
Figure 3-9 System Applied in Novell NetWare IPX Environment 3-13  
Figure 3-10 System Applied in TCP/IP Environment  
Figure 3-11 Connecting to the Network Backbone  
Figure 4-1 Main Configuration Menu (12i only)  
3-14  
3-15  
4-8  
Figure 4-2 Configuration Menu for Extender Module (12i only) 4-9  
Figure 4-3 Main Configuration Menu  
Figure 4-4 Screen Messages for System Resart  
Figure 4-5 System Information Menu  
Figure 4-6 SNMP Configuration Menu  
Figure 4-7 SNMP Communities Menu  
Figure 4-8 IP Trap Managers Menu  
Figure 4-9 IPX Trap Managers Menu  
Figure 4-10 Segment Configuration Menu  
Figure 4-11 Hub Configuration: Hub Selection Menu  
Figure 4-12 Hub Configuration Menu  
Figure 4-13 Hub ID Configuration Menu  
Figure 4-14 Port Configuration: Port Selection Menu  
Figure 4-15 Port Configuration Menu  
Figure 4-16 SEM Port Configuration Menu  
Figure 4-17 Port Backups Menu  
4-11  
4-13  
4-14  
4-15  
4-16  
4-17  
4-18  
4-19  
4-21  
4-22  
4-24  
4-25  
4-26  
4-27  
4-29  
4-30  
4-31  
4-32  
4-34  
4-35  
4-36  
4-37  
Figure 4-18 Port Intrusion Control: Hub Selection Menu  
Figure 4-19 Port Intrusion Control Menu  
Figure 4-20 TFTP Download Menu  
Figure 4-21 Xmodem Download Menu  
Figure 4-22 User Passwords Menu  
Figure 4-23 Console Lockout Menu  
Figure 4-24 Segment Statistics Window  
xiv  
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Fast EtherHub 3500 System User’s Guide  
Figure 4-25 Hub Statistics: Hub Selection Menu  
Figure 4-26 Hub Statistics Window  
Figure 4-27 Port Statistics: Port Selection Menu  
Figure 4-28 Port Statistics Menu  
Figure 4-29 SEM Port Statistics Menu  
Figure 5-1 Front Panel of EtherHub-12mi  
Figure 5-2 Indicators for EtherHub-12mi  
Figure 5-3 Rear Panel  
Figure B-1 RJ-45 Connector (on the Hub Side)  
Figure B-2 DB9 Serial Port (on the Hub Side)  
4-38  
4-38  
4-39  
4-40  
4-42  
5-1  
5-2  
5-15  
B-1  
B-2  
List of Tables  
Table 2.1 Calculating the Power Budget for Fiber Optics  
Table 2.2 Power Budget for Common Guage Fiber Optics  
Table 2.3 Diagnostic Test Functions  
Table 2.4 Checking Key LED Indicators  
Table 2.5 Maximum Cable Length  
2-8  
2-9  
2-13  
2-15  
2-16  
4-9  
Table 4.1 Configuration Options in Main Menu (12i only)  
Table 4.2 Configuration Options for Extender Module (12i only) 4-10  
Table 4.3 Main Configuration Menu  
Table 4.4 System Information Menu  
Table 4.5 SNMP Configuration Menu  
Table 4.6 SNMP Communities Menu  
Table 4.7 IP Trap Managers Menu  
Table 4.8 IPX Trap Managers Menu  
Table 4.9 Segment Configuration Menu  
Table 4.10 Hub Configuration Menu  
Table 4.11 Port Configuration Menu  
Table 4.12 SEM Port Configuration Menu  
Table 4.13 Port Backups Menu  
Table 4.14 Port Intrusion Control Menu  
Table 4.15 TFTP Download Menu  
Table 4.16 Xmodem Download Menu  
Table 4.17 User Passwords Menu  
Table 4.18 Console Lockout Menu  
Table 4.19 Segment Statistics Menu  
Table 4.20 Hub Statistics Menu  
4-12  
4-14  
4-15  
4-16  
4-17  
4-18  
4-20  
4-23  
4-26  
4-28  
4-30  
4-31  
4-33  
4-34  
4-35  
4-36  
4-37  
4-39  
4-41  
Table 4.21 Port Statistics Menu  
Contents  
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Table 4.22 SEM Port Statistics Menu  
Table 5.1 Power Indicator  
Table 5.2 SmartExtender Module Indicator  
Table 5.3 SmartExtender Module Indicators  
Table 5.4 Interhub Indicator  
Table 5.5 SNMP Indicator  
Table 5.6 Management Agent Indicators  
Table 5.7 Hub Indicators  
4-42  
5-2  
5-2  
5-3  
5-3  
5-4  
5-5  
5-6  
5-6  
5-7  
5-7  
5-7  
5-8  
5-9  
5-10  
5-11  
5-12  
B-1  
B-2  
Table 5.8 Serial Indicator  
Table 5.10 Terminator Indicator  
Table 5.11 Isolation Indicator  
Table 5.12 Utilization Indicators  
Table 5.13 Collision Indicators  
Table 5.14 Partition/Disable Indicators  
Table 5.15 Link/Traffic Indicators  
Table 5.16 Diagnostic Indicators  
Table 5.17 Diagnostic Results  
Table B.1 RJ-45 Pin Assignments  
Table B.2 DB9 Port Pin Assignments  
Table B.3 Full-Pin Connection from  
Hub’s 9-Pin Serial Port to PC’s 9-Pin COM Port  
Table B.4 Three-Pin Connection from  
Hub’s 9-Pin Serial Port to PC’s 9-Pin COM Port  
Table B.5 Full-Pin Connection from  
Hub’s 9-Pin Serial Port to PC’s 25-Pin DTE Port B-4  
Table B.6 Three-Pin Connection from  
Hub’s 9-Pin Serial Port to PC’s 25-Pin DTE Port B-4  
Table B.7 Hub’s 9-Pin Serial Port to  
Modem’s 25-Pin DCE Port Pin Assignments  
B-3  
B-3  
B-5  
E-7  
Table E.1 Parameters for SmartExtender Modules  
xvi  
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Chapter 1: Product Overview  
Introduction to Fast Ethernet  
Standard 10 Mbps Ethernet has served well for past generations  
of 80286 and 80386 machines performing simple file transfers.  
However, with the inevitable growth in corporate network size  
and the introduction of fully-functional 32-bit PC architectures,  
and operating systems running complex applications, 10 Mbps  
Ethernet has become a serious bottleneck.  
With the recent flood of choices for upgrading media  
bandwidth, 100 Mbps Fast Ethernet has become the most  
popular choice because of its low cost, compatibility with  
existing Ethernet applications, and the fact that it can run on top  
of an installed base of twisted-pair cabling.  
Moreover, by using a dual-speed switch (10 or 100 Mbps),  
Fast Ethernet can be easily integrated into an existing 10 Mbps  
Ethernet environment with no need for protocol translation or  
changes to network software. It also includes specifications for  
a media-independent interface (MII), which permits a switched  
connection to any of the 100BASE-T sublayers; i.e., 100BASE-  
TX (10BASE-T), 100BASE-FX or 100BASE-T4.  
Brief Description of the Fast EtherHub 3500 System  
The EtherHub 3500 System is a powerful and innovative LAN  
network enhancement and management product series. Each  
component in the system supports a Fast Ethernet multi-segment  
bus architecture that enhances traffic management and network  
bandwidth utilization. This system offers the network manager  
a wide range of flexible configuration options, allowing you to  
increase your network’s bandwidth tenfold or more. In addition,  
the entire installation can be monitored and controlled via SNMP  
protocol through any network management station.  
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Moreover, the Fast EtherHub 3500 System provides advanced  
network security features including “Intrusion Protection”  
which ensures that only designated workstations are able to  
transmit packets onto the network. Management access via the  
out-of-band serial port or in-band via telnet is also password  
protected.  
The basic components of this network system include:  
Full Connectivity  
• Provides 12 RJ-45 (MDI-X) 100BASE-TX Fast Ethernet  
(shielded) station ports for connecting devices to the network  
using straight-through shielded or unshielded twisted-pair  
cable (100W Cat 5 UTP or 100WSTP)  
• 1 RJ-45 (MDI) daisy-chain port for connection to a switching  
hub, eliminating the need for crossover cables  
• 1 slot for optional SmartExtender Modules which provide a  
connection to 100BASE-TX (10BASE-T), 100BASE-T4 or  
100BASE-FX via a switching port  
• A multi-segment bus architecture that enhances traffic  
management and network bandwidth utilization  
• 2 FlexBus ports for connecting to other hubs in a Fast  
EtherHub 3500 stack via FlexBus 3500 stack cable  
• On-board management via the RS232 serial port connected  
directly to a terminal, or to a local or remote computer (that  
provides a standard RS232 port)  
The specific components are the:  
Fast EtherHub-12i  
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports  
The Fast EtherHub-12i conforms to the IEEE 802.3u repeater  
specification. It also serves as an intelligent hub which collects  
port statistics and records events for system administration. Basic  
configuration is provided by the on-board configuration program.  
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This hub can be used in a stand-alone configuration to form a  
simple Fast Ethernet LAN networking 2 to 12 computers using  
the RJ-45 station ports. Further network expansion can be  
achieved using the embedded tri-segment backplane, the MDI  
daisy-chain port, or one of the optional SmartExtender Modules.  
Moreover, when stacked with other intelligent hubs through the  
FlexBus ports and connected to the Fast EtherHub-12mi SNMP  
management device, it can be monitored and controlled through  
in-band or out-of-band channels.  
Fast EtherHub-12mi SNMP  
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports;  
including SNMP Managment Support  
This model conforms to both the IEEE 802.3u repeater  
specification and the Simple Network Management Protocol  
(SNMP). It not only functions as a 12-port Fast Ethernet  
repeater, but also provides an on-board SNMP-based network  
management agent for monitoring and controlling various  
network components. It can monitor up to 6 intelligent hubs  
connected to the same stack (including itself) through the  
FlexBus port connection. This Fast EtherHub provides SNMP  
management for the connected stack via various Management  
Information Bases (MIBs), including MIB II, repeater MIB, and  
Accton’s private MIB.  
SmartExtender Module -  
• 100BASE-TX (EM3551-TX)  
Provides two RJ-45 ports, both of which can be connected to  
10BASE-T or 100BASE-TX media types. Transmission  
speed is automatically set to 10 or 100 Mbps via auto-  
sensing, and half or full duplex via auto-negotiation.  
• 100BASE-T4 (EM3551-T4)  
Provides two RJ-45 ports for 100BASE-T4 connection.  
Transmission speed is automatically set to 10 or 100 Mbps  
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via auto-sensing. Transmission mode for 100BASE-T4 is  
fixed at half duplex.  
• 100BASE-FX (EM3551-FX-SC or EM3551-FX-ST)  
Provides two SC or ST type connectors for 100BASE-FX  
connection. Transmission mode is automatically set to half  
or full duplex via auto-negotiation. Transmission speed is  
fixed at 100 Mbps.  
Power Module -  
Power Module (EM3550-PWR)  
Slide-in power module for use in the slots on the back of hub.  
When using two modules, the load is shared equally between  
both, reducing the chance of failure, but still providing backup  
power in case either module should fail.  
In-Band Network Managment Software -  
AccView/Open (SW6102)  
This Windows-based network management software package  
analyzes and displays data received from the Fast EtherHub  
3500 system. This package allows the network supervisor to  
access information from and set parameters for any hub in stack  
by transmiting commands to the appropriate management agent.  
AccView should be installed on the network management  
station designated to manage the Fast EtherHub 3500 stack.  
The workstation may communicate with the stack via a network  
connection or from a remote site using SLIP run over TCP/IP.  
If segmented architecture is used, the network management  
station should be connected to the same segment as the SNMP  
management agent (i.e., Fast EtherHub-12mi).  
The minimal configuration for network management station  
includes a 386 workstation with 10MB of available space on  
the hard drive, 2 MB on-board memory, a VGA display, and  
Windows version 3.1 or higher.  
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Distinguishing Factors of Fast EtherHub 3500 System  
This system provides the following key features:  
• Provides multi-segment architecture allowing the network to  
be split into three segments  
• Supports fault-tolerant configuration by allowing port link  
backup and agent backup  
• Supports management functions via SNMP  
• Supports on-board management (using Accton’s proprietary  
Fast EtherHub 3500 System Configuration Program), and full  
software configurable in-band management using the optional  
AccView/Open (network management software)  
• The on-board management agents support nearly any network  
environment by providing management options via SNMP/IP,  
SNMP/IPX and SNMP/Ethernet  
• Provides extensive security features including port intrusion  
protection, as well as password protection for out-of-band  
access or in-band telnet access  
• Supports redundant power supply  
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Basic Features of Fast EtherHub 3500 System  
In addition to all the features mentioned above, the system provides:  
Basic Repeater Functions  
• Repeats all incoming frames to the connected segment  
• Automatically partitions and reconnects devices which  
experience excessive collisions  
• Jabber lockup protection provided by disabling any port that  
receives 64 Kbytes of continues data, and re-enabling the port  
after the condition improves  
Outstanding Performance  
• Total bandwidth of up to 300 Mbps  
• The backplane contains 3 separate Ethernet segments, and  
a high-speed management channel  
• Manages up to 6 concentrators using the FlexBus stack cable  
Extensive Management  
Capabilities  
• An extensive indicator panel for reporting network activity,  
and unit configuration, and for facilitating problem diagnosis  
• Menu-driven configuration program can be accessed via a  
local or remote terminal connection to the hub’s serial port  
• The Fast EtherHub model with the SNMP agent supports  
in-band network management using optional network  
management software such as Accton’s AccView/Open (not  
included with this package) to monitor and control a stacked  
system  
• Provides one serial 9-pin RS232 port for out-of-band or  
remote in-band network management  
• BOOTP support for dynamic address assignment  
• Flash ROM on board the Fast EtherHub-12mi models for  
easily updating the SNMP agent  
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• Firmware update supported for the Fast EtherHub-12mi  
models via out-of-band Xmodem file transfer through the  
serial port, or in-band TFTP file transfer over the network  
Networking Flexibility  
(via SmartExtender Modules)  
• One slot supports optional slide-in network extender  
modules for connection to 10BASE-T, 100BASE-TX,  
100BASE-T4 or 100BASE-FX (on a separate segment)  
• Transparent bridging (between stack and external device) via  
optional network extender modules  
• Uses adaptive cut-through switching (which dynamically  
changes between fragment free cut-through and store-and-  
forward depending on the CRC error rate)  
• 100BASE-TX SmartExtender module automatically senses  
transmission speed (at 100 Mbps or 10 Mbps)  
• 100BASE-TX and 100BASE-FX SmartExtender modules  
support two interface modes: full duplex or half duplex —  
auto-negotiates transmission mode for full duplex and half  
duplex (if same feature is supported by attached device);  
otherwise can be manually configured  
• Automatically learns MAC addresses to build the routing  
information database  
• Automatically filters local traffic  
• Transparent to all higher level protocols  
Easy Installation  
• Flexible installation for desktop or rack (standard 19” size)  
• Plug-and-play  
• Self-diagnostics  
• Automatic polarity detection and correction permits  
automatic recovery due to wiring errors  
• Automatic ID assignment and auto-terminator setting for  
auto-configuration  
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• Adapts to universal wide range voltage power  
(i.e., 100V AC to 240V AC ™ 10%, 50~60 ™ 3Hz)  
• Provides a slot for an optional backup power supply  
Complete Standards  
Conformance  
• Conforms to IEEE 802.3u Class I repeater specification  
and 100BASE-TX standard (i.e., 100 Mbps Fast Ethernet)  
• Optional SmartExtender Modules conform to relevant IEEE  
specifications and standards for respective media types  
• Supports MIB II, Repeater MIB, Ethernet MIB, and  
Accton’s private MIB  
• Conforms to Simple Network Management Protocol (SNMP)  
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Data Switching with the SmartExtender Modules  
Switching Technology  
The SmartExtender Modules that plug into the expansion slot  
on the front panel of the Fast Ethernet 3500 series use advanced  
switching techniques to provide a high-speed network  
backbone. Each extender module acts as a two-port Ethernet  
switch which effectively partitions the stack from the backbone.  
The module scans the destination address from the packet  
header, searches the routing table provided for the incoming  
port and forwards the packet only if required, often before fully  
received. A learning function stores the address and corre-  
sponding segment identifier of each incoming and outgoing  
packet in a routing table. This information is subsequently  
used to filter packets whose destination address is on the same  
segment as the source address. This confines network traffic to  
its respective domain, reducing the overall load on the network.  
Configuration Options for the SmartExtender Modules  
The SmartExtender Modules can be connected to either a  
subnetwork, or directly to a server or key workstation. In  
addition to partitioning an overloaded network, they provide a  
connection between legacy 10BASE-T networks and the newer  
generation 100BASE-TX, and can be configured to operate in  
either full-duplex or half-duplex data transfer mode to support  
the interconnection requirements of other high-speed devices.  
Only the 100BASE-TX and  
100BASE-FX media support  
full-duplex operation.  
These modules perform adaptive cut-through switching,  
which is capable of instantly forwarding or filtering a packet  
according to the destination address scanned from the packet  
header. This technique transmits packets with near-zero latency.  
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As a device functioning on the media access control (MAC)  
layer, the extender modules are protocol independent, and  
therefore compatible with IEEE802.3, IEEE802.3u, TCP/IP,  
NetWare, DECnet and XNS protocols. They can provide a  
connection between conventional 10BASE-T and high-speed  
100BASE-TX networks; or can serve as a 2-port bridge in a  
100BASE-TX or 100BASE-FX environment. Moreover, where  
traditional 100BASE-TX networks restrict the maximum  
distance between end-nodes to 205 meters, these modules break  
down this barrier. By breaking your network into smaller and  
more manageable segments, each linked to the larger network  
with a SmartExtender Module, the maximum distance for  
communications between end-nodes is unlimited (depending on  
the specific timing requirements of your network applications).  
Switching Methods  
Traditional bridges and routers use a switching method called  
store-and-forward in which the entire frame must be received  
before performing a table look-up for the destination node and  
forwarding the packet to the corresponding port. As a result,  
each packet experiences a hefty delay. It may be necessary to  
use store-and-forward when a lot data errors are occurring over  
the network, or when connecting to very slow devices.  
Compared to this “conservative” mode of operation, fragment-  
free cut-through switching significantly reduces packet  
transmission delay by picking the destination address out of the  
header as soon as the first full 64 bytes has been received. This  
technique directs the frame to the appropriate segment long  
before the full packet has been received. It also cleans up the  
data stream by preventing runts from being passed along,  
thereby improving data reliability.  
Although fragment-free cut-though switching is recommended  
as the fastest method for most applications, store and forward is  
also supported by the SmartExtender Modules to guarantee  
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flawless performance. To ensure that you can manage any kind  
of network load, the extender modules provide adaptive cut-  
through switching based on Accton’s smart algorithm. This  
method dynamically changes the way it handles data based on  
the current error rate. This switching strategy start at fragment-  
free for a clean to moderately dirty data environment, and  
changes to store-and-forward for a highly contentious  
environment. By using this method, the SmartExtender  
Modules deliver the best networking performance under any  
environment.  
Moreover, in addition to using adaptive switching to optimize  
throughput, these modules also support back pressure to  
eliminate frame loss after their buffers fill by “blocking”  
unwanted traffic from being passed onto a segment.  
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Chapter 2: Installing the System  
This chapter describes how to install the Fast EtherHub unit  
and establish network connections. You may install this hub  
on any level surface (e.g., a table or shelf) or in a standard  
equipment rack. However, please take note of the following  
minimum site requirements before you begin.  
Pre-Installation Requirements  
Before you start actual hardware installation, make sure you  
can provide the right operating environment, including power  
requirements, sufficient physical space, and proximity to other  
network devices that are to be connected. Verify the following  
installation requirements:  
• Power requirements: 100 to 240 VAC (± 10%) at 50 to 60  
Hz (± 3Hz). The hub’s power supply automatically adjusts  
to accept the input voltage level.  
• The hub should be located in a cool dry place, with at least  
10 cm. of space at the front and back for ventilation.  
• Place the switch out of direct sunlight, and away from heat  
sources or areas with a high amount of electromagnetic  
interference.  
• If you intend to mount the hub on a rack, make sure you have  
the mounting screws, brackets, bolts and nuts, and the right  
tools.  
• Be sure the network cables and connectors needed for  
installation are available.  
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Hardware Installation  
This hub is suitable for desktop or rack-mount installation. A  
good location is at the center of all the devices you want to link,  
close to a collapsed backbone, and near a power outlet.  
These hubs can be stacked with other hubs using a mounting rack or  
directly on top of one another. Refer to the sections on Stacking  
Hubs without a Rack or Mounting Hubs in a Rack for a description of  
these methods.  
F
If you don’t want to stack the hub with other hubs now, or you plan to  
use the hub in a stand-alone configuration, go to the section on  
Connecting the Hub System.  
Stacking Hubs without a Rack  
If you need to install a  
The hub can be stacked anywhere there is a sufficiently large  
flat space, such as on a table or desktop.  
redundant power module,  
refer to Installing a Backup  
Power Supply on page 2-11,  
and complete that procedure  
before stacking the hub.  
1. Stick the self-adhesive rubber foot pads (that come with this  
package) on each of the 4 hollow spaces located on the  
bottom of the first hub.  
2. Place the first hub on a firm and flat surface in the area  
where you want the stack to be installed.  
3. Attach the rubber feet on each hub before stacking them.  
They cushion the hub against shock/vibrations and provide  
space between each hub for ventilation.  
Figure 2-1 Stacking Hubs without a Rack  
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Mounting Hubs in a Rack  
If you need to install a  
Please comply with the following instructions to ensure that  
your hub is securely mounted in the rack.  
redundant power module,  
refer to Installing a Backup  
Power Supply on page 2-11,  
and complete that procedure  
before stacking the hub.  
1. Use an standard EIA 19-inch rack.  
2. Use a Phillips (i.e., cross-head) screwdriver to attach the  
brackets to the sides of the hub.  
3. Position the hub in the rack by lining up the holes in the  
brackets with the appropriate holes on the rack, and then use  
the supplied screws to mount the hub in the rack.  
Figure 2-2 Mounting Hubs Using a Mounting Rack  
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Connecting the Hub System  
Remember to label all your  
connections at both ends of the  
cable to facilitate troubleshooting  
or future changes to network  
configuration.  
The Fast EtherHub has 12 RJ-45 shielded ports (i.e.,  
100BASE-TX) that support connections to 100 Mbps Fast  
Ethernet. Ports 1 - 12 (MDI-X) allow you to connect to devices  
such as a workstation, server or router. While Port 12 (MDI)  
lets you easily cascade to a compatible switch (i.e., connecting  
from MDI to MDI-X ports on either device).  
This hub also provides an expansion slot for plugging in  
optional SmartExtender Modules. These modules support a  
single connection to 100BASE-TX (10BASE-T), 100BASE-T4  
or 100BASE-FX. They provide a convenient way to attach to  
devices which use an alternate media type (e.g., linking fiber  
optic cable to a remote device).  
The transmission speed for ports on the optional 100BASE-TX  
SmartExtender Module is automatically set at 10 or 100 Mbps to  
match the operating speed of the attached device. Moreover, the  
transmission mode of the ports on the optional 100BASE-TX and  
100BASE-FX extender modules is automatically set at full or  
half duplex to match the optimum capability of the attached  
device.  
Making a Connection via an MDI-X Station Port  
You can connect an RJ-45 station port on the hub to any device  
that uses a standard LAN interface such as a workstation or  
server, or also to a network interconnection device such as a  
bridge or router (depending on the port type implemented).  
1. Prepare the network devices you wish to network. Make  
sure you have installed suitable 100BASE-TX network  
interface cards before making a connection to any of the  
hub’s station ports. You also need to prepare straight-  
through 100W Category 5 shielded or unshielded twisted-pair  
cables with RJ-45 plugs at both ends.  
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2. Connect one end of the cable to the RJ-45 port of the network  
interface card, and the other end to any available (MDI-X)  
station port on the hub. Just remember that if you use Port  
12MDI-X, the daisy-chain port (12MDI) cannot be used. When  
inserting an RJ-45 plug, be sure the tab on the plug clicks into  
position to ensure that it is properly seated. Using the hub in a  
stand-alone configuration, you can network up to 12 nodes.  
Do not plug a phone jack connector into the RJ-45 port. This may  
damage the switch. Instead, use only twisted-pair cables with RJ-45  
connectors that conform with FCC standards.  
I
1. Make sure each twisted-pair cable does not exceed 100 meters.  
2. We advise using Category 5 cable for all network connections to  
avoid any confusion or inconvenience in the future when you  
upgrade attached devices to Fast Ethernet.  
Notes:  
3. You may also connect a device to the switching port located on  
hub’s front panel if required. However, be sure you use a  
SmartExtender Module that meets your communication requirements.  
Refer to SmartExtender Module in Chapter 1 for more details.  
4. To facilitate troubleshooting, label all network cables to indicate the  
attached device and location.  
Connecting to the Stack’s Backplane  
Plug one end of the FlexBus 3500 stack cable (provided with  
the base package) in the Out port of the top hub and the other  
end to the In port of the next hub. Repeat this step for each hub  
in the stack. Form a simple chain starting at the Out port on the  
first hub and ending at the In port on the last hub. Refer to  
FlexBus Ports in Chapter 5 for related information.  
Hubs in a stack can only be grouped into segments through the  
FlexBus 3500 stack cable. You should therefore use the FlexBus ports to  
make Out to In connections in a stack.  
F
Hubs in a stack can only be managed by the network management  
agent through the stack cable. In a managed stack, you should therefore  
use the stack ports to make Out to In connections, and include a  
management agent (i.e., a Fast EtherHub-12mi) in the chain.  
You can also cascade hubs using the daisy-chain port (Port 12MDI).  
However, hubs cascaded using the daisy-chain port cannot be managed by  
the management agent. See the next section for details.  
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Making a Connection via the MDI Daisy-Chain Port  
Stackable Fast Ethernet hubs are generally restricted to Class I  
repeater types due to the timing requirements for passing traffic  
and management data across the stack’s backplane. Although  
Class I repeaters cannot be cascaded to another device in the  
same collision domain via the daisy-chain port, more powerful  
interconnection options are provided via the hub’s backplane  
and optional SmartExtender Modules.  
The Fast EtherHub 3500 hubs  
are Class I repeaters. Class I  
repeaters cannot be cascaded  
to another repeater in the same  
collision domain.  
The daisy-chain port can only  
be cascaded to another device  
which breaks up the collision  
domain (e.g., an Ethernet  
switch).  
The daisy-chain port can only be cascaded to another device  
which breaks up the collision domain (e.g., an Ethernet switch).  
Prepare straight-through 100W Category 5 shielded or  
unshielded twisted-pair cables with RJ-45 plugs at both ends.  
Connect one end of the cable to the 12MDI port on this hub,  
and the other end to a standard MDI-X station port on the other  
device. Remember that when using the daisy-chain port  
(12MDI), station port (12MDI-X) cannot be used. When inserting  
an RJ-45 plug, be sure the tab on the plug clicks into position  
to ensure that it is properly seated.  
1. Make sure the twisted-pair cable does not exceed 100 meters.  
2. To connect to a switch, you may also run straight-through twisted-  
pair cabling from a station port on this hub to a crossover port on  
the switch. However, if you must connect to a switch via station  
ports at both ends of the cable, use crossover cabling.  
Notes:  
Connecting to a SmartExtender Module  
The Fast Ethernet 3500 Series includes a network expansion  
slot on the front panel that supports connection to 100BASE-TX  
(10BASE-T), 100BASE-T4 or 100BASE-FX. Each  
SmartExtender Module acts as a two-port switch that can  
forward and filter data frames at line speed. One port is  
connected to the hub’s internal repeater bus, while the other  
port (on the hub’s front panel) can be used to connect the hub to  
any compatible network device. The optional extender modules  
include:  
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10BASE-T  
- EM3551-TX SmartExtender Module  
100BASE-TX - EM3551-TX SmartExtender Module  
100BASE-T4 - EM3551-T4 SmartExtender Module  
100BASE-FX - EM3551-FX-ST SmartExtender Module  
EM3551-FX-SC SmartExtender Module  
Note: The EM3551-TX automatically adjusts to 10 or 100 Mbps using  
auto-sensing. Refer to SmartExtender Module in Chapter 1.  
The SmartExtender Modules are not hot-swappable. Be sure you  
power off the hub before installing any of these modules.  
I
Installing a SmartExtender Module - If you need to install an  
extender module, take the following steps:  
1. Disconnect power to the hub.  
Retain the face plate for  
possible future use.  
2. Remove the face plate on the expansion slot (or a previously  
installed SmartExtender Module) by removing the two  
screws with a Phillips (i.e., cross-head) screwdriver.  
3. Before opening the package that contains the extender  
module, touch the bag to the hub casing to discharge any  
potential static electricity.  
4. Remove the module from the anti-static shielded bag.  
5. Holding the module level, gently push it all the way into the  
expansion slot, ensuring that it firmly engages with the  
connector.  
I
The SmartExtender  
Modules and not hot-swappable.  
Be sure the hub is powered off  
when installing these modules  
6. If you are sure the module is properly mated with the  
connector, replace the retainer screws to secure the module  
in the expansion slot.  
7. Run corresponding media type between the extender module  
and the target device.  
Connecting Twisted-pair Cabling - For the 100BASE-TX and  
100BASE-T4 modules, prepare Category 5 straight-through  
twisted-pair cables with RJ-45 plugs at both ends. When  
connecting the module directly to an end-node device (e.g., a  
workstation or file server), a bridge or router, run cable from the  
MDI-X port on the SmartExtender Module to the target device.  
However, when connecting the module to a hub or switch,  
Avoid running your cables near  
equipment that may generate  
electromagnetic interference.  
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connect one end of the cable to the MDI port on the extender  
module, and the other end to the MDI-X port on the target  
device (or vice versa). When inserting an RJ-45 plug, be sure  
the tab on the plug clicks into position to ensure that it is  
properly seated. Note that as a general rule, the length of any  
twisted-pair cable should not exceed 100 meters.  
Connecting Fiber Optic Cabling - For the 100BASE-FX module,  
prepare fiber optic cable with SC or ST connectors at both  
ends. When connecting the module directly to an end-node  
device (e.g., workstation or file server), run cable from the Rx  
(Tx) port on the module to the Tx (Rx) port on the target  
device. Also, when daisy-chaining SmartExtender Modules,  
make similar connections between the current module and the  
next device in the stack. When inserting a cable, be sure the tab  
on the plug clicks into position, to ensure that it is properly  
seated. Note that as a general rule, the length of fiber optic  
cable should not exceed 2 kilometers. However, power  
budgeting must be considered when calculating the maximum  
cable length for your specific environment (as described later in  
this chapter).  
Distance Limit and Power Loss in Fiber Optics - When using fiber  
optic cabling, the maximum length between two hubs can be up  
to 2 kilometers. However, you must consider power loss when  
calculating the actual length of cable that can be used with your  
system. You can calculate power loss with the following formula:  
(p dB - i dB)  
m =  
Variable  
Description  
c dB/km  
m
p dB  
i dB  
cable length (kilometers)  
power budget  
intervening devices  
(e.g., patch cables and splices)  
c dB/km  
loss per kilometer of cable  
Table 2.1 Calculating the Power Budget for Fiber Optics  
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Note: To determine the power loss incurred by intervening devices and  
specific cable type, inquire with the manufacturer. The power budget  
depends on the gauge of cable as shown below.  
Gauge of Fiber Cable  
Power Budget  
9.2 dB  
13 dB  
50/125  
62.5/125  
m
m
Table 2.2 Power Budget for Common Guage Fiber Optics  
For a sample calculation, assume the following values:  
• cable gauge - 62.5/125 mm, which means a 13 dB power budget,  
• 2 patch panels along the path, each with 1.5 dB power loss,  
• 1 splice with 1 dB power loss, and  
• inherent power loss in the cable is 4 dB/km  
The maximum cable length is therefore:  
13 dB - 4 dB  
4 dB/km  
m =  
= 2.25 km  
When the 100BASE-FX link is set for the full-duplex  
I
communications (i.e., a dedicated connection), cable length  
should not exceed 2 kilometers. However, when the link is set  
for half-duplex communications (i.e., a shared collision domain),  
cable length should not exceed 412 meters (IEEE 802.3u).  
Note: Even though your calculations for power loss may indicate a longer  
permissible length based on signal strength (as seen in the preceeding  
example), we advise remaining within the recommended limits.  
Maximum Segment Length - In contrast to cascading devices  
through repeater ports, cascading through the SmartExtender  
Module breaks up the collision domain. The number of devices  
that can be cascaded is therefore theoretically unlimited.  
However, in practice, the length of a cascade (even one passing  
through switching ports, as implemented in the extender  
modules) may be limited by the time-out requirements of the  
particular applications running over the network. Considering  
these delay factors, the IEEE 802.1D standard (i.e., RFC for  
MAC bridges) recommends restricting the number of  
interconnection devices between any two nodes to seven.  
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Setting the Communication Mode - The 100BASE-TX and  
100BASE-FX SmartExtender Modules both support half and  
full-duplex communications. The hub uses auto-negotiation to  
determine the transmission mode for any new connection made  
to these modules. However, if a connected device does not also  
support auto-negotiation, and a link cannot be established using  
half duplex (i.e., the last state tested by auto-negotiation), then  
you must manually set the transmission mode for the concerned  
port to full or half duplex via on-board configuration (Chapter  
4) or using optional network management software.  
Bridging Functions - The SmartExtender Modules form a  
separate segment (i.e., collision domain) from the rest of the  
ports in the stack. They therefore provide fully transparent  
bridging functions which automatically learns node addresses  
required to filter and forward traffic based on the destination  
address (i.e., traffic is filtered if the destination address is in the  
local collision domain, or forwarded if the destination is in  
another segment).  
Note: Devices connected to the SmartExtender Module exist in a  
separate segment, and cannot be controlled by a management agent in  
the stack.  
Switching Functions - These modules also provide functions  
commonly found on an Ethernet switch. The scheme used to  
process data packets is automatically adjusted to optimize  
system performance. Fragment-free cut-through or store-and-  
forward processing may be used depending on the current error  
rate. (Refer to Data Switching with the SmartExtender Modules in  
Chapter 1 for a detailed discussion of these processing  
methods.)  
In addition to the features listed above, the extender modules  
also use back pressure to eliminate frame loss when its buffers  
fill, by “slowing” the traffic received from end stations or  
segments connected directly to this port.  
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Interconnecting Stack Segments - Hubs can be completely  
isolated from the stack, or can be attached to any of the three  
available segments embedded in the backplane. When attached  
to a segment (i.e., common collision domian), the hub can  
communicate with all other devices attached to that segment.  
(Refer to the discussion on Mult-Segment Architecture in Chapter 3,  
and to Configuring Hub Parameters in Chapter 4.)  
A Fast EtherHub stack can be split into three separate (isolated)  
segments. The best way to interconnect these different segments  
is to connect a (100BASE-TX) SmartExtender Module to a  
repeater port on a hub in a different segment, using an MDI to  
MDI-X connection. Two extender modules can be used in this  
way to connect all three segments  
SEM  
RJ-45  
SEM  
RJ-45  
SEG3  
SEG1  
SEG2  
You can also make a direct connection between extender  
modules (i.e., similar media types) that exist in two different  
segments in the stack. However, this approach is not only more  
costly, but also entails a slightly higher transit delay for trafffic  
passing between the segments.  
This stack has been fully  
interconnected using two  
extender modules.  
The last alternative is to connect different segments via a Fast  
Ethernet switch or router. Because this is the most expensive  
approach, we do not advise it unless you already have a suitable  
interconnection device available.  
Installing a Backup Power Supply  
If you need to install a backup power module, take these steps:  
1. Remove the face plate on the optional power bay (or a  
previously installed power module) by turning the two  
retaining knobs on the rear panel counterclockwise.  
2. Holding the module level, gently push it all the way into the  
empty bay, ensuring that it firmly engages with the connector.  
3. After you are sure the module is properly seated in the bay,  
tighten the retaining knobs to secure it in place.  
4. Connect power to the backup power supply. Use separate  
AC circuits to provide optimal backup capability.  
Note: Leave at least 12 inches clearance in the back of the hub (or  
stack) to facilitate system maintenance (e.g., removing power modules).  
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Powering on the Hub  
1. Plug one end of the power cord into a power outlet, and the  
other end into the power socket at the rear of the hub (in that  
order for reasons of safety). Then plug in the backup power  
module if you purchased this option. For reliable backup,  
connect the backup power module to a separate AC circuit.  
2. Check the LED indicator marked PWR1 (or PWR2) on the  
front panel to see if it is on. The unit will automatically  
select the setting that matches the connected input voltage.  
Therefore, no additional adjustments are necessary when  
connecting it to any input voltage within the range marked  
on the rear panel.  
3. The hub performs a self-diagnostic test upon power-on.  
(Note that this test takes about 15 seconds to complete.) For  
details about the system self-diagnostic test, refer to the  
following section.  
The unit supports a "hot remove" feature which permits you to  
connect/disconnect network cables without powering off the hub and  
without disrupting the operation of the hubs in stack. However, when  
changing SmartExtender Modules or power supply modules, first  
disconnect power to the concerned hub.  
I
Diagnostic Tests  
Upon power on, the system performs an internal self-diagnostic  
test of major hub components. If any component fails during  
the test, the hub will try to complete the diagnostic procedure.  
Otherwise, the system will hang. For related information, refer  
to Diagnostics Test Indicators in Chapter 5.  
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The following table shows the components to be tested.  
Test Function/Component  
Fast EtherHub-12i  
Boot ROM  
Hub Configuration EEPROM  
Fast EtherHub-12mi  
All tests listed for Fast EtherHub-12i  
and then the following tests:  
Console I/O  
RAM for Repeater Board CPU  
Repeater Information Base SRAM  
Repeater Interface Controller  
Flash ROM for SNMP Firmware  
EEPROM for Stack Configuration  
DRAM Buffer for Management Program  
Management Bus Output Buffer  
Management Bus Input Buffer  
Network Interface Controller  
Routing Table for Internal SEM Port  
Input Queue for Internal SEM Port  
Output Queue for Internal SEM Port  
Routing Table for External SEM Port  
Input Queue for External SEM Port  
Output Queue for External SEM Port  
Table 2.3 Diagnostic Test Functions  
Hot Remove  
The Fast EtherHub 3500 System supports “hot remove”  
capability that allows you to connect/disconnect hubs or media  
connectors from the system with minimal disruption to the  
network. You can remove any network cabling without  
affecting traffic passing across the internal repeater bus.  
However, if the FlexBus 3500 stack cable is disconnected at  
any point in the stack, or is not properly terminated, all Ethernet  
and management traffic passing across the stack’s backplane  
will be disrupted.  
When changing modules in the expansion slot or changing power  
supply modules, first disconnect power to the concerned hub.  
I
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Configuring a Manageable Stack  
To manage the stack with the on-board configuration program  
or any optional network management software, the stack must  
include an EtherHub-12mi (i.e., a unit with an SNMP agent).  
Moreover, the network management station must be able to  
access the segment containing the management agent.  
You should also consider adding a backup SNMP agent to  
provide greater management reliability for critical applications.  
The procedures required to install a backup agent is described  
below.  
Installing an SNMP Backup Agent  
The on-board configuration  
program only provides access  
to the private MIB. To gain full  
SNMP functionality, you must  
use optional network  
Just add the backup agent(s) to the stack and let the system  
automatically choose the Master agent and the Slave agent  
based on longest up-time. The Master indicator on the device  
chosen as the primary agent will turn ON. The Backup indicator  
will turn ON for all other hubs (attached to the same segment)  
that contain SNMP agents.  
management software (e.g.,  
AccView/Open).  
Note: If you attach SNMP agents to separate segments, be sure they  
are assigned unique IP addresses via on-board configuration (as  
described under Changing the Segment Configuration in Chapter 4).  
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Verifying Port Status  
Check each connection by viewing the port status indicators  
listed below. (For a more detailed description on these  
indicators, refer to Chapter 5.)  
LED  
Link  
State  
On  
Blinking  
Blinking  
On  
Indication  
Port has established a valid network connection.  
Traffic is traversing the port.  
Traffic is traversing the port.  
Communications have been set to a speed of 100 Mbps.  
Communications have been set to full-duplex mode.  
Traffic  
Tx/Rx1  
1001  
1
FDX  
On  
1 - The indicators appear on the front of the SmartExtender Module.  
Table 2.4 Checking Key LED Indicators  
If the Link status indicator is not functioning properly, or you  
experience any other difficulties in setting up the switch, refer  
to Appendix A.  
Verifying System Operation  
Verify that all attached devices have a valid connection. The  
hub monitors link status for each port. If any device is properly  
connected to the hub and transmitting a link beat signal, the  
Link indicator lights for the corresponding port. If the Link  
indicator fails to light when you connect a device to the hub,  
check the following items -  
• Be sure the media cable is properly attached to the connected  
device and the hub. Verify that the cable connector snaps  
into place when attached.  
• See if the media cable is functioning properly by using it for  
another port and attached device that displays valid  
indications when connected to the network.  
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• Verify that you have not exceeded the specified limits for any  
attached media type as summarized in the following table:  
Media Type  
Twisted Pair  
Fiber Opitc  
Maximum Length (meters)  
100  
412 (at half duplex)  
2000 (at full duplex)  
Table 2.5 Maximum Cable Length  
• If a computer is attached to the hub, verify that its adapter  
card is functioning properly by trying it in another computer  
that has been successfully connected to the network.  
• When using the 100BASE-TX or 100BASE-FX  
SmartExtender Module, both sides of each connection must  
use the same transmission mode (i.e., full or half duplex). If  
the device connected to the hub operates at full duplex but  
does not support auto-negotiation, then you must manually set  
the transmission mode with the configure button. (Refer to  
section on Communication Mode earlier in this chapter.)  
If you still can’t resolve the problem, please refer to  
Troubleshooting in Appendix A.  
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Chapter 3:  
Setting up Network Connections  
Special Architecture Used for the Fast EtherHub 3500 Stack  
Multi-Segment Architecture  
The Fast EtherHub 3500 system supports multi-segment  
configuration through the FlexBus cabling. Three Ethernet  
segments (i.e., separate collision domains) are embedded in the  
hub’s FlexBus port (i.e., the stack’s backplane). You can  
choose to attach a hub to one of these segments, or to leave it  
isolated except for the management channel. Nodes attached to  
a specific segment (e.g., Segment 1) can only communicate  
with nodes attached to the same segment (unless the segments  
are interconnected with a device such as an Ethernet switch).  
This type of architecture makes the system more flexible,  
provides better traffic load sharing and data protection,  
improves network bandwidth utilization, and simplifies  
troubleshooting.  
Carefully plan your network setup to make this architecture  
work well for your system. Form a common domain for  
devices that need to frequently communicate with each other  
by attaching them to the same segment. In this way you can  
arrange network resources to balance traffic and thereby  
increase overall network efficiency.  
To combine the segments into an interconnected network (while  
at the same time retaining the higher effective bandwidth and  
segment integrity provided by the multi-segment architecture),  
attach each segment to a switch or similar interconnection device,  
such as one of Accton’s Fast Ethernet Switches.  
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FlexBus 3500 Management Link  
The management link in a chain of cascaded hubs must be  
connected to manage the stack as a single unit. This means that  
only hubs connected using the FlexBus can be controlled by an  
SNMP management agent (i.e., Fast EtherHub-12mi). At most, 6  
hubs can be managed and linked together using the FlexBus  
connection.  
Hub ID Setting  
In a stacked system, each hub should have a unique ID number  
to identify itself. Each hub automatically sets an ID number if  
attached to an SNMP management agent through the FlexBus port  
(i.e., Fast EtherHub-12mi). When a new hub is inserted in the  
stack, the next available hub identifier is assigned to the new hub  
(i.e., the identifier numbers are not changed for previously  
configured hubs). When the stack includes a management agent,  
you can also set hub IDs using the on-board configuration  
program. Refer to Configuring Hub Parameters in Chapter 4 for more  
information.  
Using Management Agents  
The Fast EtherHub-12mi SNMP includes an SNMP management  
agent. To add SNMP functionality to the entire stack, this hub  
type must be included in the stack. To provide in-band access to  
the agent you must also attach your network management station  
to a the segment that includes the management agent.  
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Multiple Agents  
The on-board configuration  
program only provides access  
to the private MIB. To gain full  
SNMP functionality, you must  
use optional network  
You may include multiple agents in a stack. To provide a fail-  
safe backup management agent, include it in the same segment  
with the Master agent. You may also use several active agents  
in the same stack. However, they must be attached to different  
segments and have unique IP addresses.  
management software (e.g.,  
AccView/Open).  
SNMP Backup Agent  
The Fast EtherHub 3500 system supports a backup function for  
the management agent. This special function allows the stack to  
have two or more SNMP network management agents attached  
to the same segment, wherein one agent is configured as the  
Master agent and the other(s) as a Slave (i.e., Backup) agent.  
The agent in slave mode behaves as a Fast EtherHub-12i. But if  
the Master agent fails, the Slave agent takes over its functions  
using the latest data mirrored from the Master, including its IP  
address. Note that to manage the stack out-of-band after the  
Slave has assumed control, you must plug your PC or modem  
into the Serial port of the Slave agent. If you are using optional  
network management software, just ensure that your network  
management station can access the new control agent via its  
current network connection.  
Note: Placing redundant agents in a segment will cause the system to  
set the agent with longest up-time as the Master, and the other(s) as a  
slave. If more than one slave exists in a segment, the slave higher up in  
the FlexBus chain will be chosen to function as the Master if it fails.  
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Port Backup Function  
The Fast EtherHub 3500 system supports a port backup  
function (i.e., a redundant link). A hub system can have up to  
18 pairs of redundant links. These links are configurable using  
the in-band or out-of-band management program. When a  
primary link fails, the secondary (i.e., backup) link  
automatically takes over.  
1. To prevent traffic from looping, the primary port is enabled and the  
backup port disabled. If the system is functioning normally, the Link  
indicator for the primary port and the Partition indicator for the  
backup port will be on.  
Notes:  
2. It is common practice to attach these links to the same physical  
device (e.g., two separate adapter cards on a critical server).  
However, to provide more flexibility, this is not enforced by the  
configuration program.  
Security Features  
Intrusion Protection  
Any repeater port on the hub can be configured with a preferred  
source address. If an unauthorized intruder is detected, the  
network management station can be notified, or a trap can be  
sent and the port disabled.  
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Sample Network Configurations  
The Fast EtherHub 3500 series stackable hubs are designed to  
provide flexibility in configuring network connections. This  
hub can be used as a simple stand-alone hub or connected to  
other network interconnection devices in various configurations.  
This section includes sample applications, most of which take  
advantage of the multi-segment architecture. Pay attention to  
the examples that illustrate how to segment a hub stack. This  
procedure can extend network bandwidth up to 300 Mbps.  
Attaching the Stack to One Segment  
You can attach all the hubs in a stacked system to the same  
segment. In this example, a stacked system using the FlexBus  
port connection is connected to segment 1.  
Putting all hubs in the same segment groups all nodes attached  
to the stack in a single collision domain. All Ethernet frames  
transmitted by any node are seen by every other node in the  
stack. For a heavily loaded network, you can significantly  
improve performance by configuring the stack into separate  
segments as shown in the next example.  
EtherHub3500  
SEGMENT 1  
ID1  
ID2  
ID3  
ID4  
ID5  
ID6  
MANAGEMENT  
CHANNEL  
EtherHub3500 HUB  
SEGMENT 1  
SEG. LINK 1  
SEG. LINK 2  
SEG. LINK 3  
EtherHub3500 HUB  
EtherHub3500 HUB  
SEGMENT 1  
SEGMENT 1  
EtherHub3500 HUB  
EtherHub3500 HUB  
SEGMENT 1  
SEGMENT 1  
FlexBus 3500 Cable  
Figure 3-1 Attaching All Hubs in Stack to One Segment  
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Attaching the Stack to Multiple Segments  
This example shows 3 independent Ethernet LANs in a stacked  
system. Hubs 1 and 2 are attached to segment 1, while hubs 3  
and 4 are attached to segment 2, and hubs 5 and 6 are attached  
to segment 3.  
This configuration serves to both balance the network load and  
improve performance. Using three separate segments provides  
300 Mbps of Ethernet bandwidth to the overall stack. Moreover,  
using a segmented configuration serves to confine the effects of  
heavy loading or network problems to a single segment.  
EtherHub3500 AGENT  
ID 1  
SEGMENT 1  
MANAGEMENT  
CHANNEL  
EtherHub3500 HUB  
ID 2  
SEGMENT 1  
SEGMENT 2  
SEGMENT 2  
SEG. LINK 1  
SEG. LINK 2  
SEG. LINK 3  
EtherHub3500 HUB  
EtherHub3500 HUB  
ID 3  
ID 4  
EtherHub3500 HUB  
EtherHub3500 HUB  
ID 5  
ID 6  
SEGMENT 3  
SEGMENT 3  
FlexBus 3500 Cable  
Figure 3-2 Attaching Hubs in Stack to Three Segments  
Traffic in each segment is restricted to that segment and cannot pass  
to another segment without a device such as a SmartExtender Module  
or one of Accton’s Fast Ethernet Switches to link them.  
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Isolating Specific Hub Connections  
You can interconnect or isolate the hubs in a stack using a  
multi-segment configuration. In a stacked system, some hubs  
may be connected to a segment while others are isolated (not  
attached to any segment). In this example, hubs 1 and 2 are  
attached to segment 1, while hubs 3 and 4 are attached to  
segment 2. However, hubs 5 and 6 are not connected to any  
segment. These hubs form isolated segments. With careful  
planning, you can restrict access for specific user groups to  
required connections only.  
EtherHub3500 AGENT  
ID 1  
SEGMENT 1  
MANAGEMENT  
CHANNEL  
EtherHub3500 HUB  
ID 2  
ID 3  
ID 4  
SEGMENT 1  
SEG. LINK 1  
SEG. LINK 2  
SEG. LINK 3  
EtherHub3500 HUB  
EtherHub3500 HUB  
SEGMENT 2  
SEGMENT 2  
EtherHub3500 HUB  
EtherHub3500 HUB  
ISOLATED  
ISOLATED  
ID 5  
ID 6  
FlexBus 3500 Cable  
Figure 3-3 Linking Part of the Stacked Hubs to a Segment  
When hubs are isolated, they cannot communicate with any other  
device in the stack via the FlexBus.  
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Isolating Each Hub  
In this example, each hub in the stack is an independent  
segment (i.e., isolated collision domain). Hubs 2 to 6 are not  
connected to any of the 3 segments embedded in the FlexBus  
3500 cable.  
EtherHub3500 AGENT  
ID 1  
MANAGEMENT  
CHANNEL  
EtherHub3500 HUB  
ID 2  
ID 3  
ID 4  
SEG. LINK 1  
SEG. LINK 2  
SEG. LINK 3  
EtherHub3500 HUB  
EtherHub3500 HUB  
EtherHub3500 HUB  
EtherHub3500 HUB  
ID 5  
ID 6  
FlexBus 3500 Cable  
Figure 3-4 Stacked Hubs Not Linked to a Segment  
If the Fast EtherHub-12mi is isolated from the backplane (i.e., not  
attached to any of the 3 segments), the stack can still be managed  
with the out-of-band configuration program via the management  
channel embedded in the FlexBus 3500 cable.  
F
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Extending the Network with Alternate Connections  
You can extend your network by connecting any of the hubs in  
a stacked system to other compatible hubs via the  
SmartExtender Module. In the diagram below, a stand-alone  
hub is connected to hub 3 in the stacked system using the  
extender module. However, remember that the Fast EtherHub  
3500 Agent can only manage hubs connected to it through the  
FlexBus connection.  
EtherHub3500 AGENT  
ID 1  
SEGMENT 1  
MANAGEMENT  
CHANNEL  
EtherHub3500 HUB  
ID 2  
SEGMENT 1  
SEG. LINK 1  
SEG. LINK 2  
EtherHub3500 HUB  
ID 3  
SEGMENT 2  
SEG. LINK 3  
EtherHub3500 HUB  
ID 4  
SEGMENT 2  
EtherHub3500 HUB  
EtherHub3500 HUB  
ID 5  
ID 6  
SEGMENT 3  
SEGMENT 3  
EtherHub3500  
FlexBus 3500 Cable  
Figure 3-5 Linking Stacked Hubs to Unmanaged Hubs  
via the SmartExtender Module  
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Fast EtherHub 3500 System User’s Guide  
Linking the Stack to a Management Station  
In a stacked system, connect the in-band management workstation  
to the same segment that the management agent is attached to. In  
this example, the management agent is attached to segment 1.  
Thus, the in-band management workstation (e.g., a PC running  
AccView/Open) should also be connected to segment 1.  
EtherHub 3500 AGENT  
SEGMENT 1  
MANAGEMENT  
CHANNEL  
EtherHub3500 HUB  
SEG. LINK 1  
SEG. LINK 2  
SEG. LINK 3  
SEGMENT 1  
EtherHub3500 HUB  
EtherHub3500 HUB  
SEGMENT 2  
SEGMENT 2  
EtherHub3500 HUB  
EtherHub3500 HUB  
SEGMENT 3  
SEGMENT 3  
ACCVIEW  
AccView Station  
(Segment 1)  
FlexBus 3500 Cable  
Figure 3-6 Linking Stacked Hubs to a Network Management Station  
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Interconnecting the Segments  
The 3 segments within a stacked system can be combined into an  
interconnected network using the SmartExtender Modules. For  
example, you can connect all the segments in the stack using just  
two extender modules as shown below. Using this approach, you  
provide a higher bandwidth by using three separate collision  
domains, but still permit stations to communicate with nodes in  
other segments, as required.  
ETHERHUB3500 AGENT  
SEGMENT 1  
ACCVIEW  
ETHERHUB3500 HUB  
SEGMENT 1  
AccView Station  
Inter-Segment Link  
ETHERHUB3500 HUB  
SEGMENT 2  
ETHERHUB3500 HUB  
SEGMENT 2  
Inter-Segment Link  
ETHERHUB3500 HUB  
SEGMENT 3  
FlexBus 3500 Cable  
ETHERHUB3500 HUB  
SEGMENT 3  
Figure 3-7 Linking Segments in a Stacked System  
Setting Up Network Connections  
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Connecting Remote Stacks  
Fast EtherHub stacks can be connected by using the  
SmartExtender Modules. For example, you can connect two  
stacks by running a cable from the extender module in one stack  
to any station port in a remote stack. When using twisted-pair  
cable, the maximum cable length is 100 meters. Also note that  
when you connect directly to a repeater bus in this manner, the  
transmission mode is limited to half duplex.  
You can connect stacks over an even greater distance if you run  
fiber optic cable between SmartExtender Modules in both stacks.  
When you connect to switching ports at both ends of the cable, the  
transmission mode is automatically set to full duplex, allowing  
you can run a fiber optic link up to 2 kilometers. However, if you  
must operate at half duplex, then the maximum separation  
between stacks is 412 meters .  
ETHERHUB3500 HUB  
STACK 1  
ETHERHUB3500 HUB  
STACK 1  
(Up to 100 meters with twisted-pair cable)  
ETHERHUB3500 HUB  
Remote Stack Link  
STACK 2  
ETHERHUB3500 HUB  
STACK 2  
Remote Stack Link  
(Up to 2 kilometers with fiber optic cable)  
ETHERHUB3500 HUB  
STACK 3  
STACK 3  
FlexBus 3500 Cable  
ETHERHUB3500 HUB  
Figure 3-8 Connecting Remote Stacks  
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Fast EtherHub 3500 System User’s Guide  
Operating in the Novell NetWare IPX Environment  
If you’re using Novell NetWare server as your Network  
Operating System, you can have up to 3 LAN adapters installed  
in the File Server. With this type of setup, the network is  
perceived as logically divided into different collision domains,  
but the File Server is still accessible by all nodes. As shown in  
the following figure, three LAN adapters installed in a NetWare  
server are each connected to a hub in the stack with IPX  
Protocol bound to each adapter.  
The first adapter is attached to segment 1 with IPX network  
number 102; the second adapter is attached to segment 2 with  
IPX network number 103; and the third one is connected to  
segment 3 with IPX network number 104.  
EtherHub 3500 Agent  
IPX net number=102  
SEGMENT 1  
SEGMENT 1  
EtherHub 3500 Hub  
SEGMENT 1  
EtherHub 3500 Hub  
IPX net number=103  
SEGMENT 2  
SEGMENT 2  
EtherHub 3500 Hub  
SEGMENT 2  
EtherHub 1500 Hub  
SEGMENT 3  
IPX net number=104  
NOVELL NetWare Server  
EtherHub 1500 Hub  
SEGMENT 3  
SEGMENT 3  
Figure 3-9 System Applied in Novell NetWare IPX Environment  
Setting Up Network Connections  
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Operating in the TCP/IP Environment  
In TCP/IP Internet environment, gateways are used to improve  
performance and regulate network traffic by confining most  
network activity to their respective local network, and still  
maintain communication links among LANs of the same or  
different architectures. You can implement an IP subnet  
gateway if you have an IP network address (e.g., 140.20.0.0).  
For example, in a Fast EtherHub 3500 system (as shown in the  
figure below), you can attach three LAN adapters to your  
subnet gateway using a UNIX server. Perform the following  
steps.  
Assign IP addresses from 140.20.1.1 ~ 140.20.1.254 to nodes on  
segment 1, and set their subnet mask to 255.255.255.0.  
Assign IP addresses from 140.20.2.1 ~ 140.20.2.254 to nodes on  
segment 3, and set their subnet mask to 255.255.255.0.  
Assign IP addresses from 140.20.3.1 ~ 140.20.3.254 to nodes on  
segment 2, and set their subnet mask to 255.255.255.0.  
Assign IP address 140.20.1.10 to the first adapter, 140.20.2.20 to the  
second adapter, and 140.20.3.30 to the third one.  
SEGMENT 1  
EtherHub 3500 Agent  
SEGMENT 1  
EtherHub 3500 Hub  
SEGMENT 1  
IP = 140.20.1.10  
SEGMENT 2  
EtherHub 3500 Hub  
SEGMENT 2  
IP = 140.20.2.20  
EtherHub 3500 Hub  
SEGMENT 2  
IP =140.20.3.30  
SEGMENT 3  
EtherHub 3500 Hub  
SEGMENT 3  
NOVELL NetWare Server,  
Unix Server(e.g., SCO Unix)  
EtherHub 3500 Hub  
SEGMENT 3  
SubnetMask = 255.255.255.0 for all segments  
Figure 3-10 System Applied in TCP/IP Environment  
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Connecting to the Network Backbone  
The stack can be connected to the network backbone by attaching  
it to a device such as a Fast Ethernet switch. The following figure  
shows a direct connection from the stack’s daisy-chain port to a  
100BASE-TX switch which is serving as collapsed network  
backbone.  
ETHERHUB3500 AGENT  
SEGMENT 1  
ACCVIEW  
ETHERHUB3500 HUB  
SEGMENT 1  
AccView Station  
ETHERHUB3500 HUB  
SEGMENT 2  
ETHERHUB3500 HUB  
SEGMENT 2  
ETHERHUB3500 HUB  
SEGMENT 3  
FlexBus 3500 Cable  
ETHERHUB3500 HUB  
SEGMENT 3  
Links to Network  
Fast Ethernet Switch  
Collapsed Backbone  
Figure 3-11 Connecting to the Network Backbone  
Setting Up Network Connections  
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Chapter 4: Configuring the System  
Making the Connections Required for System Configuration  
The Fast EtherHub 3500 series provides a menu-driven  
configuration program. This program can be accessed by  
making a connection to the serial port on the front of the hub  
(using a terminal or a computer running a terminal emulation  
program). Moreover, when configuring the Fast EtherHub-12mi,  
you can Telnet into the hub from any computer attached to the  
network, or call into the hub from a remote computer using a  
modem connection.  
The Fast EtherHub-12mi also provides an on-board  
management program based on Simple Network Management  
Protocol (SNMP). This agent allows you to manage the hub  
(and connected stack) from any PC attached to the network  
with optional in-band network management software (e.g.,  
AccView/Open). This kind of software provides advanced  
management functions using a straight-forward graphical  
interface. You can even use this kind of software to control  
these hubs over a remote modem connection by running SLIP  
protocol over TCP/IP.  
This chapter describes how to perform basic configuration, and  
manage the overall stack, via:  
• Direct connection - making a local connection via the hub’s  
serial port to the on-board menu-driven configuration program.  
• Network connection - Telneting over the network to the on-  
board menu-driven configuration program; or making a  
network connection to the SNMP agent using optional  
network management software (e.g., AccView/Open).  
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• Remote connection - making a modem connection via the  
hub’s serial port to the on-board menu-driven configuration  
program; or using SLIP over TCP/IP from a remote site to  
access the hub with optional network management software.  
Direct Connection  
The Fast EtherHub-12i does not  
include a management agent.  
Configuration options for this  
model are therefore limited to  
direct connection only.  
Moreover, configuration via the  
management port on this model  
is limited to this hub only (i.e.,  
the attached stack cannot be  
managed with this model).  
Attach a VT100 compatible terminal, or a PC running a  
terminal emulation program, to the DB9 serial port on the front  
of any Fast EtherHub 3500 model. Use a null modem connection  
that complies with the wiring assignments provided in  
Appendix B.  
When attaching to a PC, set terminal emulation type to VT100,  
specify the port used by your PC (i.e., COM 1~4), and then set  
communications to 8 data bits, 1 stop bit, no parity, and 9600 bps.  
Set flow control to “none,” and be sure the modem is configured  
F to generate Data Set Ready (DSR) signals.  
The Fast EtherHub-12i can only be managed via a direct connection,  
or via a Fast EtherHub-12mi unit located in the same stack.  
Network Connection  
To access the on-board management agent on the Fast  
EtherHub-12mi, connect a PC to any available port on the  
stacked system. If proper network interconnections are  
available, you can access the management agent from anywhere  
in the attached network. However, if the stack segments are not  
interconnected, you must connect to the segment containing the  
SNMP management agent.  
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Local In-Band Telnet Connection  
Before accessing a hub  
Prior to accessing the hub via an in-band Telnet connection,  
you must first configure it with a valid IP address, subnet mask,  
and default gateway using an out-of-band connection or boot  
protocol. (Refer to Using the Fast EtherHub 3500 Configuration Program  
later in this chapter.) After configuring the hub’s IP parameters,  
you can Telnet into its on-board menu-driven configuration  
program from anywhere within the attached network.  
using a Telnet connection, be  
sure you have already set the  
agent’s IP address via the on-  
board configuration program or  
boot protocol.  
Local In-Band Network Connection  
If you want to use optional network management software (e.g.,  
Accton’s AccView/Open) to configure the Fast EtherHub 3500  
System, then first set up your Network Management Station  
(NMS). The in-band NMS is the personal computer used to run  
your network management software.  
If proper network connections are available, you can access the  
on-board management agent from anywhere in the attached  
network. However, prior to accessing the Fast EtherHub-12mi  
via in-band management software, you must first configure the  
hub with a valid IP address, subnet mask, and default gateway  
using a direct connection or boot protocol.  
Before accessing a hub  
using in-band management  
software, be sure you have  
already set the agent’s IP  
address via the on-board  
configuration program or  
boot protocol.  
Accton provides optional Windows-based network management  
software called AccView/Open. Any PC running the AccView/  
Open program can serve as your in-band network management  
station. You may purchase this package through your Accton  
dealer. Also note that the AccView/Open Fast EtherHub 3500  
Manager module can be easily integrated into most third-party  
management platforms.  
After completing hardware installation, configure the hub using the  
out-of-band program or optional in-band network management  
software (e.g., AccView/Open). Refer to the following sections for  
details on on-board configuration. Refer to the appropriate manual  
for information on optional in-band management software.  
F
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Remote Connection  
If you want to use a remote PC to configure either of the Fast  
EtherHub-12mi models via modem connections, at the remote  
site make sure the modem’s baud rate is 9600 and that the AT  
command set is supported.  
Configuring the Fast EtherHub Site  
Connect your modem and PC  
at the remote site. Dial into the  
management agent, and remotely  
configure the hub using the on-  
board configuration program; or  
directly attach to the network via  
a SLIP connection and perform  
configuration or management  
functions using in-band network  
management software.  
Connect the hub’s DB9 serial port to the modem’s serial port  
using standard serial cabling. (Refer to Appendix B for pin  
assignments). For most modems, which use a 25-pin port, you  
will have to provide an RS232 cable with a 9-pin connector on  
one end and a 25-pin connection on the other end. You do not  
have to set the modem communication parameters at the hub’s  
site, because the hub will automatically configure it to auto-  
answer mode. Just set it to force Data Set Ready (DSR) signals.  
Configuring the Remote Site  
At the remote site, connect the PC’s COM port (COM 1~4) to  
the modem’s serial port. Set terminal emulation type to VT100,  
specify the port used by your PC (i.e., COM 1~4), and then set  
communications to 8 data bits, 1 stop bit, no parity, and 9600 bps.  
Also be sure you set the flow control to “none.”  
Remote Configuration Methods  
Remote On-Board - If you establish a remote connection as  
described in the previous section, you can use the on-board  
management functions on the Fast EtherHub-12mi via a  
terminal emulation program. See the section on Using the Fast  
EtherHub 3500 System Configuration Program later in this chapter for  
more information. However, note that the on-board  
configuration functions only provide access to the hub’s private  
MIB. To access the full range of SNMP management  
functions, you must use optional network management software  
(e.g., AccView/Open).  
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Before accessing a hub using  
in-band management software  
from a remote site, be sure you  
have already set the hub’s serial  
IP address via the on-board  
configuration program or boot  
protocol.  
Remote In-Band - You can also make a remote network  
connection to the Fast EtherHub-12mi via the serial port using  
SLIP protocol over TCP/IP. Using this kind of connection, you  
can manage the hub or other attached network devices using in-  
band network management software. Note that the system  
functions similar to a router when you use IP protocol over a  
SLIP link to the serial port, providing direct access to all  
attached network resources (depending on your assigned user  
privileges).  
Note: The winsocket used by both Windows 95 and Windows NT  
include the SLIP protocol.  
Accessing the Configuration Management Program  
There are two methods for configuring the EtherHub 3500  
system - using the on-board configuration program, or using  
network management software (e.g., AccView/Open). Contact  
your Accton dealer for more information on AccView/Open.  
Configuring Your System with the On-board Program  
On-board configuration requires a terminal or a computer  
running a terminal emulation program as your working  
platform. There are three valid connection types to the hub:  
• Onsite connection  
The workstation, normally within the vicinity of the hub, is  
directly connected to the serial port on the hub.  
• Telnet connection  
The workstation is connected to a remote Fast EtherHub  
3500 hub via a networked Telnet connection.  
• Modem connection  
The workstation is connected to a remote Fast EtherHub  
3500 hub via modems.  
Configuring the System  
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The physical setup and connections required for on-board  
management are described in greater detail at the beginning of  
this chapter. To open the Fast EtherHub 3500 System  
Configuration Program, do the following:  
1. Activate the Fast EtherHub 3500 System Configuration  
Program from a local console, via Telnet, or via modem  
connection as described below.  
From a local console -  
Be sure you have already run a cable from your terminal or  
PC’s Com port to the serial port on the target hub as described  
earlier in this chapter. When connecting a PC to the hub, use  
a terminal emulation package to connect to the specific Com  
port that is attached to the hub. Configure the connection for  
9600 baud, 8 data bits, no parity bits, 1 stop bit, and no flow  
control. Also be sure the modem is configured to force DSR  
signals. Then open the connection.  
From a telnet connection -  
Telnet into the target hub using its assigned IP address.  
From a remote modem connection -  
When telneting into the hub, be  
sure the telnet application has  
disabled Windows cursor control.  
If you are using Microsoft Telnet,  
this can be accomplished by  
selecting “VT100 Arrows” from the  
Terminal Options menu.  
Be sure you have attached a modem to both your local PC  
and the remote hub as described earlier in this chapter. Use  
a terminal emulation package to connect to the Com port  
that is attached to the modem. Configure the connection for  
9600 baud, 8 data bits, no parity bits, and 1 stop bit. Then  
dial in to the hub.  
If the screen is blank, press the <Enter>key several times  
until the the login screen appears. If diagnostic messages  
indicate a failure, refer to Troubleshooting in Appendix A.  
Once the connection has been properly established, the login  
screen for the on-board configuration program should appear.  
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2. The login procedure for the Fast EtherHub-12i configuration  
program requires a password only. Access priviledges are  
Read/Write, and the default password is “admin.”  
When logging into the Fast EtherHub-12mi configuration  
program, you must provide both a user name and password.  
The default user names are “admin” and “guest.” The  
Administrator account has read/write access, and the Guest  
has read-only access. For initial configurations, the  
password is blank. Just press the <Enter>key.  
Administrator is the highest privilege level in the Fast  
EtherHub-12mi configuration program. The administrator  
should define a password, record it and put it in a safe place.  
If you have not already done so, select the User Passwords  
field under the Configuration Panel and enter a password.  
The configuration parameters you can access after logging  
into the system are described in the following section.  
Using the Fast EtherHub 3500 System Configuration Program  
Accton provides a proprietary, user-friendly, menu driven on-  
board configuration program (i.e., the Fast EtherHub 3500  
System Configuration Program). The configuration program  
differs for the Fast EtherHub-12i and the Fast EtherHub-12mi.  
The connection types allowed and options provided by this  
configuration program are summarized below:  
• The Fast EtherHub-12i is designed as a manageable hub,  
without an on-board SNMP agent. Therefore, when an  
SNMP agent (i.e., the Fast EtherHub-12mi) is connected to  
this hub via the backplane bus, its management port will be  
disabled, and configuration must be carried out using the  
agent. However, if this hub is not connected to an agent, you  
can configure it by making a direct connection to the  
management port.  
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• When configuring a Fast EtherHub-12mi or the connected  
stack, you can use a direct connection to the managment  
port, use a Telnet connection from a networked computer, or  
use a standard modem connection from a remote computer.  
System Configuration Program for the Fast EtherHub-12i  
With this program you can carry out basic configuration on  
the attached hub, such as setting the hub ID, connecting to the  
required backplane segment, or configuring the SmartExtender  
Module. Set up a direct connection to the hub, and enter the  
password “admin” (if you have not yet changed the password).  
The following menu will be displayed after logging on.  
**************************************************  
*
Accton Fast EtherHub-12i  
*
**************************************************  
Status  
-------  
Hub ID  
Segment  
Isolate  
: 1  
: 1  
: OFF  
Command  
-------------  
h = Set hub ID  
s = Set segment  
e = Set SEM status  
c = Change password  
w = Write values into EEPROM  
i = Change isolation status  
q = Exit  
Enter command :  
Figure 4-1 Main Configuration Menu (12i only)  
Note: Input options for the selected item are displayed at the bottom of  
the interface screen.  
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Menu selections are briefly described in the following table.  
Field  
Description  
Command Set hub ID  
Press “h” to set the hub identifier to any value from 1 ~ 6. When stacked with  
a management agent, note that all hub identifiers are automatically configured.  
Press “s” to attach the hub to backplane segment 1 ~ 3.  
Set Segment  
Set SEM status  
Press “e” to display the menu for the SmartExtender Module. Refer to the  
following table for a description of the configuration options for this module.  
Press “c” to change the password. Passwords can be up to 5 characters long  
and are case sensitive.  
Change password  
Write values to EEPROM Press “w” to write all configuration changes to nonvolatile memory. You must  
save your changes, or they will be lost the next time you restart the system.  
Change isolation status  
Exit  
You can isolate the hub from the backplane, or reattach it to the backplane.  
Press “q” to quit the cofiguration menu and return to the command prompt.  
Table 4.1 Configuration Options in Main Menu (12i only)  
Configuring the SmartExtender Module  
To configure the SmartExtender Module, press “e”. The  
following menu will be displayed.  
***********************************************  
*
Accton Fast EtherHub-12i  
*
***********************************************  
SEM Status  
----------  
Duplex : negotiated full-duplex  
Forward : adaptive cut-through  
Back Pressure : disable  
===============================  
Command  
-------  
d = Set duplex mode  
m = Set forward mode  
b = Set back pressure  
r = Return to Main Menu  
Enter command :  
Figure 4-2 Configuration Menu for SmartExtender Module (12i only)  
Note: Input options for the selected item are displayed at the bottom of  
the interface screen.  
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The current settings for the extender module are displayed in  
the status field. Menu selections are briefly described in the  
following table.  
Field  
Description  
Command Set duplex  
Press “d” to set the transmission mode to half-duplex, full-duplex or auto-  
negotiation. All Fast EtherHubs are set to auto-negotiation when powered up.  
Any changes to transmission mode will be lost if the power to the hub is reset.  
Press “f” to set the frame forwarding mode to adaptive cut-through or store &  
forward.  
Set forward mode  
Set back pressure  
Press “b” to enable or disable back pressure.  
Return to Main Menu  
Press “r” to return to the Main Menu.  
Table 4.2 Configuration Options for SmartExtender Module (12i only)  
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System Configuration Program for the Fast EtherHub-12mi and Stack  
With this program you can define system parameters, manage  
and control stacked hubs and associated ports, and monitor  
network conditions. Set up a management connection to the  
hub, and enter a user name and password. User names are  
“admin” (read/write access) or “guest” (read access). No  
password is configured for the default configuration. The  
following menu will be displayed after logging on.  
Main Menu  
=========  
Exit  
Restart System  
System Information ...  
Configuration Panels:  
SNMP Configuration ...  
Segment Configuration ...  
Hub Configuration ...  
Port Configuration ...  
Port Backups ...  
Port Intrusion Control ...  
TFTP Download ...  
Xmodem Download ...  
User Passwords ...  
Console Lockout ...  
Statistics Panels:  
Segment Statistics ...  
Hub Statistics ...  
Port Statistics ...  
Exit this User Interface program.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+E> to exit this program.  
Figure 4-3 Main Configuration Menu  
Note: Input options for the selected item are displayed at the bottom of  
the interface screen. For items which require you to choose an option,  
follow your input by pressing the [Enter] key. Use <Ctrl+L> to scroll  
through an options list, <Ctrl+T> to move to an upper level menu, or  
<Ctrl+E> to close the configuration program.  
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To select a configuration item, use the arrow keys to position  
the cursor (i.e., the highlighted box), and then press the [Enter]  
key. Configuration items followed by dots (...) open up another  
menu screen. Menu selections are briefly described in the  
following table.  
Field  
Exit  
Restart System  
Description  
Exits the program and returns to the operating system.  
Restarts the on-board management agent.  
Identifies the system.  
Main  
System Information  
Configuration SNMP Configuration  
Configures communities, as well as IP and IPX trap managers.  
Segment Configuration Configures IP, IPX and SNMP parameters for each segment.  
Hub Configuration  
Isolates/attaches a hub, or sets the hub’s segment;  
defines attached segment for Network Management Module, and sets bootup option;  
also sets protocol status for SNMP/IP, SNMP/IPX and SNMP/Ethernet.  
Disables/enables a port, shows link and partition state, as well as allowing you to  
set the communication mode to full or half-duplex for the SmartExtender Module.  
Sets up to 18 pairs of backup ports. Each pair contains a master and slave port.  
The slave port is normally disabled. When master port fails, the system disables  
the master port and enables the slave port to maintain the link.  
Sets the authorized entry address, and defines response for detected intrusion.  
Downloads new version of firmware to update your system (via in-band).  
Downloads new version of firmware to update your system (via on-board program).  
Defines password for administrator and guest.  
Port Configuration  
Port Backups  
Port Intrusion Control  
TFTP Download  
Xmodem Download  
User Passwords  
Console Lockout  
Sets the time the system will wait without receiving any keyboard input before  
logging you off the configuration program.  
Statistics  
Segment Statistics  
Hub Statistics  
Displays network performance for each hub segment.  
Displays network performance for each hub.  
Port Statistics  
Displays network performance for each port.  
Table 4.3 Main Configuration Menu  
Exiting the Configuration Program  
Use the Exit command under the Main Menu to close the  
configuration program. Note that this command and <Ctrl+E>  
have the same effect.  
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Restarting the Agent  
Use the Restart System command under the Main Menu to reset  
the agent and all devices managed by the agent. The hardware  
configuration for the agent and system tests are displayed on  
the management console, similar to the messages shown in the  
following example.  
SYSTEM CONFIGURATION:  
---------------------  
EPROM size: 128KB (configured)  
Flash ROM size: 512KB  
EEPROM size: 8KB  
DRAM size: 4MB  
no SRAM detected  
SRAM size: 0KB  
Input FIFO: 1024 bytes  
Output FIFO: 1024 bytes  
SYSTEM TESTS:  
-------------  
Console I/O test...  
!"#$%&’()*+,-  
./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ  
[\]^_‘abcdefghijklmnopqrstuvwxyz{|}~  
Flash ROM test...  
Checksum test passed  
EEPROM header test...  
Checksum test passed  
DRAM test...  
Address ripple test passed  
Walking 0 test passed  
Walking 1 test passed  
Refresh test passed  
SRAM test...  
No SRAM detected  
Output FIFO testing OK ! SIZE 1024 bytes  
Input FIFO testing OK ! SIZE 1024 bytes  
SYSTEM TESTS COMPLETED  
----------------------  
Figure 4-4 Screen Messages for System Resart  
Configuring the System  
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Displaying System Information  
Use the System Information command to display and modify  
general information about the EtherHub stack, or for quick  
system identification. View a description of the system similar  
to that displayed in the following example:  
System Information  
Return to Previous Panel  
System Description : Accton Fast EtherHub 3500 System  
System Object ID : 1.3.6.1.4.1.2.6.37  
System Up Time : 602343 (0 day 1 hr 40 min 23 sec)  
System Name  
Contact  
: R&D Stack  
: Mark Spitz  
: 2nd floor  
Location  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-5 System Information Menu  
Menu items are briefly described in the following table.  
Field  
Description  
System Description Model name of the EtherHub unit  
System Object ID Object identifier as defined in MIB II  
System Up Time  
System Name  
Contact  
Length of time the EtherHub management agent has been running  
Name assigned to the EtherHub system  
Contact person for the system  
Location  
Specifies area or location where the system is located  
Table 4.4 System Information Menu  
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Configuring the SNMP Agent  
When using SNMP-based network management software (e.g.,  
the optional AccView/Open package), you must specify basic  
parameters that control management access to the system. Use  
the SNMP Configuration menu to display the following screen:  
parameters:  
SNMP Configuration  
Return to Previous Panel  
Send Authentication Fail Trap : YES  
SNMP Communities ...  
IP Trap Managers ...  
IPX Trap Managers ...  
Display or work with IPX trap managers.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-6 SNMP Configuration Menu  
Menu items are briefly described in the following table.  
Description  
Field  
Send Authentication Fail Trap Issue a trap message if anyone attempts to access the configuration program without  
the proper user name and password.  
SNMP Communities  
The community strings authorized for SNMP or trap management access. All  
community strings used for IP and IPX Trap Managers must be listed in this table.  
IP management stations selected to receive trap messages from the system.  
IPX management stations selected to receive trap messages from the system.  
IP Trap Managers  
IPX Trap Managers  
Table 4.5 SNMP Configuration Menu  
Configuring the System  
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Configuring SNMP Communities  
Access to the hub’s on-board management agent via in-band  
management software is controlled with community strings.  
Use the SNMP Communities command to edit community  
strings and access rights as shown below:  
SNMP Communities  
Return to Previous Panel  
Community Name  
1. public  
Access  
Status  
READ ONLY  
READ/WRITE  
READ ONLY  
READ ONLY  
READ ONLY  
ENABLED  
ENABLED  
DISABLED  
DISABLED  
DISABLED  
2. xray  
3.  
4.  
5.  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-7 SNMP Communities Menu  
Menu items are briefly described in the following table.  
Field  
Description  
Community Name A community entry authorized for management access.  
Access  
Status  
Management access is restricted to Read Only or Read/Write.  
The current entry can be ENABLED or DISABLED.  
Table 4.6 SNMP Communities Menu  
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Configuring IP Trap Managers  
When the hub experiences an unusual event, a message is  
issued to all listed network managers. Networks compliant  
with Internet Protocol (IP) can pass trap messages to IP Trap  
Managers as shown below:  
IP Trap Managers  
Return to Previous Panel  
IP Address  
Community Name  
Status  
1. 203.70.236.106  
2. 0.0.0.0  
3. 0.0.0.0  
4. 0.0.0.0  
5. 0.0.0.0  
public  
public  
public  
public  
public  
ENABLED  
DISABLED  
DISABLED  
DISABLED  
DISABLED  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-8 IP Trap Managers Menu  
Menu items are briefly described in the following table.  
Field  
Description  
IP Address  
IP address of the trap receiver. (Use dotted decimal notation.)  
Community Name The community string required for trap access.  
Status  
The current entry can be ENABLED or DISABLED.  
Table 4.7 IP Trap Managers Menu  
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Configuring IPX Trap Managers  
When the hub experiences an unusual event, a message is  
issued to all listed network managers. Networks compliant  
with Internetwork Packet Exchange (NetWare IPX) protocol  
can pass trap messages to IPX Trap Managers as shown below:  
IPX Trap Managers  
Return to Previous Panel  
IPX Address  
Community Name  
Status  
1. 00-00-13-52:00-00-00-00-E8-90  
2. 00-00-00-00:00-00-00-00-00-00  
3. 00-00-00-00:00-00-00-00-00-00  
4. 00-00-00-00:00-00-00-00-00-00  
5. 00-00-00-00:00-00-00-00-00-00  
public  
public  
public  
public  
public  
ENABLED  
DISABLED  
DISABLED  
DISABLED  
DISABLED  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-9 IPX Trap Managers Menu  
Menu items are briefly described in the following table.  
Field  
IPX Address  
Description  
IPX address of the trap receiver. (Provide dotted decimal notation with both the network and MAC  
address components.)  
Community Name The community string required for trap management access.  
Status  
The status of the current entry can be set to ENABLED or DISABLED.  
Table 4.8 IPX Trap Managers Menu  
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Changing the Segment Configuration  
When accessing the EtherHub system with in-band tools such  
as SNMP, Telnet or TFTP, you must configure the hub to use  
IP, IPX or SNMP over Ethernet protocols. Use the Segment  
Configuration menu to display the following screen:  
Segment Configuration  
Return to Previous Panel  
Segment Name  
Segment 1  
: R&D  
Segment 2  
Segment 3  
IP Configuration :  
IP Address  
Subnet Mask  
Gateway IP  
Serial IP  
: 203.70.236.1  
203.70.236.2  
255.255.255.0  
0.0.0.0  
203.70.236.3  
255.255.255.0  
0.0.0.0  
: 255.255.255.0  
: 203.70.236.254  
: 203.70.236.9  
0.0.0.0  
0.0.0.0  
Save to EEPROM  
Save to EEPROM  
Save to EEPROM  
IPX Frame Type  
Internal IPX Network  
: IPX 802.2 FRAME IPX 802.2 FRAME  
IPX 802.2 FRAME  
AC-B3-00-56  
: AC-B3-00-56  
AC-B3-00-56  
IP Protocol  
IPX Protocol  
SNMP Over Ethernet  
: ENABLED  
: DISABLED  
: DISABLED  
ENABLED  
DISABLED  
DISABLED  
ENABLED  
DISABLED  
DISABLED  
IP configuration of segment 1 saved to EEPROM and enabled!  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-10 Segment Configuration Menu  
Configuring the System  
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Menu items are briefly described in the following table.  
Field  
Segment Name  
IP Configuration  
Description  
A name you can assign to the segment.  
The hub system may be run on SNMP protocol over UDP/IP transport protocol. In this  
environment, all systems on the Internet, such as network interconnection devices and  
Network Management Stations (e.g., the PC running AccView) are assigned an IP address.  
When accessing the hub from a remote site, you will also have to assign an IP address to  
the management port.  
IP Address  
IP address of the segment you’re managing.  
Subnet Mask  
Subnet mask of the agent you’ve selected. This mask identifies the host address bits used  
for routing to specific subnets.  
Gateway IP  
Serial IP  
Gateway used in passing trap messages from the hub agent to the management station.  
IP address used to access the on-board configuration program via an out-of-band SLIP  
connection to the management port.  
Save to EEPROM  
IPX Frame Type  
This command saves the IP address for the selected segment in nonvolatile memory, and  
makes it effective immediately.  
The selected format used on the LAN; i.e., this type is that used by the IPX network where  
the hub is installed. If the specified frame type is not detected, the hub will automatically  
detect the current type. (Values: 802.3, Ethernet II, SNAP, 802.2)  
This address is composed of Net Number which identifies the IPX network number for the  
connected slot.  
Internal IPX Network  
IP Protocol  
IPX Protocol  
SNMP over Ethernet  
Protocol suite selection.  
Protocol suite selection.  
Protocol suite selection.  
Table 4.9 Segment Configuration Menu  
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Configuring Hub Parameters  
Use the Hub Configuration menu under the Configuration  
Panel to configure any hub in the stack. This menu is used to  
configure the repeater and management modules. Use the  
following menu to select the required hub, or to change the  
numeric identifier for any hub in stack.  
Hub Configuration: Hub Selection Menu  
Return to Previous Panel  
Hub 1 Configuration ...  
Hub 2 Configuration ...  
Hub 3 Configuration ...  
Hub 4 Configuration ...  
Hub 5 Configuration ...  
Hub 6 Configuration ...  
Hub ID Configuration ...  
Display or work with hub ID configuration.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-11 Hub Configuration: Hub Selection Menu  
Configuring the System  
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Hub Configuration  
To configure a hub, select it from the list shown above. The  
following Hub Configuration menu will appear, allowing you to  
set parameters for the base repeater unit or the network  
management module.  
Hub Configuration  
Return to Previous Panel  
Hub ID  
Name  
: 1  
Position : 1  
: H/W Group  
Type  
: EH3512M-TX  
Segment : 1  
H/W Ver : 0  
F/W Ver : 1.05  
Status  
: ATTACHED  
Power 1 : OPERATIONAL  
Power 2 : NOT PRESENT  
Network Management Module (NMM) :  
Status  
: PRIMARY  
H/W Ver : 4  
Segment : 1  
F/W Ver : 1.09  
Bootup Option : NORMAL  
Physical Address : 00-04-AC-B3-00-31  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-12 Hub Configuration Menu  
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Menu items are briefly described in the following table.  
Board  
Field  
Description  
(Repeater Unit) Hub ID  
Hub identifier within the stack. (Up to 6 hubs may be connected via the FlexBus  
management channel.)  
Name  
Any user-defined name for the selected hub.  
Status  
Segment  
The hub may be isolated from the backplane or attached to the backplane.  
Attach the hub to a specified segment (1 ~ 3). The segment indicator will light up to  
show that it has been connected to the specified stack segment.  
Shows status of power module in Slot 1 as Operational, Not Present, or Failed.  
Shows status of power module in Slot 2 as Operational, Not Present, or Failed.  
The physical position in the stack.  
Power 1  
Power 2  
Position  
Type  
Indicates hub type as EH3512I-TX or EH3512M-TX.  
H/W Ver  
F/W Ver  
Indicates the current hardware version number of the repeater board.  
Indicates the current firmware version number of the repeater board.  
Network  
Management  
Status  
Segment  
Defines the status of the Network Management Module as Primary or Backup.  
The backplane segment the NMM is attached to. Note that the management agent  
does not have to be attached to the same segment as the repeater unit.  
Specifies bootup method as -  
Module (NMM) Bootup Option  
NORMAL - Use on-board ROM code and default IP address.  
TFTP DOWNLOAD - Get system code from TFTP server (and use default IP  
address).  
BOOTP GET IP - Get IP address from server (and use on-board ROM code).  
BOOTP DOWNLOAD - Get IP address and system code from server. Image is  
stored in temporary memory.  
NO BOOTP TFTP REQUEST - Do not issue BOOTP request. Wait for download  
via out-of-band.  
BOOTP UPGRADE FIRMWARE - Get IP address and system code from server.  
Image is stored in nonvolatile memory, and BOOTP option reset to NORMAL. Note  
that this is the only in-band option that places the image in nonvolatile memory.  
Indicates the current hardware version number for the managment board.  
Indicates the current firmware version number for the managment board.  
H/W Ver  
F/W Ver  
Physical Address MAC address of the management agent.  
Table 4.10 Hub Configuration Menu  
Configuring the System  
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Hub ID Configuration  
To change the numeric hub identifier, select Hub ID  
Configuration from the Hub Configuration: Hub Selection  
Menu shown above. The following Hub ID Configuration  
menu will appear. After changing a hub identifier, verify the  
change with the “Enable Above Settings” command.  
Hub ID Configuration  
Return to Previous Panel  
Position Hub ID  
1.  
2.  
3.  
4.  
5.  
6.  
1
2
3
4
5
6
Enable Above Settings  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-13 Hub ID Configuration Menu  
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Configuring Port Parameters  
Use the Port Configuration menu under the Configuration  
Panel to configure the ports for any hub in the stack. Select the  
port type for the required hub from the following menu.  
Port Configuration: Port Selection Menu  
Return to Previous Panel  
Select port to get configuration  
Hub ID |  
Port ID  
----------+------------------------  
1
2
3
4
5
6
| 1 through 12 SEM  
| 1 through 12 SEM  
| 1 through 12 SEM  
| 1 through 12 SEM  
| 1 through 12 SEM  
| 1 through 12 SEM  
Display or work with hub 1 ports 1 through 12 configuration.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-14 Port Configuration: Port Selection Menu  
Configuring the System  
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Configuring Repeater Ports  
If you select the repeater port type (i.e., 1 through 12), the Port  
Configuration Menu will open. This menu displays the ID and  
stack position of the selected hub, and also allows you to  
enable/disable any repeater port in the selected hub.  
Port Configuration  
Return to Previous Panel  
Position : 1  
Hub ID : 1  
Port ID Name  
Type  
Admin Status Oper Status Link State  
Partition  
1.  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
9.  
100BASE-TX ENABLED ENABLED DOWN  
100BASE-TX ENABLED DISABLED DOWN  
100BASE-TX ENABLED ENABLED DOWN  
100BASE-TX ENABLED ENABLED DOWN  
100BASE-TX ENABLED ENABLED DOWN  
100BASE-TX ENABLED ENABLED DOWN  
100BASE-TX ENABLED ENABLED DOWN  
100BASE-TX ENABLED ENABLED DOWN  
100BASE-TX ENABLED ENABLED DOWN  
NOT PART  
NOT PART  
NOT PART  
NOT PART  
NOT PART  
NOT PART  
NOT PART  
NOT PART  
NOT PART  
NOT PART  
NOT PART  
NOT PART  
10.  
11.  
12.  
Steve 100BASE-TX ENABLED ENABLED UP  
100BASE-TX ENABLED ENABLED DOWN  
100BASE-TX ENABLED ENABLED DOWN  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-15 Port Configuration Menu  
Menu items are briefly described in the following table.  
Field  
Hub ID  
Description  
Hub identifier within the stack.  
Position  
Port ID  
Name  
Type  
The physical position in the stack (as determined by its position from the top of the FlexBus chain).  
Numeric identifier 1~12 or SEM (i.e., SmartExtender Module).  
User-defined name for selected port.  
Connection type for the repeater Ports 1~12 is 100BASE-TX.  
Any port may be set by the operator to ENABLED or DISABLED.  
Reflects the port’s actual status as ENABLED or DISABLED.  
Indicates if the port has a valid connection to an external device.  
Indicates if the port is partitioned. (Refer to Partition/Disable Indicators in Chapter 5 for a more  
detailed description of the reasons a port may be partitioned.)  
Admin Status1  
Oper Status1  
Link State  
Partition  
1 - If the port is set to ENABLED by the administrator, but used as a backup port, Admin Status and Oper Status will differ.  
Table 4.11 Port Configuration Menu  
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Configuring the SmartExtender Module  
If you select the SmartExtender Module (i.e., SEM), the SEM  
Port Configuration Menu will open. This menu allows you to  
configure various communication parameters for this module.  
SEM Port Configuration  
Return to Previous Panel  
Hub ID : 1  
Position : 1  
Port ID : SEM  
Name  
: Uplink  
Link State  
Speed  
: UP  
Type  
: 100BASE-TX  
: 10M  
Admin Status : ENABLED  
Duplex Mode : HALF-DUPLEX  
Back Pressure : DISABLED  
Oper Status  
: ENABLED  
Duplex In Use : HALF-DUPLEX  
Forwarding Mode : STORE AND FORWARD  
Forwarding In Use : STORE AND FORWARD  
Return to previous panel.  
Use arrow keys to move. <Enter> to make changes.  
<Ctrl+T> to return to Main Menu.  
Figure 4-16 SEM Port Configuration Menu  
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Menu items are briefly described in the following table.  
Field  
Hub ID  
Description  
Hub identifier within the stack.  
Position  
Port ID  
Name  
The physical position in the stack (as determined by its position from the top of the FlexBus chain).  
Identifies this port as the SmartExtender Module.  
User-defined name for selected port.  
Link State  
Type  
Indicates if the port has a valid connection to an external device.  
Connection types for the SmartExtender Module include 100BASE-TX (10BASE-T), 100BASE-T4,  
100BASE-FX.  
Speed  
The 100BASE-TX module relies on auto-detection to set the speed at 10 or 100 Mbps, while the  
100BASE-T4 and 100BASE-FX modules are fixed at 100 Mbps.  
Any port may be set by the operator to ENABLED or DISABLED.  
Reflects the port’s actual status as ENABLED or DISABLED.  
The extender module for 100BASE-TX (10BASE-T) and 100BASE-FX can be set to half or full duplex.  
Displays the actual duplex mode in use based on the results of auto-negotiation.  
When the internal buffers on this port begin to fill, it can be configured to signal the connected  
device to slow transmission by setting this field to ENABLED.  
Admin Status1  
Oper Status1  
Duplex Mode  
Duplex In Use  
Back Pressure  
Forwarding Mode The scheme by which frames are processed and forwarded through this module can be set to  
Adaptive Cut-through or Store and Forward.  
Forwarding In Use Indicates the actual forwarding mode in use based on the current error rate.  
1 - If the port is set to ENABLED by the administrator, but used as a backup port, Admin Status and Oper Status will differ.  
Table 4.12 SEM Port Configuration Menu  
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Defining Backup Ports  
Use the Port Backups menu under the Configuration Panel to  
define up to 6 master/slave port pairs. If the connection to the  
master port fails, the slave port will automatically take over.  
For greater reliability, primary and secondary ports should be  
located on different hubs. Use the following menu to specify  
and activate port backup pairs.  
Port Backups  
Return to Previous Panel  
Backup Set  
Primary Port  
Secondary Port  
Action  
1.  
2.  
3.  
4.  
5.  
6.  
Hub: 1 Port: 1  
Hub: 1 Port: 4  
Hub: 1 Port: 1  
Hub: 1 Port: 1  
Hub: 1 Port: 1  
Hub: 1 Port: 2  
Hub: 1 Port: 1 INACTIVE  
Hub: 1 Port: 1 INACTIVE  
Hub: 1 Port: 1 INACTIVE  
Hub: 1 Port: 1 INACTIVE  
Hub: 1 Port: 2 INACTIVE  
Hub: 1 Port: 1 INACTIVE  
Return to previous panel.  
Use arrow keys to move. <Enter> to make changes.  
<Ctrl+T> to return to Main Menu.  
Figure 4-17 Port Backups Menu  
Menu items are briefly described in the following table.  
Description  
Field  
Backup Set  
Primary Port  
Hub  
Identifier for up to 18 backup port pairs.  
Pair member serving as the primary link.  
Hub ID for the master port.  
Port  
Port identifier for the master port.  
Secondary Port Pair member serving as the backup link.  
Hub  
Port  
Hub ID for the slave port.  
Port identifier for the slave port.  
Action  
Each backup pair can be set to ACTIVE or INACTIVE.  
BACKUP is displayed if the primary port is not currently linked.  
STAND-BY is displayed if the backup port is not currently linked.  
Table 4.13 Port Backups Menu  
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Port Intrusion Control  
Use the Port Intrusion Control menu under the Configuration  
Panel to restrict access for any port to an authorized source  
address. Select the required hub from the following menu.  
Port Intrusion Control: Hub Selection Menu  
Return to Previous Panel  
Hub 1 Port Intrusion Control ...  
Hub 2 Port Intrusion Control ...  
Hub 3 Port Intrusion Control ...  
Hub 4 Port Intrusion Control ...  
Hub 5 Port Intrusion Control ...  
Hub 6 Port Intrusion Control ...  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-18 Port Intrusion Control: Hub Selection Menu  
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Use the Port Intrusion Control Menu to define the MAC  
address for the device authorized to access a port, and set the  
response type, as shown in the following example.  
Port Intrusion Control  
Return to Previous Panel  
Hub ID : 1  
Position : 1  
Port ID Authorized Address Intrusion Action  
1.  
2.  
3.  
4.  
5.  
6.  
7.  
8.  
9.  
00-00-00-00-00-00  
00-00-00-00-00-00  
00-00-00-00-00-00  
00-00-00-00-00-00  
00-00-00-00-00-00  
00-00-00-00-00-00  
00-00-00-00-00-00  
00-00-00-00-00-00  
00-00-00-00-00-00  
INACTIVE  
INACTIVE  
INACTIVE  
INACTIVE  
INACTIVE  
INACTIVE  
INACTIVE  
INACTIVE  
INACTIVE  
10.  
11.  
12.  
00-00-E8-90-1B-73 WARNING & DISABLE  
00-00-00-00-00-00  
00-00-00-00-00-00  
INACTIVE  
INACTIVE  
Return to previous panel.  
Use arrow keys to move. <Enter> to make changes.  
<Ctrl+T> to return to Main Menu.  
Figure 4-19 Port Intrusion Control Menu  
Menu items are briefly described in the following table.  
Description  
Field  
Hub ID  
Hub identifier within the stack.  
Position  
Port  
The physical position in the stack (as determined by its position from the top of the FlexBus chain).  
Selects any station port (1~12) on the hub.  
Authorized Address Defines the MAC address that is authorized to attach to this port.  
Intrusion Action  
Response to a detected intrusion can be set to:  
INACTIVE - no action taken,  
WARNING - trap message is issued to the management station, or  
WARNING & DISABLE - trap message is issued and port is disabled.  
Note: If a port is disabled by an unauthorized intrusion attempt, it must be manually re-enabled  
using the Oper Status field in the Port Configuration menu.  
Table 4.14 Port Intrusion Control Menu  
Configuring the System  
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Downloading System Software via a TFTP Server  
Use the TFTP Download command under the Configuration  
Panel to download firmware updates into the hub. You may  
upgrade firmware from a server attached to the local network,  
or remotely via a serial link using TFTP over SLIP.  
Specify the IP address for the TFTP server, the filename, and  
the download mode. The download file should be a binary file  
from Accton; otherwise the agent will not accept it. Also be  
sure that you have already set the required bootup option for the  
target hub under the Hub Configuration menu.  
Download status is indicated by messages at the bottom of the  
screen. Firmware is first loaded into a temporary buffer. If you  
selected download for permanent use, it will then be transferred  
to nonvolatile memory. After you download the firmware, the  
agent will be reset and you will have to log back into the con-  
figuration program again. The following screen shows an  
example of the TFTP download menu.  
TFTP Download  
Return to Previous Panel  
Download Server IP : 203.70.236.12  
Download Filename : acc110.bin  
Download Mode  
: PERMANENT  
Start TFTP Download  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-20 TFTP Download Menu  
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Menu items are briefly described in the following table.  
Field  
Description  
Download Server IP IP address of a TFTP server. (TFTP stands for Trivial File Transfer Protocol.)  
Download Filename The *.bin file to download.  
Download Mode  
You can download to permanent flash ROM or temporary storage in RAM (for test purposes).  
However, if you download to temporary memory, this firmware will be lost upon power off. To  
update new agent firmware for permanent use, it must be downloaded to flash ROM.  
Start TFTP Download Initiates download process.  
Table 4.15 TFTP Download Menu  
Configuring the System  
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Xmodem Download  
Use the Xmodem Download menu under the Configuration  
Panel to download firmware to the hub. The Xmodem protocol  
is used to transfer binary files over a PC connection (i.e., using  
terminal emulation or modem access software).  
Specify the download mode and select Process Download.  
Open the file transfer utility in your terminal emulation or  
modem access program, specify the filename, and then start file  
transfer. When transferring files from you computer, be sure you  
specify “Send” or “Upload” file. The file should be a binary file  
from Accton; otherwise the agent will not accept it. Also be  
sure that you have already set the required bootup option for the  
target hub under the Hub Configuration menu.  
File transfer status is indicated by messages at the bottom of the  
screen. Firmware is first loaded into a temporary buffer. If you  
selected download for permanent use, it will then be transferred  
to nonvolatile memory. After you finish transfering the firmware,  
the agent will be reset and you will have to log back into the  
configuration program again. The following screen shows an  
example of the Xmodem Download menu.  
Xmodem Download  
Return to Previous Panel  
Download Mode : TEMPORARY  
Process Download  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-21 Xmodem Download Menu  
Menu items are briefly described in the following table.  
Field  
Description  
Download Mode  
Process Download  
You can download to permanent flash ROM or temporary storage in RAM (for test purposes only).  
Initiate the file transfer process.  
Table 4.16 Xmodem Download Menu  
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Changing User Passwords  
The on-board configuration program includes two fixed user  
types, including Admin and Guest. The access privilege is  
Read/Write for administrator and Read Only for guest. The  
default user names are “admin” and “guest,” without passwords.  
The administrator is the only user with write access for agent  
parameters. You should therefore assign a password to  
administrator as soon as possible, and store it in a safe place.  
The User Passwords menu is shown below.  
User Passwords  
Return to Previous Panel  
User Type User Name  
Password  
Admin : admin  
pluto  
Guest  
: guest  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-22 User Passwords Menu  
Menu items are briefly described in the following table.  
Field  
User Type  
Description  
There are only two fixed user types - Admin and Guest. The respective access rights are  
Read/Write and Read Only.  
User Name  
Password  
The login name required for access to the management agent.  
The password that must be provided with the user name to access the system. (not case sensitive)  
(not case sensitive)  
Table 4.17 User Passwords Menu  
Configuring the System  
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Console Lockout  
This function instructs the configuration program to  
automatically lock the console if no keyboard input is detected  
for the defined delay time. The Console Lockout menu is  
shown below.  
Console Lockout  
Return to Previous Panel  
Status : ON  
Delay Time : 20 Minutes  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-23 Console Lockout Menu  
Menu items are briefly described in the following table.  
Description  
Field  
Status  
The console lockout feature can be turned on or off.  
Delay Time The delay time for console lockout can set for any value in the range of 0 ~ 99 minutes.  
Table 4.18 Console Lockout Menu  
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Segment Statistics  
Displays statistics for the stack’s segments. These values can  
be used to indicate the approximate load balance in your stack.  
If the loading is severly unbalanced, you may consider  
adjusting your network connections or segment assignments.  
The Segment Statistics window is shown below.  
Screen statistics are not  
Segment Statistics  
automatically refreshed from the  
agent. Select Refresh Statistics  
to update the displayed values.  
Return to Previous Panel  
Refresh Statistics  
The values displayed have been  
accumulated since the last  
Segment 1 Segment 2 Segment 3  
system reboot or counter reset.  
Frames  
Bytes  
Collisions  
Alignment Errors  
CRC Errors  
Total Errors  
Symbol Errors  
:
:
:
:
:
:
:
19271  
3767321  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
57  
0
0
0
0
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-24 Segment Statistics Window  
Displayed items are briefly described in the following table.  
Field  
Description  
Refresh Statistics  
Frames  
Fetch the current statistics stored in the agent’s counters.  
Number of frames passing through this device.  
Bytes  
Number of bytes passing through this device.  
Collisions  
Number of simultaneous node transmissions detected by this device.  
Number of mis-synchronized data packets detected by this device.  
Number of Ethernet Cyclic Redundancy Check errors detected by this device.  
Total number of errors, including FCS, alignment, FramesTooLong, ShortEvents,  
LateEvents, Jabber, and DataRateMismatches detected on this device.  
Number of symbol errors (i.e., code-group errors including collision artifacts or transmission  
errors). Note that these errors are unique to 100 Mbps analog signals.  
Alignment Errors  
CRC Errors  
Total Errors  
Symbol Errors  
Table 4.19 Segment Statistics Menu  
Configuring the System  
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Hub Statistics  
Displays statistics for any hub in the stack. Select the required  
hub from the following menu.  
Hub Statistics: Hub Selection Menu  
Return to Previous Panel  
Hub 1 Statistics ...  
Hub 2 Statistics ...  
Hub 3 Statistics ...  
Hub 4 Statistics ...  
Hub 5 Statistics ...  
Hub 6 Statistics ...  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-25 Hub Statistics: Hub Selection Menu  
Hub statistics can be used to check on the general health of  
your hardware and network connections. If any of the error  
indications are extremely high (e.g., collisions or CRC errors),  
you should take appropriate measure to resolve the problem.  
Screen statistics are not  
Hub Statistics  
automatically refreshed from the  
agent. Select Refresh Statistics  
to update the displayed values.  
Return to Previous Panel  
Refresh Statistics  
The values displayed have been  
accumulated since the last  
Hub ID : 1  
Position : 1  
system reboot or counter reset.  
Frames  
Bytes  
Collisions  
Alignment Errors  
CRC Errors  
Total Errors  
Symbol Errors  
:
:
:
:
:
:
:
20116  
3860016  
64  
0
0
0
0
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-26 Hub Statistics Window  
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Displayed items are briefly described in the following table.  
Field  
Hub ID  
Description  
Hub identifier within the stack.  
Position  
Frames  
Bytes  
The physical position in the stack (as determined by its position from the top of the FlexBus chain).  
Number of frames passing through this device.  
Number of bytes passing through this device.  
Collisions  
Number of simultaneous node transmissions detected by this device.  
Alignment Errors Number of mis-synchronized data packets detected by this device.  
CRC Errors  
Total Errors  
Number of Ethernet Cyclic Redundancy Check errors detected by this device.  
Total number of errors, including FCS, alignment, FramesTooLong, ShortEvents, LateEvents,  
Jabber, and DataRateMismatches detected on this device.  
Symbol Errors  
Number of symbol errors (i.e., code-group errors including collision artifacts or transmission errors).  
Note that these errors are unique to 100 Mbps analog signals.  
Table 4.20 Hub Statistics Menu  
Port Statistics  
Displays statistics for any port in the stack. Select the required  
port from the following menu.  
Port Statistics: Port Selection Menu  
Return to Previous Panel  
Select port to get statistics  
Hub ID |  
Port ID  
---------+-------------------------------------------------  
1
2
3
4
5
6
|
|
|
|
|
|
1 2 3 4 5 6 7 8 9 10 11 12 SEM  
1 2 3 4 5 6 7 8 9 10 11 12 SEM  
1 2 3 4 5 6 7 8 9 10 11 12 SEM  
1 2 3 4 5 6 7 8 9 10 11 12 SEM  
1 2 3 4 5 6 7 8 9 10 11 12 SEM  
1 2 3 4 5 6 7 8 9 10 11 12 SEM  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-27 Port Statistics: Port Selection Menu  
Configuring the System  
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Statistics for Repeater Ports  
Statistics for repeater ports covers a wide range of Ethernet  
variables. If any of the error indications are extremely high,  
there may be a problem with the port, the attached device, or  
the network cabling. (The System Diagnostics section in Appendix  
A provides help on troubleshooting.) The Port Statistics  
window is shown below.  
Screen statistics  
are not  
Port Statistics  
automatically  
refreshed from the  
agent. Select  
Refresh Statistics  
to update the  
Return to Previous Panel  
Refresh Statistics  
displayed values.  
Hub ID : 1  
Port ID : 10  
Position : 1  
The values  
displayed have  
been accumulated  
since the last  
system reboot or  
counter reset.  
Readable Frames  
Readable Octets  
FCS Errors  
Alignment Errors  
Frames Too Long  
Short Events  
Runts  
:
:
:
:
:
:
:
:
20524  
3904366  
Late Events  
:
0
Data Rate Mismatches :  
0
0
0
1
0
0
0
0
2
Auto Partitions  
Total Errors  
LSA Changes  
:
:
:
Last Source Address : 00-00-E8-90-1B-73  
Symbol Errors  
:
0
Collisions  
65  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-28 Port Statistics Menu  
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Displayed items are briefly described in the following table.  
Field  
Hub ID  
Description  
Hub identifier within the stack.  
Position  
Port ID  
The physical position in the stack (as determined by its position from the top of the FlexBus chain).  
Port identifier on the hub.  
Readable Frames Number of good frames received.  
Readable Octets  
FCS Errors  
Alignment Errors  
Number of good octets received.  
Number of Frame Control Sequence errors.  
Number of mis-synchronized data packets detected by this device.  
Frames Too Long Number of times frame length has exceeded the maximum allowable size (i.e., 1518 bytes).  
Short Events  
Runts  
Collisions  
Late Events  
Data Rate Mis.  
Auto Partitions  
Total Errors  
Number of short fragments.  
Number of fragments (that were too long to qualify as short events).  
Number of simultaneous node transmissions detected by this device.  
Number of frames where a collision occurred late in the transmission.  
Number of frames for which the data rate does not match the local frequency.  
Number of times this port has been automatically partitioned due to jabber.  
Total number of errors, including FCS, alignment, FramesTooLong, ShortEvents, LateEvents,  
Jabber, and DataRateMismatches detected on this device.  
LSA Changes  
Number of times the source address has changed.  
Last Source Addr. Last source address.  
Symbol Errors Number of symbol errors (i.e., code-group errors including collision artifacts or transmission errors).  
Note that these errors are unique to 100 Mbps analog signals.  
Table 4.21 Port Statistics Menu  
Configuring the System  
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Statistics for SmartExtender Module  
Statistics for the SmartExtender Module includes the basic  
Ethernet variables shown below.  
Screen statistics are not  
SEM Port Statistics  
Return to Previous Panel  
Refresh Statistics  
automatically refreshed from the  
agent. Select Refresh Statistics  
to update the displayed values.  
The values displayed have been  
accumulated since the last  
Hub ID : 1  
Position : 1  
Port ID : SEM  
system reboot or counter reset.  
In Frames  
In Octets  
:
4265954  
FCS Errors  
Frames Too Long :  
:
52  
0
: 842532471  
In Discarded  
Out Frames  
Out Octets  
Out Discarded  
:
:
:
:
744817  
24808  
4432038  
1202  
Runts  
Collisions  
:
:
33  
11678  
Return to previous panel.  
Use arrow keys to move. <Enter> to confirm.  
<Ctrl+T> to return to Main Menu.  
Figure 4-29 SEM Port Statistics Menu  
Displayed items are briefly described in the following table.  
Field  
Description  
Hub ID  
Hub identifier within the stack.  
Position  
Port ID  
The physical position in the stack (as determined by its position from the top of the FlexBus chain).  
Port identifier on the hub.  
In Frames  
In Octets  
Number of frames received.  
Number of octets received.  
In Discarded  
Out Frames  
Out Octets  
Out Discarded  
FCS Errors  
Number of frames received and filtered.  
Number of frames transmitted.  
Number of octets transmitted.  
Number of frames transmitted and filtered (i.e., at the repeater to SEM interface).  
Number of Frame Control Sequence errors.  
Frames Too Long Number of times frame length has exceeded the maximum allowable size (i.e., 1518 bytes)  
Runts  
Collisions  
Number of fragments (that were too long to qualify as short events).  
Number of simultaneous node transmissions detected by this device.  
Table 4.22 SEM Port Statistics Menu  
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Chapter 5: Hardware Reference  
Before connecting any network device to this hub, please  
review Chapter 2 for information on system installation,  
Chapter 3 for a brief look at common network architectures,  
and Chapter 4 for information on system configuration via the  
menu-driven interface. This chapter describes the hardware  
features of the Fast EtherHub 3500 Series. If you are not sure  
how to make network connections, or do not understand the  
hub’s indicators, you should refer to this chapter.  
The Fast EtherHub 3500 Series provides a manageable 100  
Mbps Fast Ethernet stack. It also supports optional network  
expansion modules that can be used to connect the hub (or  
stack) to the extended network with 100BASE-TX (10BASE-T),  
100BASE-FX or 100BASE-T4 media types. Moreover, these  
extender modules serve to break up the local collision domain,  
allowing you to overcome the limited network diameter (i.e.,  
two-hub limit) normally associated with Fast Ethernet.  
This hub provides a simple interface for configuring or  
monitoring network connections. Figure 5.1 shows the front  
panel, which includes a comprehensive array of indicators, 12  
RJ-45 station ports, and a slot for plugging in an optional  
SmartExtender Module. Each Fast EtherHub 3500 model has  
similar indicators and other front panel components. However,  
note that LEDs corresponding to the SNMP agent (i.e., Master  
and Backup) are not provided for the Fast EtherHub-12i.  
Figure 5-1 Front Panel of EtherHub-12mi  
Hardware Reference  
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Indicator Panel  
The SmartWatch panel includes comprehensive indicators  
for monitoring the hub. It displays the status of the network  
connections for each port, the hub’s connection to the stack,  
and the status of the on-board SNMP agent. (Note that Master  
and Backup LEDs are not provided for the Fast EtherHub-12i.)  
A quick glance can provide critical information, such as if a  
power module has failed or if a problem exists on the network.  
The following sections describe the function of each indicator.  
Figure 5-2 Indicators for the EtherHub-12mi  
Power Indicator  
Color:  
Label:  
Green  
PWR 1 / PWR 2  
Function: Indicators for primary and backup power modules.  
State  
ON  
OFF  
Indication  
Unit is receiving power via indicated module.  
Power is disconnected; or module not installed.  
Power supply module has failed.  
BLINKING  
Table 5.1 Power Indicator  
SmartExtender Module Indicator  
Color:  
Label:  
Green  
SEM  
Function: Displays status of the SmartExtender Module.  
State  
ON  
OFF  
Indication  
Unit is installed and functioning properly.  
No module is installed in the expansion slot.  
Module has failed.  
BLINKING  
Table 5.2 SmartExtender Module Indicator  
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There are four optional SmartExtender Modules as described  
under Connecting to a SmartExtender Module in Chapter 2. The  
indicators provided with each module are described below.  
EM3551-TX for 100BASE-TX or 10BASE-T  
EM3551-T4 for 100BASE-T4  
EM3551-FX-ST for 100BASE-FX  
EM3551-FX-SC for 100BASE-FX  
LED  
100  
State  
ON  
OFF  
Indication  
Port is set at 100 Mbps.  
Port is set at 10 Mbps.  
FDX ON  
OFF  
Port is set for full-duplex operation.  
Port is set for half-duplex operation.  
Packet collisions, blinking is proportional to collision rate.  
Port has a valid network connection.  
Port is transmitting packets.  
Col  
Link  
Tx  
BLINKING  
ON  
ON  
ON  
Rx  
Port is receiving packets.  
Table 5.3 SmartExtender Module Indicators  
Interhub  
Color:  
Label:  
Green  
Interhub  
Function: Indicates a valid connection between hub and agent.  
LED Activity  
BLINKING LIGHT  
Condition  
ON  
Indication  
Hub has a valid connection to the Agent through  
the FlexBus 3500 port on the backplane.  
Hub is in a stand-alone configuration; or hub  
does not have a valid connection to the network  
system it monitors.  
NO LIGHT  
OFF  
Table 5.4 Interhub Indicator  
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SNMP  
Color:  
Label:  
Green  
SNMP  
Function: Indicates that an SNMP frame is being received by  
the Agent.  
LED Activity  
BLINKING LIGHT  
NO LIGHT  
Condition  
ON  
OFF  
Indication  
Hub is presently receiving an SNMP frame.  
Hub is not receiving an SNMP frame.  
Table 5.5 SNMP Indicator  
In a stacked system where a Master and Slave agent exist, the  
SNMP LED of the active agent will blink if an SNMP frame is  
received. Normally, this would mean that the Master agent’s  
SNMP LED will be ON. However, if the Master agent fails, the  
Slave agent’s SNMP LED should light up. See the section on  
Master Agent in Chapter 4 for related information.  
Segment Indicators  
Color:  
Label:  
Green  
Segment  
Function: Indicates which segment is attached to the hub  
There are 3 Ethernet segments embedded in the FlexBus 3500  
ports located on the backplane of the Fast EtherHub 3500 series.  
These units can be attached to any one of the three Ethernet  
segments (or may be completely isolated from the backplane).  
The indicators show which segment the unit is connected to.  
The Fast EtherHubs can be completely isolated except for the  
management channel (in which case all segment indicators will be  
extinguished).  
F
If a segment LED is flashing, this indicates that the FlexBus cable is  
not securely plugged into the backplane connector, or the backplane  
connection has malfunctioned.  
5-4  
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Management Agent Indicators  
Color:  
Green  
Labels:  
Master, Backup  
Function: Displays the status of on-board management  
agents.  
LED  
Condition  
Indication  
ON  
SNMP module is installed and functioning as the primary  
agent.  
Master  
OFF  
ON  
SNMP module is not installed or has failed.  
SNMP module is installed and functioning as a backup  
agent.  
Backup  
OFF  
SNMP module may not be installed. If one is installed,  
it may be functioning as the primary agent; otherwise it  
may have been set up as a backup agent and has failed.  
Table 5.6 Management Agent Indicators  
Hub ID Indicator  
Color:  
Label:  
Green  
Hub ID  
Function: Indicates Unit ID Setting.  
In a stacked system, each hub unit has a unique ID. The Fast  
EtherHub 3500 hub series is equipped with a function that  
automatically sets the hub ID, freeing the user from this task.  
The table below shows possible display combinations for the  
hub unit’s ID LED indicators marked “1 2 4” and their  
corresponding meaning. These LEDs display the binary  
equivalent of the selected ID number (displayed left to right).  
In normal operation, the LEDS turned ON display a steady  
light; while in configuration mode, they blink.  
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Hub ID LED 1 Hub ID LED 2 Hub ID LED 4 Hub ID Number Setting  
ON  
ON  
ON  
(DEFAULT)  
Used for automatic Hub ID setting.  
ON  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
ON  
ON  
OFF  
OFF  
ON  
OFF  
OFF  
OFF  
ON  
ON  
ON  
Hub ID 1  
Hub ID 2  
Hub ID 3  
Hub ID 4  
Hub ID 5  
Hub ID 6  
Table 5.7 Hub Indicators  
Serial  
Color:  
Label:  
Green  
Serial  
Function: Indicates connection to a management console.  
LED Activity  
BLINKING LIGHT  
Condition  
ON  
Indication  
Agent has a valid connection to a  
management console using its RS232 serial  
port. A valid link only occurs when the  
management console is sending a message  
to or receiving a message from the agent.  
No connection to a management console.  
NO LIGHT  
OFF  
Table 5.8 Serial Indicator  
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Terminator  
Color:  
Label:  
Green  
Terminator  
Function: Indicates if a unit is located in a terminal position  
in a stacked system.  
This LED shows if the hub is  
connected to the stack’s  
backplane and the FlexBus  
cable properly terminated.  
The unit has an auto-terminate function that is enabled when it  
is at the end of a stack. Note that in a stand-alone configuration,  
this LED is ON because of the auto-terminate function.  
LED Activity  
Condition  
Indication  
STEADY LIGHT  
ON  
The hub is at the end of a stacked system or  
in a stand-alone configuration.  
NO LIGHT  
OFF  
The hub is connected to a stacked system,  
but not at the terminal position of a stack.  
Table 5.9 Terminator Indicator  
Isolation  
Color:  
Label:  
Green  
Isolation  
Function: Indicates the hub is isolated from all Ethernet  
segments in the stack’s backplane.  
LED Activity  
STEADY LIGHT  
NO LIGHT  
Condition  
ON  
OFF  
Indication  
Hub is isolated from all segments.  
Hub is attached to one of the 3 segments  
of the backplane.  
Table 5.10 Isolation Indicator  
Utilization Indicators  
Color:  
Label:  
Green and yellow  
Utilization  
Label (%)  
1, 5, 15  
30, 65+  
Color  
Green  
Yellow  
Function  
Indicates percentage of LAN bandwidth in use by valid  
data.  
Table 5.11 Utilization Indicators  
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There are 5 LEDs representing the percentage of network  
bandwidth in use by the attached (or isolated) segment. When  
active, these LEDs look like a stereo’s equalizer display. The  
hub updates this display every 0.5 seconds.  
For example, if network utilization reaches 1%, the LED  
labeled 1 will light. However, if network utilization rises above  
1% (e.g., 30%), the LED labeled 30 and all the other LEDs  
before it (i.e., 1, 5, and 15) will light in rapid succession.  
These LEDs monitor the share of valid network frames  
transmitted by this hub within a 100 Mbps bandwidth. They  
provide a quick way to monitor the current traffic load relative  
to the capacity available to the attached/isolated segment.  
Collision Indicators  
Color:  
Label:  
Green and yellow  
Collision  
Label (%)  
1, 3, 5  
10, 15+  
Color  
Green  
Yellow  
Function  
Shows percentage of packet collisions occurring  
out of the total packets received by the hub.  
Table 5.12 Collision Indicators  
Collisions occur when two or more devices connected to a hub  
attempt to transmit data simultaneously on the network. When  
a collision occurs, devices pause and then re-transmit after a  
pseudo-random wait period. Because wait periods differ among  
devices, successive collisions become increasingly improbable.  
The Collision LEDs assist the network manager in monitoring  
the percentage of packet collisions occurring relative to the total  
packets received by the hub. Similar to Utilization LEDs, the  
Collision LEDs have 5 numbers representing collision percentage.  
When collisions reach a level marked on the LED display, the  
corresponding LED lights up.  
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For example, if packet collisions reach 1%, the LED labeled 1  
will light up. However, if collisions go beyond 1% (e.g., 15%),  
the LED labeled 15+ and all the other LEDs before it (i.e., 1, 3,  
5, and 10) will also light up in rapid succession.  
When more than 31 consecutive collisions occur on the cable  
segment connected to a port, that port is automatically partitioned by  
the hub. The hub automatically reconnects this port when a data  
packet longer than 512 bits (normal) is transmitted or received by the  
partitioned port without collision. This applies to all STP station ports  
and the cascade port.  
F
Partition/Disable Indicators  
Color:  
Label:  
Yellow  
Partition/Disable  
Function: Indicates port has been partitioned due to network  
error or intentionally disabled.  
State  
ON  
Condition  
Indication  
Partitioned Indicates port has been partitioned due to an abnormal  
network condition.  
OFF  
OK  
Port is in good condition.  
BLINKING Disabled  
Indicates the port has been disabled via agent software.  
Table 5.13 Partition/Disable Indicators  
Partition - A port is temporarily partitioned when a line error  
or too many collisions are detected on the attached segment.  
While automatically partitioned, the port continues to receive  
data from the segment. However, data is not transmitted onto  
the segment. When the problem is corrected or a valid data  
packet is received through the port, it is automatically recon-  
nected. When partitioning occurs, the port’s Partition LED  
will be continually lit. Otherwise, this LED should be OFF.  
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Disable - Disabling a port is the same as manually partitioning it,  
except that you must also manually reconnect it. For example,  
to prevent a certain device from accessing the network or to  
reduce network traffic you may opt to disable the port. No  
incoming packet transmission can occur on a disabled port.  
Ports can be disabled/enabled using the on-board configuration  
program or via optional network management software. They  
can also be enabled by restarting the system, which restores the  
factory default settings.  
The Partition/Disable LEDs are also used as diagnostic LEDs.  
Please refer to Diagnostic Test Indicators for more information.  
F
Port Status Indicators  
There are 12 pairs of port status indicators. Each pair consists  
of a Link/Activity LED (in the top row) and Partition/Disable  
LED (in the bottom row). The last pair displays status for both  
the 12MDI-X and 12MDI port, either of which is currently in  
use. Also note that port status for the memory extender  
modules is displayed directly on the module as described in the  
section on SmartExtender Module Indicator earlier in this chapter.  
Link/Traffic Indicators  
Color:  
Label:  
Green  
Link/Traffic  
Function: Indicates port link and activity.  
State  
Indication  
ON  
OFF  
Indicates a valid link has been established on this port.  
No valid link has been established on this port.  
BLINKING  
Indicates that the port is receiving packets; rate of blinking corresponds  
to amount of traffic passing through this port.  
Table 5.14 Link/Traffic Indicators  
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Link - The Link LED should light up when a device (e.g., computer,  
hub or router) establishes a valid connection via the RJ-45 port.  
Troubleshooting - If the Link LED does not light up when a device is  
connected to a port, check that both the hub and connected device are  
powered on. For devices connected to the hub using twisted-pair  
cable, check that the cable length does not exceed 100 meters. You  
should use standard, straight-through cables and not crossover or  
other specialized cables.  
Traffic - Refers to the movement of packets received by the port.  
A port’s Traffic LED will blink in proportion to the rate of  
traffic passing through the port. It will remain ON during high  
traffic rates. The network manager can easily determine the  
activity on a port by viewing this LED.  
Diagnostic Test Indicators  
The RJ-45 Partition/Disable LEDs not only monitor the partition  
or disabling of an RJ-45 port, they also monitor diagnostic test  
results.  
State  
Indication  
ON  
Corresponding hardware component failed the diagnostic test.  
OFF Corresponding hardware component successfully passed the diagnostic test.  
Table 5.15 Diagnostic Indicators  
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After power on, the hub automatically performs a diagnostic  
test. The diagnostic tests display results for the repeater board  
via the Partition/Disable LEDs on the front panel. Test results  
for the agent board can only be seen via a console connection to  
the serial port. The following table shows how test results for  
the repeater board are indicated by the Partition/Disable LEDs.  
Test Function/Component  
of Repeater Board  
Partition/Disabled  
LED Indicator  
Boot ROM  
Hub Configuration EEPROM  
1
2
RAM for Repeater Board CPU  
3
Repeater Information Base SRAM  
Repeater Interface Controller  
4
5
Routing Table for Internal SEM Port  
Input Queue for Internal SEM Port  
Output Queue for Internal SEM Port  
Routing Table for External SEM Port  
Input Queue for External SEM Port  
Output Queue for External SEM Port  
7
8
9
10  
11  
12  
Table 5.16 Diagnostic Results for Repeater Board  
The system tests each component one at a time. The  
corresponding indicator will display a blinking light (ON) after  
test completion to show which component failed the test. The  
unit will complete the test cycle even if a problem is detected on  
any component. If all Partition/Disable LEDs are off, then all the  
tested components have successfully passed diagnostics. You  
must have a console connected to serial port to view the results  
of diagnostic testing for the agent board.  
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Network Connections  
The front panel on the Fast EtherHub 3500 Series provides the  
following network options:  
• Connections to end-node devices using RJ-45 station ports.  
• Cascaded connection to a compatible switch or router using  
the daisy-chain port.  
• Backbone connection using the SmartExtender Modules for  
100BASE-TX (10BASE-T), 100BASE-T4 or 100BASE-FX.  
Station Ports  
The hub has 12 RJ-45 station ports that can be used to connect  
end-node devices (e.g., file servers, workstations or printers).  
Be sure you have a Fast Ethernet network interface card  
installed in the device to be connected to the hub. Then  
connect it to any available RJ-45 station port on the hub (i.e.,  
1X ~ 12MDI-X) using straight-through shielded or unshielded  
(100W STP or UTP) twisted-pair cable.  
Daisy-Chain Port  
A compatible switch or other network interconnection device can  
be attached to the 12MDI daisy-chain port. Use straight-through  
shielded or unshielded (100W STP or UTP) twisted-pair cable to  
connect to an MDI-X station port on the target device. Note that  
this device is a Class I hub and cannot be cascade to another  
repeater hub within the same collision domain. Refer to the  
section on Making a Connection via the MDI Daisy-Chain Port in Chapter 2  
for a detailed description on cascading.  
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Serial Port  
Use the UTP cable and  
connection converter provided  
with your unit for plugging into a  
PC or modem as described in  
Chapter 4.  
The unit has one 9-pin RS232 male connector labeled Serial. It  
can be used to perform basic configuration or to establish a  
network management connection with the hub. By using a direct  
or remote connection, in conjunction with a terminal emulation  
program (that supports Xmodem protocol), you can access the  
on-board Fast EtherHub 3500 System Configuration Program.  
This program can be used to configure the attached hub or stack,  
or to upgrade system firmware. Complete details on how to set  
up a connection to the serial port and how to use the on-board  
configuration program are included in Chapter 4.  
Note that configuration options  
provided for the Fast EtherHub-  
12i are limited because this  
model does not include an  
agent. Moreover, configuration  
via the serial port on this model  
is limited to the attached hub  
only (i.e., it cannot manage  
other hubs in the stack).  
The Fast EtherHub 3500 Series also supports in-band  
management (with optional network management software e.g.,  
AccView/Open) via a remote connection by connecting to the  
serial port using SLIP protocol. In this manner you can carry out  
full SNMP management remotely via a modem connection.  
(Refer to Remote Connection in Chapter 4.)  
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Rear Panel Components  
The rear panel is also similar for all versions. Figure 5.3 shows  
the rear panel, which includes a primary power supply, a slot  
for an optional secondary power supply module, and two  
backplane connectors used for stacking up to 6 hubs. For easier  
management and control of the hub, familiarize yourself with  
the indicators, ports, and backplane connectors provided by the  
hub.  
Figure 5-3 Rear Panel  
Power Supply Modules  
The Fast EtherHub 3500 series supports both a primary and  
backup power supply. The backup power supply is optional (Part  
Number EM3550-PWR). When using two modules, the load is  
shared equally between both, reducing the chance of failure, but  
still providing backup power in case either module should fail. By  
connecting the power supplies to separate AC circuits, you can  
also provide backup in case an AC supply circuit should fail. This  
ensures that there will be no interruption to network or agent  
processes in case of a limited power failure. The power socket  
accepts AC power from 100 to 240V (± 10%) at 50 to 60 Hz (±  
3Hz). The hub is equipped with a universal full-range power  
source.  
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FlexBus 3500 Ports  
The unit has two SCSI FlexBus connectors labeled In and Out  
for combining the hub with other compatible hubs to form a  
single repeater stack. The FlexBus 3500 stack cable that comes  
with this package is used specifically for these ports. Only  
hubs cascaded through the In and Out connection can be  
managed by a network management agent.  
In  
Using a FlexBus 3500 cable, connect this port to the “Out” port  
of any Fast EtherHub 3500 series hub.  
Out  
Using a FlexBus 3500 cable, connect this port to the “In” port  
of any Fast EtherHub 3500 series hub.  
The unit also supports “hot remove” for the FlexBus cable. This allows  
you to unplug the FlexBus cable while the unit is powered on. However,  
note that inter-hub traffic may be disrupted while the FlexBus cable is  
unplugged.  
F
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Appendix A: Troubleshooting  
Diagnosing Hub Indicators  
The Fast EtherHub 3500 Series can be easily monitored through  
its comprehensive panel indicators. These indicators assist the  
network manager in identifying problems the hub may encounter.  
This section describes common problems you may encounter  
and possible solutions.  
Symptom: Link indicator does not light up (green) after making a connection.  
Cause:  
Network interface (e.g., a network adapter card on the attached  
device), network cable, or hub port is defective.  
Solution: Verify that the hub and attached device are powered on. Be  
sure the cable is plugged into both the hub and corresponding  
device. Verify that the proper cable type is used and its length  
does not exceed specified limits (Chapter 2). Check the adapter  
on the attached device and cable connections for possible  
defects. Replace the defective adapter or cable if necessary.  
Symptom: Power indicator does not light up (green) after power on.  
Cause:  
Defective power outlet, power cord, or internal power supply.  
Solution: Check the power outlet by plugging in another device that is  
functioning properly. Check the power cord with another  
device. If these measures fail to resolve the problem, have the  
unit’s power supply replaced by a qualified Accton distributor.  
Use the diagnostic procedures described in Chapter 2 to verify  
that all other system components are functioning properly. If  
any component fails the diagnostic test, contact your Accton  
distributor for assistance.  
Troubleshooting  
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System Diagnostics  
Power and Cooling Problems  
If the power indicator does not turn on when the power cord is  
plugged in, you may have a problem with the power outlet,  
power cord, or internal power supply as explained in the  
previous section. However, if the unit powers off after running  
for a while, check for loose power connections, power losses or  
surges at the power outlet, and verify that the fans on back of  
the unit are unobstructed and running prior to shutdown. If you  
still cannot isolate the problem, then the internal power supply  
may be defective. In this case, contact your Accton distributor  
for assistance.  
Installation  
Verify that all system components have been properly installed.  
If one or more components appear to be malfunctioning (e.g.,  
the power cord or network cabling), test them in an alternate  
environment where you are sure that all the other components  
are functioning properly.  
Transmission Mode  
If any devices are attached to the 100BASE-TX or FX  
SmartExtender Module, and operate at full duplex but do not  
support auto-negotiation, then you must manually set the  
transmission mode for this port on the hub. (Refer to Configuring  
Port Parameters in Chapter 5.)  
The default method of selecting the transmission mode for the  
100BASE-TX and FX extender module is auto-negotiation.  
Therefore, if the Link signal is disrupted (e.g., by unplugging the  
network cable and plugging it back in again, or by resetting the  
power), the port will try to reestablish communications with the  
attached device via auto-negotiation. If auto-negotiation fails,  
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then communications are set to half duplex by default. Based  
on this type of industry-standard connection policy, if you are  
using a full-duplex device that does not support auto-negotiation,  
communications can be easily lost (i.e., reset to the wrong  
mode) whenever the attached device is reset or experiences a  
power fluctuation. The best way to resolve this problem is to  
upgrade these devices to versions which support auto-  
negotiation.  
Cabling  
1. Verify that the cabling type is correct. Be sure all cable  
connectors are securely seated in the required ports. Use  
100W cable for all twisted-pair connections to 100BASE-TX  
or T4 ports. Use Category 5 cable for all 100 Mbps Fast  
Ethernet connections; or use Category 3, 4 or 5 cable when  
making 10 Mbps Ethernet connections to the 100BASE-TX  
extender module.  
2. Verify that the cabling type is correct. Be sure all cable  
connectors are securely seated in the required ports.  
Straight-through cable should be used for all standard  
twisted-pair connections.  
3. When cascading two devices using RJ-45 station ports at  
both ends of the cable (i.e., not an MDI port), make sure a  
crossover cable is used. Crossover cable should only be used  
if the a daisy-chain port is not available.  
4. Make sure all devices are connected to the network.  
Equipment may have been unintentionally disconnected from  
the network.  
External Adapters  
Make sure the network adapter cards installed in the  
workstations are compatible and are in good working condition.  
Troubleshooting  
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Physical Configuration  
If problems occur after altering the network configuration,  
restore the original connections, and try to track the problem  
down by implementing the new changes, one step at a time.  
Ensure that cable distances and other physical aspects of the  
installation do not exceed recommendations (Chapter 2).  
System Integrity  
As a last resort verify the hub’s integrity with a power-on reset.  
Turn the power to the hub off and then on several times. If the  
problem still persists and you have completed all the preceding  
diagnoses, then contact your Accton distributor for further  
assistance. (Refer to Appendix E.)  
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Appendix B: Pin Assignments  
RJ-45 Port  
RJ-45 station ports (MDI-X) can be attached to any devices  
which use a standard LAN interface (e.g., a workstation, server  
or router). RJ-45 daisy-chain ports (MDI) can be cascaded to a  
station port on similar networking devices (e.g., a switch). Use  
unshielded twisted-pair (UTP) or shielded twisted-pair (STP)  
cable for RJ-45 connections: 100W Category 3, 4 or 5 cable for  
10 Mbps connections or 100W Category 5 cable for 100 Mbps  
connections. Also be sure that the length of any twisted-pair  
connection does not exceed 100 meters.  
Figure B-1  
RJ-45 Connector  
(on the Hub Side)  
Assignment for MDI-X  
Station Ports 1 ~ 12  
Input Receive Data +  
Input Receive Data -  
Output Transmit Data + Input Receive Data +  
Output Transmit Data -  
Assignment for  
Cascade Port 12MDI  
Output Transmit Data +  
Output Transmit Data -  
Pin  
1
2
3
6
Input Receive Data -  
Not Used  
4,5,7,8 Not Used  
Table B.1 RJ-45 Pin Assignments  
Schematics for both straight and crossover twisted-pair cable  
are shown below.  
Straight-Through  
Crossover  
(Hub)  
(Adapter)  
1 OTD+  
2 OTD-  
3 IRD+  
6 IRD-  
(Hub)  
(Hub)  
1 IRD+  
2 IRD-  
3 OTD+  
6 OTD-  
1 IRD+  
2 IRD-  
3 OTD+  
6 OTD-  
1 IRD+  
2 IRD-  
3 OTD+  
6 OTD-  
Pin Assignments  
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DB9 Serial Port Pin Description  
The DB9 serial port on the front panel is used to connect the  
hub to a management device. The on-board menu-driven  
configuration program can be accessed from a terminal, a PC  
running a terminal emulation program, or from a remote  
location via a modem connection. In-band management  
software (which usually provides a graphical interface) can also  
be used to manage the hub from a remote location via a modem  
connection, by running SLIP over TCP/IP. You can use the  
managment port to configure port settings (e.g., enabled or  
disabled), or to update device firmware. The pin assignments  
used to connect various device types to the hub’s managment  
port are provided in the following tables.  
Figure B-2  
DB9 Serial Port  
(on the Hub Side)  
EIA  
Circuit  
CCITT  
Signal  
Hub’s  
DB9 DTE  
Pin #  
PC DB9  
DTE  
Pin #  
Modem  
DB25 DCE  
Pin #  
8
3
2
20  
7
6
4
Signal  
Direction  
DTE -DCE  
< --------  
< --------  
-------- >  
-------- >  
----------  
< --------  
-------- >  
< --------  
< --------  
Description  
CF  
BB  
BA  
CD  
AB  
CC  
CA  
CB  
CE  
109  
104  
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
DCD (Data Carrier Detected)  
RxD (Received Data)  
TxD (Transmitted Data)  
DTR (Data Terminal Ready)  
SG (Signal Ground)  
DSR (Data Set Ready)  
RTS (Request-to-Send)  
CTS (Clear-to-Send)  
103  
108.2  
102  
107  
105  
106  
125  
5
22  
RI (Ring Indicator)  
Table B.2 DB9 Port Pin Assignments  
B-2  
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Hub’s 9-Pin Serial Port to PC's 9-Pin COM Port  
Hub’s 9-Pin  
Serial Port  
1 DCD  
Cable Wiring  
PC's 9-Pin  
COM Port  
1 DCD  
2 RXD  
3 TXD  
4 DTR  
5 SGND  
6 DSR  
7 RTS  
8 CTS  
9 RI  
2 RXD  
3 TXD  
4 DTR  
5 SGND  
6 DSR  
7 RTS  
8 CTS  
9 RI  
Table B.3 Full-Pin Connection from  
Hub’s 9-Pin Serial Port to PC's 9-Pin COM Port  
Hub’s 9-Pin  
Serial Port  
1 DCD  
Cable Wiring  
PC's 9-Pin  
COM Port  
1 DCD  
2 RXD  
3 TXD  
4 DTR  
5 SGND  
6 DSR  
7 RTS  
8 CTS  
9 RI  
2 RXD  
3 TXD  
4 DTR  
5 SGND  
6 DSR  
7 RTS  
8 CTS  
9 RI  
Table B.4 Three-Pin Connection from  
Hub’s 9-Pin Serial Port to PC's 9-Pin COM Port  
Pin Assignments  
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Hub’s 9-Pin Serial Port to PC's 25-Pin DTE Port  
Hub’s 9-Pin Serial Port  
Cable Wiring  
PC’s 25-Pin DTE Port  
4 RTS  
3 TXD  
2 RXD  
6 DSR  
7 SGND  
20 DTR  
5 CTS  
8 DCD  
22 RI  
1 DCD  
2 RXD  
3 TXD  
4 DTR  
5 SGND  
6 DSR  
7 RTS  
8 CTS  
9 RI  
Table B.5 Full-Pin Connection from  
Hub’s 9-Pin Serial Port to PC’s 25-Pin DTE Port  
Hub’s 9-Pin Serial Port  
1 DCD  
Cable Wiring  
PC’s 25-Pin DTE Port  
4 RTS  
2 RXD  
3 TXD  
3 TXD  
2 RXD  
4 DTR  
6 DSR  
5 SGND  
6 DSR  
7 SGND  
20 DTR  
7 RTS  
5 CTS  
8 CTS  
8 DCD  
9 RI  
22 RI  
Table B.6 Three-Pin Connection from  
Hub’s 9-Pin Serial Port to PC’s 25-Pin DTE Port  
B-4  
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Hub’s 9-Pin Serial Port to Modem's 25-Pin DCE Port  
Hub’s 9-Pin  
Serial Port  
Modem's 25-Pin  
DCE Port  
1
2
3
4
5
6
7
8
9
< ---------- DCD ----------  
< ---------- RXD ----------  
------------ TXD -------- >  
------------ DTR -------- >  
----------- SGND ---------  
< ---------- DSR ----------  
------------ RTS -------- >  
< --------- CTS -----------  
< ----------- RI ------------  
8
3
2
20  
7
6
4
5
22  
Table B.7 Hub’s 9-Pin Serial Port to  
Modem's 25-Pin DCE Port Pin Assignments  
Pin Assignments  
B-5  
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Appendix C: Product Specifications  
Product Specifications  
Repeater Board  
Access Method  
CSMA/CD, 100 Mbps  
Standards Conformance  
Communication Rate  
Media Supported  
IEEE 802.3u 100BASE-TX  
100 Mbps on Ports 1 - 12  
100WCat 5 twisted-pair (2-pair)  
Number of Ports  
12 100BASE-TX RJ-45 shielded station ports  
(Port 12 provides MDI-X or MDI connection);  
2 backplane ports for stack interconnection;  
and 1 serial port for system management  
On-board configuration via serial port or Telnet;  
or with optional in-band management software  
via a local network connection or via a remote  
modem link using SLIP over TCP/IP  
Comprehensive array of LEDs for displaying hub  
ID, network utilization, collision rate,  
SmartExtender Module, management agents,  
segment attachment, port link/activity, and port  
partition/disable  
Configuration  
Indicator Panel  
Microprocessor  
Fault Tolerance  
8031 (Fast EtherHub-12i);  
i960 (Fast EtherHub-12mi)  
Hot swappable modules; backup SNMP  
agent; redundant port links; and redundant  
power supply  
Dimensions  
440mm x 320mm x 65mm  
(17.3[ x 12.6[ x 2.6[)  
Power Input  
Power Consumption  
Temperature  
Humidity  
100 to 240 VAC (™10%), 50 to 60 Hz (™ 3%)  
1.5 Amp @ 100VAC, 0.8 Amp @ 230VAC  
5°C to 40°C (Standard Operating)  
5% to 85% (Noncondensing)  
Certification  
Emissions  
Immunity  
CE Mark  
FCC Class A, VCCI Class 1, CISPR Class A  
IEC 801-2,3,4,6, EN60555-2 Class A, EN60555-3  
UL, CSA, TÜV/GS, IEC 950  
Safety  
Product Specifications  
C-1  
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Repeater Stack  
Extender Port  
Expansion  
Up to 6 modules (72 station ports)  
Expansion Interface  
Configuration  
Segmentation  
FlexBus 3500 stack cable (68 wires)  
Automatic hub-ID and bus termination  
Supports 3 or more segments in a stack  
Access Method  
CSMA/CD, 10 Mbps or 100 Mbps  
IEEE 802.3u 100BASE-TX, FX, T4  
10 or 100 Mbps (via auto-detection)  
Full or half duplex for 100BASE-TX & FX,  
(via auto-negotiation); half duplex for T4  
100BASE-TX 100Wtwisted-pair (2-pair);  
Cat 5 for 100 Mbps,  
Standards Conformance  
Communication Rate  
Communication Mode  
Media Supported  
or Cat 3,4,5 for 10 Mbps  
100BASE-T4 100WCat 5 twisted-pair (4-pair)  
100BASE-FX 50/125 mm or 62.5/125 mm  
multimode fiber  
Number of Ports  
Indicator Panel  
Switching Criteria -  
1 100BASE-TX or T4 RJ-45 port, or  
1 100BASE-FX SC or ST type port;  
(TX, T4 provides MDI-X or MDI connection)  
Comprehensive array of LEDs for displaying  
port link, collision, activity, transmission speed,  
transmission mode  
Network Bridging Function filtering, forwarding and learning  
Switching Method  
adaptive cut-through:  
fragment-free or store-and-forward  
line speed  
Maximum Filtering Rate  
Maximum Forwarding Rate line speed  
Network Latency  
Address Table  
Queue Buffer  
less than 20 microseconds  
4K entries/port  
160K bytes  
C-2  
Product Specifications  
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Appendix D: Regulatory Standards  
EMI Warning  
FCC Class A Certification  
This device complies with Part 15 of the FCC Rules. Operation is  
subject to the following conditions:  
1. This device may not cause harmful interference, and  
2. This device must accept any interference received,including  
interference that may cause undesired operation.  
Warning: This equipment generates, uses, and can radiate radio  
frequency energy and, if not installed and used in accordance with the  
instruction manual, may cause interference to radio communications.  
It has been tested and found to comply with the limits for a Class A  
digital device pursuant to Subpart B of Part 15 of FCC Rules, which  
are designed to provide reasonable protection against such interference  
when operated in a commercial environment. Operation of this  
equipment in a residential area is likely to cause interference, in which  
case the user, at his own expense, will be required to take whatever  
measures are required to correct the interference.  
Warnings 1. Wear an anti-static wrist strap or take other suitable measures to  
prevent electrostatic discharge whenever handling this equipment.  
2. When connecting this hub to a power outlet, connect the field  
ground lead on the tri-pole power plug to a valid earth ground line  
to prevent electrical hazards.  
You may find the following booklet prepared by the Federal  
Communications Commission helpful:  
The Interference Handbook  
This booklet is available from the U.S. Government Printing Office.  
Washington, D.C. 20402. Stock No. 004-000-00345-4.  
Regulatory Standards  
D-1  
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In order to maintain compliance with the limits of a Class A digital  
device, Accton requires that you use a quality interface cable when  
connecting to this device. Changes or modifications not expressly  
approved by Accton could void the user’s authority to operate this  
equipment. Suggested cable type is:  
Note:  
•
•
•
2-pair 100WSTP/UTP for RJ-45 connections: 100BASE-TX (10BASE-T)  
4-pair 100WSTP/UTP for RJ-45 connections: 100BASE-T4  
50/125 or 62.5/125 mm  
multi-mode cable for fiber optic connections: 100BASE-FX  
Voluntary Control Council for Interference (VCCI-1)  
This equipment is in the 1st Class category (information equipment to  
be used in commercial and/or industrial areas) and conforms to the  
standards set by the Voluntary Control Council for Interference by  
Data Processing Equipment and Electronic Office Machines aimed at  
preventing radio interference in commercial and/or industrial areas.  
Consequently, when used in a residential area or in an adjacent area  
thereto, radio interference may be caused to radios and TV receivers, etc.  
Read the instructions for correct handling.  
This product also complies with CISPR22 Class A (EN55022 Class A).  
D-2  
Regulatory Standards  
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Fast EtherHub 3500 System User’s Guide  
EN55022 Declaration of Conformance  
This is to certify that the Accton Ethernet Hub is shielded against the  
generation of radio interference in accordance with the application of  
Council Directive 89/336/EEC, Article 4a. Conformity is declared by  
the application of EN55022:1987 Class A (CISPR 22:1985/BS  
6527:1988).  
CE Mark Declaration of Conformance  
This is to certify that this product complies with ISO/IEC Guide 22  
and EN45014. It conforms to the following specifications:  
EMC: EN55022(1988)/CISPR-22(1985)  
EN60555-2(1995)  
class A  
class A  
EN60555-3  
IEC 1000-4-2(1995)/IEC 801-2(1991) 4kV CD, 8kV AD  
IEC 1000-4-3(1995)/IEC 801-3(1984) 3V/m  
IEC 1000-4-4(1995)/IEC 801-4(1988) 1kV - (power line)  
0.5kV - (signal line)  
This product complies with the requirements of the Low Voltage  
Directive 73/23/EEC and the EMC Directive 89/336/EEC.  
Regulatory Standards  
D-3  
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Fast EtherHub 3500 System User’s Guide  
Safety Compliance  
Underwriters Laboratories Compliance Statement  
Important! Before making connections, make sure you have the  
correct Cord Set. Check it (read the label on the cable) against the  
following specification list.  
Operating Voltage  
120 Volts  
Cord Set Specifications  
UL Listed/CSA Certified Cord Set  
Minimum 18 AWG  
Type SVT or SJT three conductor cord  
Maximum length of 15 feet  
Parallel blade, grounding type attachment plug rated 15A, 125V  
240 Volts (For North America) UL Listed/CSA Certified Cord Set  
Minimum 18 AWG  
Type SVT or SJT three conductor cord  
Maximum length of 15 feet  
Tandem blade, grounding type attachment plug rated 15A, 125V  
Cord Set with H05VV-F cord having three conductors with minimum diameter of 0.75 mm  
2
240 Volts (For Europe only)  
IEC-320 receptacle  
Male plug rated 6A, 250V  
The unit automatically matches the connected input voltage.  
Therefore, no additional adjustments are necessary when connecting it  
to any input voltage within the range marked on the rear panel.  
Do not plug a phone jack connector into any of the RJ-45 ports.  
This may damage the hub.  
Les raccordeurs ne sont pas utilisé pour le système téléphonique!  
D-4  
Regulatory Standards  
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Fast EtherHub 3500 System User’s Guide  
Sicherheitshinweise  
1. Die Steckdose muß sich in der Nähe des Gerätes befinden und leicht  
zugänglich sein.  
2. Zum Reinigen den Stecker aus der Steckdose ziehen. Beim Reinigen  
keine Flüssigreiniger oder Sprays verwenden, sondern ein  
angefeuchtetes Tuch.  
3. Das produkt gerät nicht in Naßräume oder in der Nähe von Wasser  
benutzen, wie z.B. Badezimmer, Schwimmbad, Spülbecken usw. . Das  
Eindringen von Wasser kann zur Zerstörung des Gerätes führen.  
4. Das produkt gerät nicht auf einer unstabilen Unterlage, wie z.B.  
Rollwagen, Gestell usw., aufstellen. Es könnte herunterfallen und  
Verletzungen oder Beschädigungen von Mensch und Gerät  
verursachen.  
5. Die Belüftungsöffnungen nicht blockieren oder auf falscher Ober-  
fläche, wie Bett, Sofa usw., stellen. Durch die Blockierung kann es zur  
Zerstörung des Gerätes durch Überhitzung kommen.  
6. Versuchen Sie niemals dieses Gerät selbst zu warten, da beim Öffnen  
oder Abnehmen des Gehäuses die Gefahr eines elektrischen Schlages  
besteht.  
7. Keine Gegenstände auf das Anschlußkabel stellen, damit es nicht  
durch scharfe Kanten zerstört werden kann.  
8. Keinerlei Gegenstände durch die Öffungen in das Gerät stecken, da es  
dadurch sonst zu Kurzschlässen kommen kann.  
9. Bei Störungen des Gerätes den Wartungsdienst verständigen.  
10. Bei Reperaturen dürfen nur Orginalersatzteile oder Bauteile mit  
gleichen Eigenschaften verwendet werden. Andere Bauteile können  
Feuer, elektrischen Schlag oder andere Gefahren verursachen.  
11. Nach Beendigung von Wartungsarbeiten oder Reperaturen durch den  
Kundendienst sollte die Sicherheitsprüfung durchgeführt werden.  
12. Bei längerem Stillstand des Gerätes, ist diese von der Versorgungs-  
spannung zu trennen. Dies verhindert eine Beschädigung des Gerätes  
durch eine Überspannung in der Zuleitung.  
13. Der arbeitsplatzbezogene Lärmschutzpegel nach DIN 45 635 ist  
kleiner 70dB (A).  
Regulatory Standards  
D-5  
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Appendix E: Product Support Services  
Product Registration  
Fill in the Owner Registration Card and mail it to Accton Technology  
Corporation. Accton will keep your record and inform you of any new  
Accton unit developments.  
Problem Report  
If problems occur during unit operation, please check the adapter  
configuration settings, cables, connectors, network terminators,  
hardware compatibility and other network components.  
Write a description of the problem, including what problems occurred,  
when they occurred, duration of the problems, the unit number, serial  
number, hardware, software and the DOS version that you are using.  
Then contact your dealer or Accton Technology Corporation for  
assistance.  
Hardware Repair Service  
You must get an RMA (Return Materials Authorization) number  
before returning any hardware for repair. To obtain this number please  
inform Accton of your company name, address, unit name and model  
number, contact person, telephone number, and a problem description  
list. If your unit is under repair warranty you must also give your  
purchase date. Carefully pack your hardware. If possible, use the  
original carton. Mark the RMA number on the carton and send it to  
your dealer.  
After repair, Accton will inform you of the date of delivery and the  
exact amount due. Please send the payment by T/T (Telegram  
Transfer), and Accton will send you the fixed component after  
receiving payment. With or without warranty, if the hardware is found  
to be free of defects, you will only be charged for testing and handling.  
Product Support Services  
E-1  
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Fast EtherHub 3500 System User’s Guide  
Software Update and Upgrade Service  
Accton constantly improves its software units by adding enhancements  
and new features. Minor software updates are free of charge. If greater  
changes have been made to the software, Accton offers software  
upgrade services at a specially reduced price.  
Bulletin Board Service (BBS)  
•
In countries other than the U.S., call 886-3-5770-654 to reach  
Accton Taiwan’s modem line. Modems with 14400 through 2400  
baud are supported. Choose 8 data bits, 1 stop bit and no parity.  
Standard VT100 terminal emulation is supported  
•
In the United States, call 408-452-8828 to reach the Accton  
USA’s BBS line. Modems with 14400 through 2400 baud are  
supported. Choose 8 data bits, 1 stop bit and no parity. Standard  
VT100 terminal emulation is supported.  
Interactive Fast fax (U.S.A. office)  
Printed technical documentation can be sent to your fax machine, 24-  
hours a day.  
•
Call 408-452-8811 to reach Accton’s interactive Fast fax service.  
You will need a Touch-Tone phone and a fax machine (or  
equivalent). Choose document 911 for a listing of technical  
bulletins.  
E-2  
Product Support Services  
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Fast EtherHub 3500 System User’s Guide  
Technical Support  
Your dealer or installer is the person who understands your network  
and Accton units. If neither is available to help you, Accton technical  
support engineers are available by fax, mail or phone.  
• Send your technical questions by fax to:  
International Headquarters: 886-3-5770-267  
USA Headquarters: 408-452-8988  
• To obtain software upgrades connect via ftp to ftp.accton.com.tw  
• Send your technical questions by email to [email protected]  
• Mail your technical questions to:  
International Headquarters  
USA Headquarters  
Accton Technology Corporation Accton Technology Corporation  
Attn: Technical Support  
No. 1 Creation Road III  
Attn: Technical Support  
1962 Zanker Road,  
Science-based Industrial Park  
Hsinchu 300, Taiwan, R.O.C.  
San Jose, CA 95112, U.S.A.  
During local business hours, call:  
International Headquarters  
(Monday through Friday,  
8 am to 6 p.m.):  
USA Headquarters  
(Monday through Friday,  
7 am to 5 p.m. Pacific Time):  
408-452-8900 or 800-926-9288  
886-3-5770-270  
Product Support Services  
E-3  
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Fast EtherHub 3500 System User’s Guide  
Limited Warranty  
Accton warrants to the original owner that the product delivered in this package will  
be free from defects in material and workmanship for the lifetime of the product.  
For the warranty to apply, you must register your purchase by returning the  
registration card indicating the date of purchase and including proof of purchase.  
There will be a minimal charge to replace consumable components, such as fuses,  
power transformers, and mechanical cooling devices. The warranty does not cover  
the product if it is damaged in the process of being installed. Accton recommends  
that you have the company from whom you purchased this product install it.  
THE ABOVE WARRANTY IS IN LIEU OF ANY OTHER WARRANTY,  
WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING BUT NOT  
LIMITED TO ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A  
PARTICULAR PURPOSE, OR ANY WARRANTY ARISING OUT OF ANY  
PROPOSAL, SPECIFICATION OR SAMPLE. ACCTON SHALL NOT BE  
LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. ACCTON  
NEITHER ASSUMES NOR AUTHORIZES ANY PERSON TO ASSUME FOR  
IT ANY OTHER LIABILITY.  
Customer Remedies  
If the product is found to be defective within the first two years from the later of date  
of purchase or date of manufacture, Accton’s entire liability and your exclusive  
remedy for any breach of warranty, shall be, at its option, to repair or replace the  
product at no charge except as set forth below. If the product is found to be  
defective after two years from the later of date of purchase or date of manufacture,  
Accton will charge a process and handling fee, provided that you deliver the product  
along with a return material authorization (RMA) number either to the company  
from whom you purchased it or to Accton. Accton warrants the repaired or replaced  
product to be free from defects in material and workmanship for the remainder of the  
original product’s warranty period. Consumable components are warranted only for  
two years.  
E-4  
Product Support Services  
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Fast EtherHub 3500 System User’s Guide  
Return Process  
Before you may return any Accton product to Accton, you must request an RMA  
number by calling, faxing or writing Accton’s Service Department at the address  
listed below. If you ship the product, you must assume the risk of damage or loss in  
transit. You must use the original container (or the equivalent) and pay the shipping  
charge. Accton may replace or repair the product with either a new or  
reconditioned product, and the returned product becomes Accton’s property. At  
Accton’s sole discretion, Accton will issue a credit for either a comparable  
replacement Accton product or credit the original purchase price towards the  
purchase of any Accton product for any unrepairable, defective product.  
This warranty does not cover replacement of products damaged by abuse, accident,  
misuse, neglect, alteration, repair, disaster, improper installation or improper testing.  
ACCTON SHALL NOT BE HELD LIABLE FOR ANY LOSS OF PROFITS,  
LOSS OF USE, INCIDENTAL, CONSEQUENTIAL OR SPECIAL DAMAGES  
CAUSED BY THE USE OF THIS PRODUCT OR INABILITY TO USE IT, EVEN  
IF THE COMPANY OR ACCTON HAS BEEN ADVISED OF SUCH LIABILITY  
OR OTHER SPECIAL CLAIMS.  
If you purchased this product in the USA, be aware that some states do not allow  
limitations on how long an implied warranty lasts, so the above limitations may not  
apply to you. Some states do not allow the exclusion or limitation of incidental or  
consequential damages, so the above limitations or exclusions may not apply to you.  
This warranty gives you specific legal rights and you may have other rights which  
vary from state to state. All parts or components contained in this product are  
covered by Accton’s Limited Lifetime Warranty for this product. The product may  
contain fully tested, recycled parts, warranted as if new.  
For warranty information:  
All territories except North and South America:  
Accton Technology Corporation, International Headquarters  
No. 1, Creation Rd. III, Science-based Industrial Park, Hsinchu 300, Taiwan, R.O.C.  
Phone: 886-3-5770-270 fax: 886-3-5770-267 BBS: 886-3-5770-654  
North and South America:  
Accton Technology Corporation, USA Headquarters  
1962 Zanker Road, San Jose, CA 95112, U.S.A.  
Phone: 408-452-8900  
fax: 408-452-8988  
BBS: 408-452-8828  
Product Support Services  
E-5  
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Fast EtherHub 3500 System User’s Guide  
Accton Offices  
Accton Australia,  
Accton Technology Corporation  
International Headquarters,  
No. 1 Creation Rd. III,  
Science-based Industrial Park,  
Hsinchu 300, Taiwan, R.O.C.  
Hsinchu: Phone: 886-3-5770-270,  
fax: 886-3-5770-267, 886-3-5775-541  
BBS: 886-3-5770-654  
Unit 23, No.27 Doomben Ave.,  
Eastwood, N.S.W. 2122, Australia  
Phone: 612-8582436  
fax: 612-8581723  
Accton Deutschland,  
Bahnhofstr. 6,  
65623 Hahnstatten, Germany  
Phone: 49-64-30-22-17  
fax: 49-64-30-22-70  
Taipei: Phone: 886-2-577-1220 to 9  
fax: 886-2-577-0816  
Accton USA,  
1962 Zanker Road,  
Accton Japan,  
Kano Bldg. 7F,  
San Jose, CA 95112, USA  
Phone: 408-452-8900, 408-452-8080  
fax: 408-452-8988  
BBS: 408-452-8828  
FAST fax: 408-452-8811  
1-25-1 Nishi-Gotanda,  
Shinagawa-ku,  
141 Tokyo, Japan  
Phone: 81-3-3495-1351  
fax: 81-3-3495-1352  
Accton UK,  
The Mill Horton Road,  
Stanwell Moor,  
Staines. Middx. TW19 6BJ United Kingdom  
Phone: 44-1753-687677, 44-1753-680109  
fax: 44-1753-689010  
E-6  
Product Support Services  
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Fast EtherHub 3500 System User’s Guide  
Ordering Information  
• Fast EtherHub-12i  
Intelligent Fast Ethernet Stackable Hub with 12  
100BASE-TX Ports  
(EH3512I-TX)  
•
•
Fast EtherHub-12mi SNMP  
(EH3512M-TX)  
Intelligent Fast Ethernet Stackable Hub with 12  
100BASE-TX Ports; including SNMP  
Managment Support  
SmartExtender Modules  
Slide in module with 1 100BASE-TX,  
100BASE-T4 or 100BASE-FX Uplink Port  
100BASE-TX (EM3551-TX)  
100BASE-T4 (EM3551-T4)  
100BASE-FX (EM3551-FX-SC or  
EM3551-FX-ST)  
The 100BASE-TX module runs at 10 or 100  
Mbps (via auto-detection). The 100BASE-TX  
and 100BASE-FX modules run at half or full  
duplex (via auto-negotiation). See Table E-1.  
•
Redundant Power Supply (EM3550-PWR)  
Serves as a redundant power supply or a  
replacement for the primary power supply.  
•
•
AccView/Open (SW6102)  
Windows-based network management software.  
20cm stack cable with connectors  
FlexBus 3500 Stack Cable (EC3550)  
The operational parameters supported by the different  
SmartExtender modules are shown in the following table.  
Module  
10 Mbps 100 Mbps Half Dulex Full Duplex  
100BASE-TX  
100BASE-T4  
100BASE-FX  
[
[
[
[
[
[
[
[
[
Table E.1 Parameters for SmartExtender Modules  
Product Support Services  
E-7  
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Glossary  
10BASE-T  
IEEE’s specifications for running 10 Mbps Ethernet using twisted-pair cable (100W STP or UTP). The  
maximum length of cable for a point-to-point connection is 100 meters, and the maximum number of  
nodes is 1024.  
100BASE-TX  
IEEE’s specifications for 100 Mbps Ethernet using 2-pairs of Category 5 twisted-pair cable. The Fast  
EtherHub 3500 models require 100W STP or UTP cable. The maximum length of cable for a point-to-  
point connection is 100 meters, and the maximum number of nodes is 1024.  
100BASE-T4  
IEEE’s specifications for 100 Mbps Ethernet using 4-pairs of Category 3, 4 or 5 twisted-pair cable.  
The 100BASE-T4 SmartExtender Module requires 100W STP or UTP cable. The maximum length of  
cable for a point-to-point connection is 100 meters, and the maximum number of nodes is 1024.  
100BASE-FX  
IEEE’s specifications for 100 Mbps Ethernet using multimode fiber optic cable. The 100BASE-FX  
SmartExtender Module must be used to support fiber optic cable with SC or ST type connectors. The  
maximum length for a point-to-point connection is 2 kilometers at full duplex, or 412 meters at half  
duplex.  
AccView/Open  
AccView/Open is a complete network management product with modules for managing Accton  
devices.  
BOOTP  
Boostrap protocol used to load the operating system for devices connected to the network.  
Glossary  
1
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Fast EtherHub 3500 System User’s Guide  
Collision  
A condition in which two packets transmitted over a medium interfere with each other. Their  
interference makes both signals unintelligible. The transmitting devices have to halt transmission for a  
random period of time before trying to send data again. Note that collisions do not occur on full-  
duplex connections.  
Configuration  
The way to set up a computer, server, or local area network.  
Connection  
A logical binding between two or more users of an interconnection service.  
Daisy-Chain Port  
An MDI RJ-45 port used to cascade compatible devices in a daisy-chain configuration using straight-  
through twisted-pair cable. To cascade two devices, either run a connection from the daisy-chain port  
on one device to a station port on the other device, or cascade the two devices by running crossover  
cable between MDI-X station ports on both devices. Remember that this is a Class I Fast Ethernet  
Repeater and cannot be cascaded to another device in the same collision domain.  
Ethernet  
A network communication system developed and standardized by DEC, Intel, and Xerox, using  
baseband transmission, CSMA/CD access, logical bus topology, and coaxial cable. The successor  
IEEE 802.3 standard provides for integration into the OSI model and extends the physical layer and  
media with repeaters and implementations that operate on fiber optics, broadband, and twisted-pair.  
Fast Ethernet  
100 Mbps network communication system based on Ethernet and the CSMA/CD access method.  
Fast EtherHub 3500 System  
Accton’s Fast Ethernet enhancement and management products. Each component in the system carries  
a multi-segment bus architecture that enhances traffic management and network bandwidth utilization.  
File Transfer Protocol (FTP)  
An application protocol used for transferring files to network devices.  
2
Glossary  
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Fast EtherHub 3500 System User’s Guide  
FlexBus Ports  
SCSI ports found at the backplane of the EtherHub labeled In and Out. These ports are used for  
linking the hub to other compatible hubs using Accton’s FlexBus 3500 cable.  
IEEE 802.3 Standard  
Standard for the physical and electrical connections in local area networks developed by the IEEE  
(Institute of Electrical and Electronics Engineers). The IEEE 802.3u standard covers these same issues  
for 100 Mbps networks.  
In-Band  
A way of communicating with a network device via a local network connection.  
Jabber  
Refers to an abnormal Ethernet frame transmission. The frames causing jabber are normally much too  
long. It may come from a malfunctioning Ethernet card and may cause data loss for all network users.  
LED  
Light emitting diode on the front panel of the EtherHub used for monitoring a hub or network  
condition.  
MAC (Media Access Control)  
A portion of the networking protocol that governs access to the transmission medium, facilitating the  
exchange of data between network nodes.  
MDI Port (Medium Dependent Interface)  
MDI is the IEEE standard for the twisted-pair interface to 10BASE-T (or 100BASE-TX) . This RJ-45  
port can be used with straight-through cable to connect the hub to a network interconnection device,  
such a switch. Pin-out assignments are shown in Appendix B.  
MDI-X Port (Medium Dependent Interface - Crossed)  
This RJ-45 port, which crosses the receive and transmit signals internally, can be used with straight-  
through cable to connect the switch to any device that has a standard network interface (e.g.,  
workstation, server or router). Pin-out assignments are shown in Appendix B.  
Glossary  
3
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MIB (Management Information Base)  
An acronym for Management Information Base. It is a set of database objects that contains information  
about the device.  
MII (Media Independent Interface)  
IEEE’s specifications for a multi-media interface that supports 100BASE-TX, 100BASE-T4,  
100BASE-FX or 10BASE-T.  
Multi-Segment Architecture  
Type of architecture that enhances traffic management and network bandwidth utilization by  
segregating network traffic.  
Network Management Station  
The computer used to run SNMP management software (e.g., AccView/Open). It is used by the  
network manager to monitor the network.  
Out-of-Band  
A way of communicating with a network device from outside the standard network channels.  
RJ-45 Connector  
Most common terminator for twisted-pair wiring.  
SLIP (Serial Line Internet Protocol)  
Internet protocol used to transfer IP datagrams over serial lines.  
SNMP (Simple Network Management Protocol)  
The application protocol offering network management services in the Internet suit of protocols.  
Star Topology  
Physical connections for RJ-45 ports are limited to a star configuration (i.e., similar to a hub and spoke  
arrangement). This topology also requires that only one path exists between any two nodes, and that  
data transmitted by any node is concurrently available to all other nodes within the same local network  
(i.e., immediate collision domain).  
4
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Station Port (MDI-X)  
MDI-X ports which are used for connecting the hub to any workstation or server that has a properly  
installed network adapter card. (For port 12, the selector switch must be set toꢀMDI-X.)  
STP (Shielded Twisted-Pair)  
100W Category 5 twisted-pair wire covered with an external aluminum-foil or woven-copper shield  
designed to reduce excessive noise pick up or radiation. The STP cable refered to in this manual is  
also sometimes called screened twisted-pair (ScTP). Its impedance is 100Wand has the same pin  
assignment as UTP. This cable should not be confused with the older 150Wcable type designed by  
IBM.  
UTP (Unshielded Twisted-Pair)  
Cable composed of insulated wires twisted together to reduce electrical interference.  
Xmodem  
A protocol used to transfer files between devices. Data is grouped in 128-bytes blocks and error-  
corrected.  
Glossary  
5
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Index  
Hub ID • 4-23  
Hub Position • 4-23  
A
IPX Frame Type • 4-20  
Link State • 4-26, 4-28  
Partition • 4-26  
Accessing the Configuration Management Program • 4-5  
AccView/Open • 1-4  
Applications  
Segment Assignment • 4-23  
Serial IP • 4-20  
Subnet Mask • 4-20  
Attaching the Stack to Multiple Segments • 3-6  
Attaching the Stack to One Segment • 3-5  
Connecting Remote Stacks • 3-12  
Transmission Speed • 4-28  
Upload Mode • 4-34  
User Type • 4-35  
Configuration Program  
Fast EtherHub-12i • 4-8  
Connecting to the Network Backbone • 3-15  
Extending the Network with Alternate Connections • 3-9  
Interconnecting the Segments • 3-11  
Isolating Each Hub • 3-8  
Isolating Specific Hub Connections • 3-7  
Linking a Stack to a Network Management Station • 3-10  
Operating in Novell NetWare IPX Environment • 3-13  
Operating in TCP/IP Environment • 3-14  
Fast EtherHub-12mi • 4-11  
Stack • 4-11  
Configuring the System • 4-1  
Configuring with the On-board Program • 4-5  
Connecting Fiber-optic Cabling • 2-8  
Connecting the Hub System • 2-4  
Connecting to MDI Daisy-chain Port • 2-6  
Connecting to MDI-X Station Port • 2-4  
Connecting to SmartExtender Module • 2-6  
Connecting to the Stack’s Backplane • 2-5  
Connecting Twisted-pair Cabling • 2-7  
Console Lockout • 4-36  
B
Backup Port Parameters • 4-29  
Bridging Functions • 2-10  
Bytes • 4-37, 4-39  
C
Console Port • see Serial Port  
Cut-through Switching • 1-9  
Collision • 5-8  
Communication Mode  
Selection • 2-10  
D
Setting • 2-10  
Configuration Parameters  
Authorized Port Address • 4-31  
Bootup Option • 4-23  
Community Name • 4-16  
Download Filename • 4-33  
Download Mode • 4-33  
Download Server IP • 4-33  
Gateway IP • 4-20  
Daisy-chain Port • 5-13  
Diagnostic Tests • 2-12  
Disable • 5-10  
Distance Limit and Power Loss in Fiber Optics • 2-8  
Downloading System Software  
TFTP Server • 4-32  
Xmodem Protocol • 4-34  
Half/Full Duplex • 4-28  
Index  
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Fast EtherHub 3500 System User’s Guide  
Isolation • 5-7  
Link • 5-3  
E
Link/Activity • 5-10  
Management Agents • 5-5  
Master • 5-5  
Partition/Disable • 5-9  
Port Status • 5-10  
Power • 5-2  
Rx • 5-3  
Segment • 5-4  
Serial • 5-6  
SmartExtender Module • 5-2  
SNMP • 5-4  
EMI Warning • D-1  
F
Fast EtherHub 3500 • 1-1  
Fast EtherHub-12i • 1-2  
Fast EtherHub-12mi SNMP • 1-3  
FCC Warning • D-1  
Filtering Packets • 1-9  
Flash ROM • 4-33  
FlexBus 3500 Management Link • 3-2  
FlexBus 3500 Ports • 5-16  
Stack In • 5-16  
Terminator • 5-7  
Tx • 5-3  
Utilization • 5-7  
Installation  
Stack Out • 5-16  
Forwarding Packets • 1-9  
Mounting Hubs in a Rack • 2-3  
Stacking Hubs without a Rack • 2-2  
Installing a Backup Power Supply • 2-11  
Installing a SmartExtender Module • 2-7  
Installing an SNMP Backup Agent • 2-14  
Installing the System • 2-1  
Interhub • 5-3  
Internal Management Module • 1-4  
IP Trap Managers • 4-17  
IPX Trap Managers • 4-18  
H
Hardware Installation • 2-1  
Hardware Reference • 5-1  
Hot Remove Function • 2-13  
Hub Configuration • 4-21  
Hub ID Configuration • 4-24  
Hub ID Setting • 3-2  
Hub IDs • 5-5  
Hub Security • 4-30  
Hub Statistics • 4-38  
L
LEDs  
(see Indicators)  
Limited Warranty • E-4  
Link • 5-11  
I
Indicator Panel • 5-2  
Indicators  
Link Indicator • 2-15  
100 • 5-3  
Backup • 5-5  
M
Collision • 5-3, 5-8  
Diagnostic Test Indicators • 5-11  
FDX • 5-3  
Hub ID • 5-5  
Interhub • 5-3  
Management Agents • 3-2  
Management Ports  
(see FlexBus Ports)  
2
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Fast EtherHub 3500 System User’s Guide  
Maximum Segment Length • 2-9  
Multi-segment Architecture • 3-1  
Multiple Agents • 3-3  
Port Intrusion Control • 4-30  
Port Parameters • 4-26  
Port Statistics • 4-39  
Port Status  
Verifying • 2-15  
Ports  
FlexBus • 5-16  
Management Port • 5-14  
MDI • 5-13  
MDI-X • 5-13  
Serial Port • 5-14  
Power Module • 1-4  
N
Network Connection  
MDI Daisy-chain Port • 2-6  
MDI-X Station Port • 2-4  
Verifying • 2-15  
Network Connections • 5-13  
Network Managment Software • 1-4  
Power Supply Modules • 5-15  
Powering on the Hub • 2-12  
Pre-Installation Requirements • 2-1  
Product Features • 1-5, 1-6  
Product Specifications • C-1  
Extender Port • C-2  
O
On-board Configuration Program  
Configuring the Remote Site • 4-4  
Remote Configuration Methods • 4-4  
Remote Out-of-band Connection • 4-4  
Setting Communication Parameters • 4-4  
Ordering Information • E-7  
Repeater Board • C-1  
Repeater Stack • C-2  
Switching Criteria • C-2  
Product Support Services • E-1  
Bulletin Board Service • E-2  
Hardware Repair Service • E-1  
Interactive Fast Fax • E-3  
Software Update and Upgrade Service • E-2  
Technical Support • E-3  
P
Package Contents • i  
Partition • 4-26, 5-9  
Passwords  
Changing • 4-35  
Pin Assignments  
Q
Crossover Cable • B-1  
Hub’s 9-Pin Serial Port to Modem's 25-Pin DCE Port • B-3  
Hub’s 9-Pin Serial Port to PC's 25-Pin DTE Port • B-4  
Hub’s 9-Pin Serial Port to PC's 9-Pin COM Port • B-3  
RJ-45 Port • B-1  
Serial Port • B-2  
Port Attachment  
10BASE-FX • 2-7  
10BASE-T • 2-7  
Quick Installation • iii  
R
Rear Panel • 5-15  
Remote Configuration Methods  
Remote In-band • 4-5  
Remote On-board • 4-4  
Restarting the Agent • 4-13  
10BASE-T4 • 2-7  
10BASE-TX • 2-7  
Port Backup • 3-4  
Index  
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Fast EtherHub 3500 System User’s Guide  
Collisions • 4-37, 4-39, 4-41  
S
CRC Errors • 4-37, 4-39  
Data Rate Mismatch • 4-41  
FCS Errors • 4-41  
Safety Compliance • D-4  
Sample Network Configurations • 3-5  
Security Features  
Frames • 4-37, 4-39  
Frames Too Long • 4-41  
Late Events • 4-41  
Runts • 4-41  
Intrusion Protection • 3-4  
Segment Configuration • 4-19  
Segment Statistics • 4-37  
Segments  
Short Events • 4-41  
Symbol Errors • 4-37, 4-39  
Total Errors • 4-37, 4-39, 4-41  
Interconnecting • 2-11  
Serial Port • 5-6, 5-14  
Setting Up Network Connections • 3-1  
SmartExtender Module • 1-3, 1-9  
Parameters • 4-27  
T
SNMP Agent • 4-15  
Total Bandwidth • 1-6  
Traffic • 5-11  
Transmission Mode  
Selection • 2-10  
Troubleshooting • 5-11, A-1  
Cabling • A-3  
Configuration • A-4  
Hub Indicators • A-1  
Installation • A-2  
SNMP Backup Agent • 3-3  
SNMP Communities • 4-16  
Stack Termination • 5-7  
Station Ports • 5-13  
Statistics  
Hub • 4-38  
Port • 4-39  
Repeater Ports • 4-40  
Segment • 4-37  
SmartExtender Module • 4-42  
Switching Functions • 2-10  
Switching Methods • 1-10  
Switching Technology • 1-9  
System Information • 4-14  
System Configuration  
Setting Up Connections for • 4-1  
System Configuration Options  
Direct Connection • 4-2  
Local In-band Network Connection • 4-3  
Local In-band Telnet Connection • 4-3  
Network Connection • 4-2  
Remote Connection • 4-4  
System Operation  
Power and Cooling • A-2  
Twisted-pair Cable  
Category 3,4,5 • 2-4, A-3  
U
Using the System Configuration Program • 4-7  
Utilization • 5-7  
Verifying • 2-15  
System Statistics  
Allignment Errors • 4-37, 4-39, 4-41  
Auto Partitions • 4-41  
4
Index  
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EH3512I-TX  
EH3512M-TX  
E1296-R01  
150136-101  
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