Milan Technology Switch MIL SM4804G User Manual
48 10/100 Ports  
+ 2 Combo SFP Gigabit Ports  
+ 2 10/100/1000 Gigabit Ports  
Multi-Layer Stackable Management Switch  
MIL-SM4804G  
Quick Installation Guide  
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Quick Installation Guide  
48 10/100 Ports + 2Combo SFP + 2 Gigabit Copper  
Multi-Layer Stackable Management Switch  
Layer 2 Stackable Switch with  
50 100BASE-TX (RJ-45) Ports,  
and 2 Gigabit Combination Ports (RJ-45/SFP)  
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MIL-SM4804G  
90000444 REV A  
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Regulatory Approval  
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FCC Class A  
UL 60950  
CSA C22.2 No. 60950  
EN60950  
CE  
EN55022 Class A  
EN55024  
Canadian EMI Notice  
This Class A digital apparatus meets all the requirements of the Canadian Interfer-  
ence-Causing Equipment Regulations  
Cet appareil numerique de la classe A respecte toutes les exigences du Regle-  
ment sur le materiel brouilleur du Canada.  
European Notice  
Products with the CE Marking comply with both the EMC Directive (89/336/EEC)  
and the Low Voltage Directive (73/23/EEC) issued by the Commission of the Euro-  
pean Community Compliance with these directives imply conformity to the follow-  
ing European Norms:  
•
•
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EN55022 (CISPR 22) - Radio Frequency Interference  
EN61000-X - Electromagnetic Immunity  
EN60950 (IEC950) - Product Safety  
Five-Year Limited Warranty  
MiLAN Technology warrants to the original consumer or purchaser that each of  
it's products, and all components thereof, will be free from defects in material  
and/or workmanship for a period of five years from the original factory shipment  
date. Any warranty hereunder is extended to the original consumer or purchaser  
and is not assignable.  
MiLAN Technology makes no express or implied warranties including, but not lim-  
ited to, any implied warranty of merchantability or fitness for a particular purpose,  
except as expressly set forth in this warranty. In no event shall MiLAN Technology  
be liable for incidental or consequential damages, costs, or expenses arising out  
of or in connection with the performance of the product delivered hereunder.  
MiLAN Technology will in no case cover damages arising out of the product being  
used in a negligent fashion or manner.  
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Trademarks  
The MiLAN logo and MiLAN Technology trademarks are registered trademarks of  
MiLAN Technology in the  
United States and/or other countries.  
To Contact MiLAN Technology  
For prompt response when calling for service information, have the following infor-  
mation ready:  
- Product serial number and revision  
- Date of purchase  
- Vendor or place of purchase  
You can reach MiLAN Technology technical support at:  
E-mail: [email protected]  
Telephone: +1.408.744.2751  
Fax: +1.408.744.2771  
MiLAN Technology  
1329 Moffett Park Drive  
Sunnyvale, CA 94089  
United States of America  
Telephone: +1.408.744.2775  
Fax: +1.408.744.2793  
http://www.milan.com  
[email protected]  
© Copyright 2005 MiLAN Technology P/N: 90000433 Rev. A  
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Compliances and Safety Warnings  
CE Mark Declaration of Conformance for EMI and Safety (EEC)  
This information technology equipment complies with the requirements of the Council  
Directive 89/336/EEC on the Approximation of the laws of the Member States relating to  
Electromagnetic Compatibility and 73/23/EEC for electrical equipment used within certain  
voltage limits and the Amendment Directive 93/68/EEC. For the evaluation of the  
compliance with these Directives, the following standards were applied:  
RFI Emission:  
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Limit class A according to EN 55022:1998  
Limit class A for harmonic current emission according to EN 61000-3-2/1995  
Limitation of voltage fluctuation and flicker in low-voltage supply system  
according to EN 61000-3-3/1995  
Immunity:  
•
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Product family standard according to EN 55024:1998  
Electrostatic Discharge according to EN 61000-4-2:1995  
(Contact Discharge: ±4 kV, Air Discharge: ±8 kV)  
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Radio-frequency electromagnetic field according to EN 61000-4-3:1996  
(80 - 1000 MHz with 1 kHz AM 80% Modulation: 3 V/m)  
Electrical fast transient/burst according to EN 61000-4-4:1995 (AC/DC power  
supply: ±1 kV, Data/Signal lines: ±0.5 kV)  
Surge immunity test according to EN 61000-4-5:1995  
(AC/DC Line to Line: ±1 kV, AC/DC Line to Earth: ±2 kV)  
Immunity to conducted disturbances, Induced by radio-frequency fields:  
EN 61000-4-6:1996 (0.15 - 80 MHz with 1 kHz AM 80% Modulation: 3 V/m)  
Power frequency magnetic field immunity test according to  
EN 61000-4-8:1993  
(1 A/m at frequency 50 Hz)  
•
•
Voltage dips, short interruptions and voltage variations immunity test  
according to EN 61000-4-11:1994 (>95% Reduction @10 ms, 30%  
Reduction @500 ms, >95% Reduction @5000 ms)  
LVD:  
EN 60950-1:2001  
Caution: Do not plug a phone jack connector in the RJ-45 port. This may damage this  
device.  
Attention: Les raccordeurs ne sont pas utilisés pour le système téléphonique!  
iii  
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Safety Compliance  
Warning: Fiber Optic Port Safety  
When using a fiber optic port, never look at the transmit laser while it is  
powered on. Also, never look directly at the fiber TX port and fiber cable  
ends when they are powered on.  
CLASS I  
LASER DEVICE  
Avertissment: Ports pour fibres optiques - sécurité sur le plan optique  
Ne regardez jamais le laser tant qu'il est sous tension. Ne regardez  
jamais directement le port TX (Transmission) à fibres optiques et les  
embouts de câbles à fibres optiques tant qu'ils sont sous tension.  
DISPOSITIF LASER  
DE CLASSE I  
Warnhinweis: Faseroptikanschlüsse - Optische Sicherheit  
Niemals ein Übertragungslaser betrachten, während dieses  
eingeschaltet ist. Niemals direkt auf den Faser-TX-Anschluß  
und auf die Faserkabelenden schauen, während diese  
LASERGERÄT  
DER KLASSE I  
eingeschaltet sind.  
Please read the following safety information carefully before  
installing the switch:  
WARNING: Installation and removal of the unit must be carried out by qualified personnel  
only.  
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The unit must be connected to an earthed (grounded) outlet to comply with international  
safety standards.  
Do not connect the unit to an A.C. outlet (power supply) without an earth (ground)  
connection.  
The appliance coupler (the connector to the unit and not the wall plug) must have a  
configuration for mating with an EN 60320/IEC 320 appliance inlet.  
The socket outlet must be near to the unit and easily accessible. You can only remove  
power from the unit by disconnecting the power cord from the outlet.  
• This unit operates under SELV (Safety Extra Low Voltage) conditions according to  
IEC 60950. The conditions are only maintained if the equipment to which it is connected  
also operates under SELV conditions.  
France and Peru only  
This unit cannot be powered from IT supplies. If your supplies are of IT type, this unit  
†
must be powered by 230 V (2P+T) via an isolation transformer ratio 1:1, with the  
secondary connection point labelled Neutral, connected directly to earth (ground).  
†
Impédance à la terre  
•
iv  
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Power Cord Set  
U.S.A. and Canada  
The cord set must be UL-approved and CSA certified.  
The minimum specifications for the flexible cord are:  
- No. 18 AWG - not longer than 2 meters, or 16 AWG.  
- Type SV or SJ  
- 3-conductor  
The cord set must have a rated current capacity of at least 10 A  
The attachment plug must be an earth-grounding type with NEMA  
5-15P (15 A, 125 V) or NEMA 6-15P (15 A, 250 V) configuration.  
Denmark  
The supply plug must comply with Section 107-2-D1, Standard  
DK2-1a or DK2-5a.  
Switzerland  
U.K.  
The supply plug must comply with SEV/ASE 1011.  
The supply plug must comply with BS1363 (3-pin 13 A) and be fitted  
with a 5 A fuse which complies with BS1362.  
The mains cord must be <HAR> or <BASEC> marked and be of type  
HO3VVF3GO.75 (minimum).  
Europe  
The supply plug must comply with CEE7/7 (“SCHUKO”).  
The mains cord must be <HAR> or <BASEC> marked and be of type  
HO3VVF3GO.75 (minimum).  
IEC-320 receptacle.  
Veuillez lire à fond l'information de la sécurité suivante avant  
d'installer le Switch:  
AVERTISSEMENT: L’installation et la dépose de ce groupe doivent être confiés à un  
personnel qualifié.  
•
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Ne branchez pas votre appareil sur une prise secteur (alimentation électrique) lorsqu'il  
n'y a pas de connexion de mise à la terre (mise à la masse).  
Vous devez raccorder ce groupe à une sortie mise à la terre (mise à la masse) afin de  
respecter les normes internationales de sécurité.  
Le coupleur d’appareil (le connecteur du groupe et non pas la prise murale) doit  
respecter une configuration qui permet un branchement sur une entrée d’appareil EN  
60320/IEC 320.  
•
•
La prise secteur doit se trouver à proximité de l’appareil et son accès doit être facile.  
Vous ne pouvez mettre l’appareil hors circuit qu’en débranchant son cordon électrique  
au niveau de cette prise.  
L’appareil fonctionne à une tension extrêmement basse de sécurité qui est conforme à  
la norme IEC 60950. Ces conditions ne sont maintenues que si l’équipement auquel il  
est raccordé fonctionne dans les mêmes conditions.  
v
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France et Pérou uniquement:  
Ce groupe ne peut pas être alimenté par un dispositif à impédance à la terre. Si vos  
alimentations sont du type impédance à la terre, ce groupe doit être alimenté par une  
tension de 230 V (2 P+T) par le biais d’un transformateur d’isolement à rapport 1:1, avec  
un point secondaire de connexion portant l’appellation Neutre et avec raccordement  
direct à la terre (masse).  
Cordon électrique - Il doit être agréé dans le pays d’utilisation  
Etats-Unis et  
Canada:  
Le cordon doit avoir reçu l’homologation des UL et un certificat de la  
CSA.  
Les spe'cifications minimales pour un cable flexible sont AWG No.  
18, ouAWG No. 16 pour un cable de longueur infe'rieure a` 2 me'tres.  
- type SV ou SJ  
- 3 conducteurs  
Le cordon doit être en mesure d’acheminer un courant nominal d’au  
moins 10 A.  
La prise femelle de branchement doit être du type à mise à la terre  
(mise à la masse) et respecter la configuration NEMA 5-15P (15 A,  
125 V) ou NEMA 6-15P (15 A, 250 V).  
Danemark:  
La prise mâle d’alimentation doit respecter la section 107-2 D1 de la  
norme DK2 1a ou DK2 5a.  
Suisse:  
Europe  
La prise mâle d’alimentation doit respecter la norme SEV/ASE 1011.  
La prise secteur doit être conforme aux normes CEE 7/7 (“SCHUKO”)  
LE cordon secteur doit porter la mention <HAR> ou <BASEC> et doit  
être de type HO3VVF3GO.75 (minimum).  
Bitte unbedingt vor dem Einbauen des Switches die folgenden  
Sicherheitsanweisungen durchlesen:  
WARNUNG: Die Installation und der Ausbau des Geräts darf nur durch Fachpersonal  
erfolgen.  
•
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•
Das Gerät sollte nicht an eine ungeerdete Wechselstromsteckdose angeschlossen  
werden.  
Das Gerät muß an eine geerdete Steckdose angeschlossen werden, welche die  
internationalen Sicherheitsnormen erfüllt.  
Der Gerätestecker (der Anschluß an das Gerät, nicht der Wandsteckdosenstecker) muß  
einen gemäß EN 60320/IEC 320 konfigurierten Geräteeingang haben.  
Die Netzsteckdose muß in der Nähe des Geräts und leicht zugänglich sein. Die  
Stromversorgung des Geräts kann nur durch Herausziehen des Gerätenetzkabels aus  
der Netzsteckdose unterbrochen werden.  
•
Der Betrieb dieses Geräts erfolgt unter den SELV-Bedingungen  
(Sicherheitskleinstspannung) gemäß IEC 60950. Diese Bedingungen sind nur  
gegeben, wenn auch die an das Gerät angeschlossenen Geräte unter  
SELV-Bedingungen betrieben werden.  
vi  
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Stromkabel. Dies muss von dem Land, in dem es benutzt wird geprüft werden:  
Schweiz  
Dieser Stromstecker muß die SEV/ASE 1011Bestimmungen einhalt-  
en.  
Europe  
Das Netzkabel muß vom Typ HO3VVF3GO.75 (Mindestanforderung)  
sein und die Aufschrift <HAR> oder <BASEC> tragen.  
Der Netzstecker muß die Norm CEE 7/7 erfüllen (”SCHUKO”).  
Warnings and Cautionary Messages  
Warning: This product does not contain any serviceable user parts.  
Warning: Installation and removal of the unit must be carried out by qualified  
personnel only.  
Warning: When connecting this device 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.  
Warning: This switch uses lasers to transmit signals over fiber optic cable. The lasers  
are compliant with the requirements of a Class 1 Laser Product and are  
inherently eye safe in normal operation. However, you should never look  
directly at a transmit port when it is powered on.  
Caution: Wear an anti-static wrist strap or take other suitable measures to prevent  
electrostatic discharge when handling this equipment.  
Caution: Do not plug a phone jack connector in the RJ-45 port. This may damage this  
device. Les raccordeurs ne sont pas utilisé pour le système téléphonique!  
Caution: Use only twisted-pair cables with RJ-45 connectors that conform to FCC  
standards.  
Warnings (in German)  
Achtung: Dieses Produkt enthält keine Teile, die eine Wartung vom Benutzer  
benötigen.  
Achtung: Installation und Deinstallation des Gerätes müssen von qualifiziertem  
Servicepersonal durchgeführt werden.  
Achtung: Wenn das Gerät an eine Steckdose angeschlossen wird, muß der  
Masseanschluß am dreipoligen Netzstecker mit Schutzerde verbunden  
werden, um elektrische Gefahren zu vermeiden.  
Achtung: Dieses Gerät nutzt Laser zur Signalübertragung über Glasfasern. Die Laser  
entsprechen den Anforderungen an eine Lasereinrichtung der Klasse 1 und  
sind durch ihre Bauart im normalen Betrieb sicher für die Augen. Trotzdem  
sollte niemals direkt in den einen Übertragungskanal geblickt werden, wenn  
er eingeschaltet ist.  
vii  
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Environmental Statement  
The manufacturer of this product endeavours to sustain an environmentally-friendly policy  
throughout the entire production process. This is achieved though the following means:  
•
Adherence to national legislation and regulations on environmental production  
standards.  
•
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•
Conservation of operational resources.  
Waste reduction and safe disposal of all harmful un-recyclable by-products.  
Recycling of all reusable waste content.  
Design of products to maximize recyclables at the end of the product’s life span.  
Continual monitoring of safety standards.  
End of Product Life Span  
This product is manufactured in such a way as to allow for the recovery and disposal of all  
included electrical components once the product has reached the end of its life.  
Manufacturing Materials  
There are no hazardous nor ozone-depleting materials in this product.  
Documentation  
All printed documentation for this product uses biodegradable paper that originates from  
sustained and managed forests. The inks used in the printing process are non-toxic.  
Purpose  
This guide details the hardware features of the switch, including Its physical and  
performance-related characteristics, and how to install the switch.  
Audience  
This guide is for system administrators with a working knowledge of network  
management. You should be familiar with switching and networking concepts.  
Zielgruppe Dieser Anleitung ist fuer Systemadministratoren mit Erfahrung im  
Netzwerkmangement. Sie sollten mit Switch- und Netzwerkkonzepten vertraut sein.  
Related Publications  
The following publication gives specific information on how to operate and use the  
management functions of the switch:  
The Stackable Fast Ethernet Switch Management Guide  
Also, as part of the switch’s firmware, there is an online web-based help that describes all  
management related features.  
viii  
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Contents  
Chapter 1: Introduction  
1-1  
Overview  
1-1  
1-2  
1-2  
1-2  
1-2  
1-3  
1-4  
1-5  
1-7  
1-7  
1-7  
1-7  
1-8  
1-8  
Switch Architecture  
Network Management Options  
Description of Hardware  
10BASE-T/100BASE-TX Ports  
1000BASE-T/SFP Ports  
Stacking Ports  
Port and System Status LEDs  
Power Supply Receptacles  
Features and Benefits  
Connectivity  
Expandability  
Performance  
Management  
Chapter 2: Network Planning  
2-1  
Introduction to Switching  
Application Examples  
Collapsed Backbone  
Network Aggregation Plan  
Remote Connections with Fiber Cable  
Making VLAN Connections  
Application Notes  
2-1  
2-2  
2-2  
2-3  
2-4  
2-5  
2-6  
Chapter 3: Installing the Switch  
3-1  
Selecting a Site  
Ethernet Cabling  
Equipment Checklist  
Package Contents  
Optional Rack-Mounting Equipment  
Mounting  
Rack Mounting  
Desktop or Shelf Mounting  
Installing an Optional SFP Transceiver  
Connecting Switches in a Stack  
Connecting to a Power Source  
Connecting to the Console Port  
Wiring Map for Serial Cable  
3-1  
3-1  
3-2  
3-2  
3-2  
3-3  
3-3  
3-5  
3-6  
3-6  
3-8  
3-9  
3-9  
ix  
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Contents  
Chapter 4: Making Network Connections  
4-1  
Connecting Network Devices  
Twisted-Pair Devices  
Cabling Guidelines  
Connecting to PCs, Servers, Hubs and Switches  
Network Wiring Connections  
4-1  
4-1  
4-1  
4-2  
4-2  
4-4  
4-5  
4-5  
4-6  
4-6  
4-6  
4-7  
Fiber Optic SFP Devices  
Connectivity Rules  
1000BASE-T Cable Requirements  
1000 Mbps Gigabit Ethernet Collision Domain  
100 Mbps Fast Ethernet Collision Domain  
10 Mbps Ethernet Collision Domain  
Cable Labeling and Connection Records  
Appendix A: Troubleshooting A-1  
Diagnosing Switch Indicators  
Diagnosing Power Problems with the LEDs  
Power and Cooling Problems  
Installation  
In-Band Access  
Stack Troubleshooting  
A-1  
A-1  
A-2  
A-2  
A-2  
A-2  
Appendix B: Cables B-1  
Twisted-Pair Cable and Pin Assignments  
10BASE-T/100BASE-TX Pin Assignments  
Straight-Through Wiring  
Crossover Wiring  
1000BASE-T Pin Assignments  
Fiber Standards  
B-1  
B-1  
B-2  
B-2  
B-3  
B-4  
Appendix C: Specifications C-1  
Switch Features  
Management Features  
Standards  
C-2  
C-2  
C-3  
C-3  
Compliances  
Glossary  
Index  
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Tables  
Table 1-1  
Table 1-2  
Table 3-1  
Table 4-1  
Table 4-2  
Table 4-3  
Table 4-4  
Table 4-5  
Table 4-6  
Table A-1  
Table A-2  
Table B-1  
Table B-2  
Port Status LEDs  
System Status LEDs  
Serial Cable Wiring  
Maximum 1000BASE-T Gigabit Ethernet Cable Length  
Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths  
Maximum 1000BASE-LX Gigabit Ethernet Cable Length  
Maximum 1000BASE-LH Gigabit Ethernet Cable Length  
Maximum Fast Ethernet Cable Length  
Maximum Ethernet Cable Length  
Troubleshooting Chart  
Power/RPS LEDs  
10/100BASE-TX MDI and MDI-X Port Pinouts  
1000BASE-T MDI and MDI-X Port Pinouts  
1-5  
1-6  
3-9  
4-6  
4-6  
4-6  
4-6  
4-6  
4-6  
A-1  
A-1  
B-2  
B-3  
xi  
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Figures  
Figure 1-1  
Figure 1-2  
Figure 1-3  
Figure 1-4  
Figure 1-5  
Figure 2-1  
Figure 2-2  
Figure 2-3  
Figure 2-4  
Figure 3-1  
Figure 3-2  
Figure 3-3  
Figure 3-4  
Figure 3-5  
Figure 3-6  
Figure 3-7  
Figure 3-8  
Figure 4-1  
Figure 4-2  
Figure 4-3  
Figure B-1  
Figure B-2  
Figure B-3  
Front and Rear Panels  
Stacking Ports  
Port LEDs  
System LEDs  
Power Supply Receptacles  
Collapsed Backbone  
Network Aggregation Plan  
Remote Connections with Fiber Cable  
Making VLAN Connections  
RJ-45 Connections  
1-1  
1-4  
1-5  
1-6  
1-7  
2-2  
2-3  
2-4  
2-5  
3-2  
3-3  
3-4  
3-5  
3-6  
3-7  
3-8  
3-9  
4-2  
4-3  
4-5  
B-1  
B-2  
B-3  
Attaching the Brackets  
Installing the Switch in a Rack  
Attaching the Adhesive Feet  
Installing an SFP Transceiver into a slot  
Connecting Switches in a Ring-topology Stack  
Power Receptacles  
Serial Port (DB-9 DTE) Pin-Out  
Making Twisted-Pair Connections  
Network Wiring Connections  
Making Fiber Port Connections  
RJ-45 Connector Pin Numbers  
Straight-through Wiring  
Crossover Wiring  
xii  
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Chapter 1: Introduction  
Overview  
The MIL-SM4804G switch is a stackable Fast Ethernet switch with 48 10BASE-T/  
1
100BASE-TX ports, and two 1000BASE-T ports that operate in combination with  
two Small Form Factor Pluggable (SFP) transceiver slots. These switches also  
provide two 1 Gbps built-in stacking ports for connecting up to four MIL-SM4804G  
units in a stack. The stacking ports can also be used as normal Ethernet ports in  
standalone mode. The switch also includes an SNMP-based management agent,  
which provides both in-band and out-of-band access for managing the switch.  
The MIL-SM4804G provides a broad range of powerful features for Layer 2  
switching, delivering reliability and consistent performance for your network traffic.  
They bring order to poorly performing networks by segregating them into separate  
broadcast domains with IEEE 802.3Q compliant VLANs, and empowers multimedia  
applications with multicast switching and CoS services.  
Port Status Indicators  
System Indicators  
Stacking Ports  
10/100 Mbps RJ-45 Ports  
1000BASE-T/SFP Ports  
RPS  
Console  
DC  
12V 4.5A  
Console Port  
Power Socket  
Redundant Power Socket  
Figure 1-1 Front and Rear Panels  
1. If an SFP transceiver is plugged in, the corresponding RJ-45 port (25-26 or 49-50) is disabled.  
1-1  
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Introduction  
1
Switch Architecture  
2
The MIL-SM4804G employs a wire-speed, non-blocking switching fabric . This  
permits simultaneous wire-speed transport of multiple packets at low latency on all  
ports. The switches also features full-duplex capability on all ports, which effectively  
doubles the bandwidth of each connection.  
The switches uses store-and-forward switching to ensure maximum data integrity.  
With store-and-forward switching, the entire packet must be received into a buffer  
and checked for validity before being forwarded. This prevents errors from being  
propagated throughout the network.  
The switches include built-in stacking ports that allow multiple units to connected  
together through a 4 Gbps stack backplane. The switch stack can be managed from  
a master unit using a single IP address.  
Network Management Options  
With a comprehensive array of LEDs, the MIL-SM4804G switch provides “at a  
glance” monitoring of network and port status. The switches can be managed over  
the network with a web browser or Telnet application, or via a direct connection to  
the console port. The switches includes a built-in network management agent that  
allows them to be managed in-band using SNMP or RMON (Groups 1, 2, 3, 9)  
protocols. They also have an RS-232 serial port (DB-9 connector) on the front panel  
for out-of-band management. A PC may be connected to this port for configuration  
and monitoring out-of-band via a null-modem serial cable. (See Appendix B for wiring  
options.)  
For a detailed description of the advanced features, refer to the Management Guide.  
Description of Hardware  
10BASE-T/100BASE-TX Ports  
The MIL-SM4804G switch contains 48 10BASE-T/100BASE-TX RJ-45 ports. All  
ports support automatic MDI/MDI-X operation, so you can use straight-through  
cables for all network connections to PCs or servers, or to other switches or hubs.  
(See “10BASE-T/100BASE-TX Pin Assignments” on page B-1.)  
Each of these ports support auto-negotiation, so the optimum transmission mode  
(half or full duplex), and data rate (10 or 100 Mbps) can be selected automatically. If  
a device connected to one of these ports does not support auto-negotiation, the  
communication mode of that port can be configured manually.  
2. Non-blocking switching is used for traffic crossing ports attached to the same switch ASIC;  
while blocking is employed for traffic passing between different switch chips. The  
MIL-SM4804G has two switch chips – ASIC#1: Ports 1-12, 25-36, 49, 51 and ASIC#2: Ports  
13-24, 37-48, 50, 52.  
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Description of Hardware  
1
3
Each port also supports IEEE 802.3x auto-negotiation of flow control , so the switch  
can automatically prevent port buffers from becoming saturated.  
1000BASE-T/SFP Ports  
These are combination Gigabit RJ-45 ports with shared Small Form Factor  
Pluggable (SFP) transceiver slots (See Figure 1-1, Ports 25-26/49-50). If an SFP  
transceiver (purchased separately) is installed in a slot and has a valid link on the  
port, the associated RJ-45 port is disabled.  
The 1000BASE-T RJ-45 ports support automatic MDI/MDI-X operation, so you can  
use straight-through cables for all network connections to PCs or servers, or to other  
switches or hubs. (See “1000BASE-T Pin Assignments” on page B-3.)  
3. Flow control is only supported for ports attached to the same switch ASIC. The MIL-SM4804G  
has two switch chips– ASIC#1: Ports 1-12, 25-36, 49, 51 and ASIC#2: Ports 13-24, 37-48, 50,  
52.  
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Introduction  
1
Stacking Ports  
The unit provides two stacking ports that provide a 4 Gbps stack backplane  
connection. You can stack up to four MIL-SM4804G units using Category 5 Ethernet  
cables (purchased separately). The Master button enables one switch in the stack to  
be selected as the master. This is the unit through which you manage the entire  
stack.  
The stacking ports can also be used as normal Ethernet ports in standalone mode  
by pressing the Uplink button.  
Master Button  
Uplink Button  
Stacking Ports  
Figure 1-2 Stacking Ports  
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Description of Hardware  
1
Port and System Status LEDs  
The MIL-SM4804G includes a display panel for key system and port indications that  
simplify installation and network troubleshooting. The LEDs, which are located on  
the front panel for easy viewing, are shown below and described in the following  
tables.  
Port Status LEDs  
4
5
6
9
1
2
3
8
10  
11 12  
7
Figure 1-3 Port LEDs  
Table 1-1 Port Status LEDs  
Status  
LED  
Condition  
Fast Ethernet Ports  
MIL-SM4804G: Ports 1-48  
(Link/Activity)  
On/Flashing  
Amber  
Port has established a valid 10 Mbps network connection.  
Flashing indicates activity.  
On/Flashing  
Green  
Port has established a valid 100 Mbps network connection.  
Flashing indicates activity.  
Off  
There is no valid link on the port.  
Flashing Green  
When the “light unit” command is entered in the Command Line  
Interface, the LED corresponding to the switch’s ID will flash for  
about 15 seconds.  
Gigabit Ethernet Ports  
MIL-SM4804G: Ports 49-50, and Ports 51-52 when stacking is not implemented  
(Link/Activity)  
On/Flashing  
Amber  
Port has established a valid 10/100 Mbps network connection.  
Flashing indicates activity.  
On/Flashing  
Green  
Port has established a valid 1000 Mbps network connection.  
Flashing indicates activity.  
Off  
There is no valid link on the port.  
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Introduction  
1
System LEDs  
Figure 1-4 System LEDs  
Table 1-2 System Status LEDs  
Status  
LED  
Condition  
On Green  
On Amber  
Off  
PWR  
The unit’s internal power supply is operating normally.  
The unit’s internal power supply has failed.  
The unit has no power connected.  
Diag  
On Green  
Flashing Green  
On Amber  
Green  
The system diagnostic test has completed successfully.  
The system diagnostic test is in progress.  
The system diagnostic test has detected a fault.  
A redundant power supply is attached and is active.  
A redundant power supply is attached but not active.  
There is no redundant power supply currently attached.  
RPS  
Amber  
Off  
Stack Master  
Flashing Amber  
An initial power-on state during which the stack  
configuration is detected.  
Green  
Amber  
Off  
This switch is acting as the Master unit in the stack.  
This switch is acting as a Slave unit in the stack.  
Switch is operating in standalone mode.  
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Features and Benefits  
1
Power Supply Receptacles  
There are two power receptacles on the rear panel of the switch. The standard  
power receptacle is for the AC power cord. The receptacle labeled “RPS” is for the  
optional Redundant Power Supply (RPS).  
RPS  
DC  
12V 4.5A  
100-240V~ 50-60Hz 2A  
Figure 1-5 Power Supply Receptacles  
Features and Benefits  
Connectivity  
•
•
48 (MIL-SM4804G) 100BASE-TX ports, 2 1000BASE-T ports, and 2 combination  
1000BASE-T/SFP ports for easy integration and for protection of your investment  
in legacy LAN equipment.  
Auto-negotiation enables each RJ-45 port to automatically select the optimum  
speed (10, 100 or 1000 Mbps), and the communication mode (half or full duplex)  
if this feature is supported by the attached device; otherwise the port can be  
configured manually.  
•
•
100BASE-TX and 1000BASE-T RJ-45 ports support auto MDI/MDI-X pinout  
configuration.  
Unshielded (UTP) cable supported on all RJ-45 ports: Category 3 or better for  
10 Mbps connections, Category 5 or better for 100 Mbps connections, and  
Category 5, 5e or 6 for 1000 Mbps connections.  
•
•
IEEE 802.3-2002 Ethernet, Fast Ethernet, Gigabit Ethernet compliance ensures  
compatibility with standards-based hubs, network cards and switches from any  
vendor.  
Provides stacking capability via RJ-45 ports with 4 Gbps stacking bandwidth. You  
can connect up to four MIL-SM4804G units in a stack.  
Expandability  
• 2 Small Form Factor Pluggable (SFP) transceiver slots (shared with 1000BASE-T  
ports)  
• Supports 1000BASE-SX, 1000BASE-LX, and 1000BASE-LH SFP transceivers.  
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Introduction  
1
Performance  
•
•
•
•
•
•
Transparent bridging  
Aggregate duplex bandwidth of 17.6 Gbps (MIL-SM4804G)  
Switching table with a total of 8K MAC address entries  
Provides store-and-forward switching  
Wire-speed filtering and forwarding  
Supports flow control, using back pressure for half duplex and IEEE 802.3x for full  
duplex  
•
Broadcast storm control  
Management  
•
“At-a-glance” LEDs for easy troubleshooting  
•
Network management agent:  
-
-
Manages switch in-band or out-of-band  
Supports SSH, Telnet, SNMP, RMON (4 groups) and web-based interface  
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Chapter 2: Network Planning  
Introduction to Switching  
A network switch allows simultaneous transmission of multiple packets via  
non-crossbar switching. This means that it can partition a network more efficiently  
than bridges or routers. The switch has, therefore, been recognized as one of the  
most important building blocks for today’s networking technology.  
When performance bottlenecks are caused by congestion at the network access  
point (such as the network card for a high-volume file server), the device  
experiencing congestion (server, power user, or hub) can be attached directly to a  
switched port. And, by using full-duplex mode, the bandwidth of the dedicated  
segment can be doubled to maximize throughput.  
When networks are based on repeater (hub) technology, the distance between end  
stations is limited by a maximum hop count. However, a switch turns the hop count  
back to zero. So subdividing the network into smaller and more manageable  
segments, and linking them to the larger network by means of a switch, removes this  
limitation.  
A switch can be easily configured in any Ethernet, Fast Ethernet, or Gigabit Ethernet  
network to significantly boost bandwidth while using conventional cabling and  
network cards.  
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Network Planning  
2
Application Examples  
The MIL-SM4804G switch is not only designed to segment your network, but also to  
provide a wide range of options in setting up network connections. Some typical  
applications are described below.  
Collapsed Backbone  
The MIL-SM4804G is an excellent choice for mixed Ethernet, Fast Ethernet, and  
Gigabit Ethernet installations where significant growth is expected in the near future.  
You can easily build on this basic configuration, adding direct full-duplex  
connections to workstations or servers. When the time comes for further expansion,  
just connect to another hub or switch using one of the Fast Ethernet or Gigabit  
Ethernet ports.  
In the figure below, the switch is operating as a collapsed backbone for a small LAN.  
It is providing dedicated 10 Mbps full-duplex connections to workstations, 100 Mbps  
full-duplex connections to power users, and 1 Gbps full-duplex connections to  
servers.  
...  
...  
...  
Servers  
1 Gbps  
Full Duplex  
Workstations  
100 Mbps  
Full Duplex  
Workstations  
10 Mbps  
Full Duplex  
Figure 2-1 Collapsed Backbone  
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Application Examples  
2
Network Aggregation Plan  
When used in standalone mode, the MIL-SM4804G provides 52 parallel bridging  
ports (i.e., 52 distinct collision domains), which can be used to collapse a complex  
network down into a single efficient bridged node, increasing overall bandwidth and  
throughput.  
You can stack up to four MIL-SM4804G switch units together, forming a single  
“virtual” switch containing up to 200 ports. The whole stack can be managed through  
the Master unit using a single IP address.  
In the figure below, the 10BASE-T/100BASE-TX ports on the MIL-SM4804G switch  
are providing 100 Mbps connectivity for up to 24 segments. In addition, the switch is  
also connecting several servers at 1000 Mbps.  
Stacked Units  
1000 Mbps  
Segments  
10/100 Mbps  
Segments  
...  
...  
Server Farm  
Figure 2-2 Network Aggregation Plan  
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Network Planning  
2
Remote Connections with Fiber Cable  
Fiber optic technology allows for longer cabling than any other media type. A  
1000BASE-SX (MMF) link can connect to a site up to 550 meters away, a  
1000BASE-LX (SMF) link up to 5 km, and a 1000BASE-LH link up to 70 km. This  
allows a Gigabit Ethernet Switch to serve as a collapsed backbone, providing direct  
connectivity for a widespread LAN.  
The figure below illustrates this switch connecting multiple segments with fiber  
cable.  
Headquarters  
1000BASE-LH SMF  
(70 kilometers)  
Server Farm  
1000BASE-LX SMF  
(5 kilometers)  
Remote Switch  
Remote Switch  
10/100 Mbps Segments  
...  
...  
Figure 2-3 Remote Connections with Fiber Cable  
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Application Examples  
2
Making VLAN Connections  
This switch supports VLANs which can be used to organize any group of network  
nodes into separate broadcast domains. VLANs confine broadcast traffic to the  
originating group, and can eliminate broadcast storms in large networks. This  
provides a more secure and cleaner network environment.  
VLANs can be based on untagged port groups, or traffic can be explicitly tagged to  
identify the VLAN group to which it belongs. Untagged VLANs can be used for small  
networks attached to a single switch. However, tagged VLANs should be used for  
larger networks, and all the VLANs assigned to the inter-switch links.  
R&D  
Tagged Port  
VLAN 1  
Untagged Ports  
VLAN  
aware  
switch  
Tagged  
Ports  
VLAN  
unaware  
Finance  
switch  
Marketing  
R&D  
Testing  
Finance  
VLAN 2  
Testing  
VLAN 1  
VLAN 3  
VLAN 4  
VLAN 2  
VLAN 3  
Figure 2-4 Making VLAN Connections  
Note: When connecting to a switch that does not support IEEE 802.1Q VLAN tags, use  
untagged ports.  
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Network Planning  
2
Application Notes  
1. Full-duplex operation only applies to point-to-point access (such as when a  
switch is attached to a workstation, server or another switch). When the switch  
is connected to a hub, both devices must operate in half-duplex mode.  
2. Avoid using flow control on a port connected to a hub unless it is actually  
required to solve a problem. Otherwise back pressure jamming signals may  
degrade overall performance for the segment attached to the hub.  
3. As a general rule the length of fiber optic cable for a single switched link should  
not exceed:  
• 1000BASE-SX: 550 m (1805 ft) for multimode fiber.  
• 1000BASE-LX: 5 km (3.1 miles) for singlemode fiber.  
• 1000BASE-LH: 70 km (43.5 miles) for singlemode fiber.  
However, power budget constraints must also be considered when calculating  
the maximum cable length for your specific environment.  
4. The maximum number of units that can be stacked together are:  
• 4 MIL-SM4804G units  
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Chapter 3: Installing the Switch  
Selecting a Site  
Switch units can be mounted in a standard 19-inch equipment rack or on a flat  
surface. Be sure to follow the guidelines below when choosing a location.  
•
The site should:  
-
-
be at the center of all the devices you want to link and near a power outlet.  
be able to maintain its temperature within  
0 to 50 °C (32 to 122 °F) for the MIL-SM4804G, and  
its humidity within 5% to 95%, non-condensing  
-
provide adequate space (approximately two inches) on all sides for proper air  
flow  
-
-
be accessible for installing, cabling and maintaining the devices  
allow the status LEDs to be clearly visible  
•
•
Make sure twisted-pair cable is always routed away from power lines, fluorescent  
lighting fixtures and other sources of electrical interference, such as radios and  
transmitters.  
Make sure that the unit is connected to a separate grounded power outlet that  
provides 100 to 240 VAC, 50 to 60 Hz, is within 2 m (6.6 feet) of each device and  
is powered from an independent circuit breaker. As with any equipment, using a  
filter or surge suppressor is recommended.  
Ethernet Cabling  
To ensure proper operation when installing the switch into a network, make sure that  
the current cables are suitable for 10BASE-T, 100BASE-TX or 1000BASE-T  
operation. Check the following criteria against the current installation of your  
network:  
•
Cable type: Unshielded twisted pair (UTP) or shielded twisted pair (STP) cables  
with RJ-45 connectors; Category 3 or better for 10BASE-T, Category 5 or better  
for 100BASE-TX, and Category 5, 5e or 6 for 1000BASE-T.  
•
•
•
Protection from radio frequency interference emissions  
Electrical surge suppression  
Separation of electrical wires (switch related or other) and electromagnetic fields  
from data based network wiring  
•
Safe connections with no damaged cables, connectors or shields  
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Installing the Switch  
3
RJ-45 Connector  
Figure 3-1 RJ-45 Connections  
Equipment Checklist  
After unpacking this switch, check the contents to be sure you have received all the  
components. Then, before beginning the installation, be sure you have all other  
necessary installation equipment.  
Package Contents  
•
•
•
Stackable Fast Ethernet Switch (MIL-SM4804G)  
Four adhesive foot pads  
Bracket Mounting Kit containing two brackets and eight screws for attaching the  
brackets to the switch  
•
•
•
•
•
Power Cord—either US, Continental Europe or UK  
RS-232 console cable  
Stacking cable  
This Installation Guide  
Management Guide  
Optional Rack-Mounting Equipment  
If you plan to rack-mount the switch, be sure to have the following equipment  
available:  
•
•
Four mounting screws for each device you plan to install in a rack—these are not  
included  
A screwdriver (Phillips or flathead, depending on the type of screws used)  
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Mounting  
3
Mounting  
This switch can be mounted in a standard 19-inch equipment rack or on a desktop or  
shelf. Mounting instructions for each type of site follow.  
Rack Mounting  
Before rack mounting the switch, pay particular attention to the following factors:  
•
Temperature: Since the temperature within a rack assembly may be higher than  
the ambient room temperature, check that the rack-environment temperature is  
within the specified operating temperature range. (See page C-1.)  
•
•
Mechanical Loading: Do not place any equipment on top of a rack-mounted unit.  
Circuit Overloading: Be sure that the supply circuit to the rack assembly is not  
overloaded.  
•
Grounding: Rack-mounted equipment should be properly grounded. Particular  
attention should be given to supply connections other than direct connections to  
the mains.  
To rack-mount devices:  
1. Attach the brackets to the device using the screws provided in the Bracket  
Mounting Kit.  
Figure 3-2 Attaching the Brackets  
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Installing the Switch  
3
2. Mount the device in the rack, using four rack-mounting screws (not provided).  
Figure 3-3 Installing the Switch in a Rack  
3. If installing a single switch only, turn to “Connecting to a Power Source” at the  
end of this chapter.  
4. If installing multiple switches, mount them in the rack, one below the other, in  
any order.  
5. If also installing an RPS, mount it in the rack below the other devices.  
Montage (Rack Mounting Instructions - German)  
MIL-SM4804G Switch-Einheiten können an ein standardmäßiges 19-Zoll  
Einrichtungsrack, einen Arbeitstisch oder ein Regal montiert werden. Folgend finden  
Sie die Montageanweisungen für jeden Positionstyp.  
Rack-Montage  
Beachten Sie die folgenden Faktoren, bevor Sie die Rack-Montage beginnen:  
•
Temperatur: Da die Temperatur innerhalb einer Rackeinheit höher als die  
Raumumgebungstemperatur sein kann, stellen Sie bitte sicher, dass die  
Rackumgebungstemperatur innerhalb des angegebenen Betriebstemperaturbereichs  
liegt. (Siehe "Temperatur" auf Seite C-1.)  
•
•
Mechanische Last: Stellen Sie kein Gerät auf eine Rack-Montageeinheit.  
Stromüberlastung: Stellen Sie sicher, dass der Netzkreis der Rackeinheit nicht  
überlastet wird.  
•
Erdung: Die Rack-Montageeinheit muss richtig geerdet werden. Besondere Acht sollten  
Sie bei Verbindungen geben, die nicht direkt zum Netz führen.  
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Mounting  
3
So montieren Sie Geräte an ein Rack:  
1. Befestigen Sie die Metallwinkel mit den im Metallwinkel-Montageset erhältlichen  
Schrauben an dem Gerät.  
2. Befestigen Sie das Gerät mit vier Rackmontageschrauben (nicht beigelegt) an dem  
Rack.  
3. Wenn Sie nur einen Switch installieren, dann springen Sie bitte über zu "Verbinden mit  
einer Stromquelle" auf Seite 3-8 am Ende dieses Kapitels.  
4. Wenn Sie mehrere Switches installieren möchten, dann montieren Sie sie  
untereinander in einer beliebigen Reihenfolge.  
Desktop or Shelf Mounting  
1. Attach the four adhesive feet to the bottom of the first switch.  
Figure 3-4 Attaching the Adhesive Feet  
2. Set the device on a flat surface near an AC power source, making sure there  
are at least two inches of space on all sides for proper air flow.  
3. If installing a single switch only, go to “Connecting to a Power Source” at the  
end of this chapter.  
4. If installing multiple switches, attach four adhesive feet to each one. Place each  
device squarely on top of the one below, in any order.  
5. If also installing an RPS, place it close to the stack.  
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Installing the Switch  
3
Installing an Optional SFP Transceiver  
Figure 3-5 Installing an SFP Transceiver into a slot  
This switch supports 1000BASE-SX, 1000BASE-LX, and 1000BASE-LH SFP  
transceivers. To install an SFP transceiver, do the following:  
1. Consider network and cabling requirements to select an appropriate SFP  
transceiver type.  
2. Insert the transceiver with the optical connector facing outward and the slot  
connector facing down. Note that SFP transceivers are keyed so they can only  
be installed in one orientation.  
3. Slide the SFP transceiver into the slot until it clicks into place.  
Note: SFP transceivers are hot-swappable. The switch does not need to be powered off  
before installing or removing a transceiver. However, always first disconnect the  
network cable before removing a transceiver.  
Note: SFP transceivers are not provided in the switch package.  
Connecting Switches in a Stack  
Figure 3-6 shows how the stack cables are connected between switches in a stack.  
The connection is based on Gigabit Ethernet, using Category 5 or better cables. The  
switch supports a line- and ring-topology stacking configuration, or can be used stand  
alone.  
In line-topology stacking there is a single stack cable connection between each  
switch that carries two-way communications across the stack. In ring-topology  
stacking, an extra cable is connected between the top and bottom switches forming  
a “ring” or “closed-loop.” The closed-loop cable provides a redundant path for the  
stack link, so if one link fails, stack communications can be maintained. Figure 3-6  
illustrates a ring-topology stacking configuration.  
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Connecting Switches in a Stack  
3
You can form a stack containing up to four MIL-SM4804G units. To connect switches  
in a stack, perform the following steps:  
1. Enable the stacking ports on each unit (i.e., the Stack button pushed out)  
Note: Pressing the Stack button during normal operation will cause the system to  
reboot.  
2. Plug one end of a stack cable (ordered separately) into the Down (left) port of  
the top unit.  
3. Plug the other end of the stack cable into the Up (right) port of the next unit.  
4. Repeat steps 1 and 2 for each unit in the stack. Form a simple chain starting at  
the Down port on the top unit and ending at the Up port on the bottom unit  
(stacking up to 4 units).  
5. (Optional) To form a wrap-around topology, plug one end of a stack cable into  
the Down port on the bottom unit and the other end into the Up port on the top  
unit.  
27  
27  
27  
28  
28  
28  
19 20  
21 22  
23 24  
PWR  
Diag  
RPS  
Stack  
Master  
23/24  
25  
25  
25  
26  
26  
26  
19/20  
/22  
19 2
21 2  
23 24  
PWR  
Diag  
RPS  
Stack  
Master  
19/20  
/22  
23/24  
19 2
21 22  
23 24  
PWR  
Diag  
RPS  
Stack  
Master  
19/20  
21/22  
23/24  
Figure 3-6 Connecting Switches in a Ring-topology Stack  
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Installing the Switch  
3
6. Select the Master unit in the stack by pressing in the Master button on only one  
of the switches. Only one switch in the stack can operate as the Master, all  
other units operate in slave mode. If more than one switch in the stack is  
selected as Master, or if no switches are selected, the stack will not function.  
Connecting to a Power Source  
To connect a switch to a power source:  
1. Insert the power cable plug directly into the AC receptacle located at the back  
of the switch.  
MIL-SM4804G  
RPS  
DC  
12V 4.5A  
100-240V~ 50-60Hz 2A  
Figure 3-7 Power Receptacles  
2. Plug the other end of the cable into a grounded, 3-pin, AC power source.  
Note: For International use, you may need to change the AC line cord. You must  
use a line cord set that has been approved for the receptacle type in your  
country.  
3. Check the front-panel LEDs as the device is powered on to be sure the PWR  
LED is lit. If not, check that the power cable is correctly plugged in.  
4. If you have purchased a Redundant Power Unit, connect it to the switch and to  
an AC power source now, following the instructions included with the package.  
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Connecting to the Console Port  
3
Connecting to the Console Port  
The DB-9 serial port on the switch’s back panel is used to connect to the switch for  
out-of-band console configuration. The command-line-driven configuration program  
can be accessed from a terminal or a PC running a terminal emulation program. The  
pin assignments used to connect to the serial port are provided in the following table.  
1
5
6
9
Figure 3-8 Serial Port (DB-9 DTE) Pin-Out  
Wiring Map for Serial Cable  
Table 3-1 Serial Cable Wiring  
Null Modem  
Switch’s 9-Pin  
Serial Port  
PC’s 9-Pin  
DTE Port  
2 RXD (receive data)  
3 TXD (transmit data)  
<---------------------------- 3 TXD (transmit data)  
-----------------------------> 2 RXD (receive data)  
5 SGND (signal ground) ------------------------------ 5 SGND (signal ground)  
No other pins are used.  
The serial port’s configuration requirements are as follows:  
•
•
•
•
•
Default Baud rate—9,600 bps  
Character Size—8 Characters  
Parity—None  
Stop bit—One  
Data bits—8  
3-9  
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Installing the Switch  
3
3-10  
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Chapter 4: Making Network Connections  
Connecting Network Devices  
These switches are designed to be connected to 10, 100 or 1000 Mbps network  
cards in PCs and servers, as well as to other switches and hubs. They may also be  
connected to remote devices using optional 1000BASE-SX, 1000BASE-LX, or  
1000BASE-LH SFP transceivers.  
Twisted-Pair Devices  
Each device requires an unshielded twisted-pair (UTP) cable with RJ-45 connectors  
at both ends. Use Category 5, 5e or 6 cable for 1000BASE-T connections, Category  
5 or better for 100BASE-TX connections, and Category 3 or better for 10BASE-T  
connections.  
Cabling Guidelines  
The RJ-45 ports on these switches support automatic MDI/MDI-X pinout  
configuration, so you can use standard straight-through twisted-pair cables to  
connect to any other network device (PCs, servers, switches, routers, or hubs).  
See Appendix B for further information on cabling.  
Caution: Do not plug a phone jack connector into an RJ-45 port. This will damage the  
switch. Use only twisted-pair cables with RJ-45 connectors that conform to  
FCC standards.  
4-1  
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Making Network Connections  
4
Connecting to PCs, Servers, Hubs and Switches  
1. Attach one end of a twisted-pair cable segment to the device’s RJ-45  
connector.  
Figure 4-1 Making Twisted-Pair Connections  
2. If the device is a network card and the switch is in the wiring closet, attach the  
other end of the cable segment to a modular wall outlet that is connected to the  
wiring closet. (See the section “Network Wiring Connections.”) Otherwise,  
attach the other end to an available port on the switch.  
Make sure each twisted pair cable does not exceed 100 meters (328 ft) in  
length.  
Note: Avoid using flow control on a port connected to a hub unless it is actually required  
to solve a problem. Otherwise back pressure jamming signals may degrade  
overall performance for the segment attached to the hub.  
3. As each connection is made, the Link LED (on the switch) corresponding to  
each port will light to indicate that the connection is valid.  
Network Wiring Connections  
Today, the punch-down block is an integral part of many of the newer equipment  
racks. It is actually part of the patch panel. Instructions for making connections in the  
wiring closet with this type of equipment follows.  
1. Attach one end of a patch cable to an available port on the switch, and the other  
end to the patch panel.  
2. If not already in place, attach one end of a cable segment to the back of the  
patch panel where the punch-down block is located, and the other end to a  
modular wall outlet.  
4-2  
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Twisted-Pair Devices  
4
3. Label the cables to simplify future troubleshooting. See “Cable Labeling and  
Connection Records” on page 4-7.  
Equipment Rack  
Switch  
(side view)  
Punch-Down Block  
Patch Panel  
Wall  
Figure 4-2 Network Wiring Connections  
4-3  
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Making Network Connections  
4
Fiber Optic SFP Devices  
An optional Gigabit SFP transceiver (1000BASE-SX, 1000BASE-LX, or  
1000BASE-LH) can be used for a backbone connection between switches, or for  
connecting to a high-speed server.  
Each single-mode fiber port requires 9/125 micron single-mode fiber optic cable with  
an LC connector at both ends. Each multimode fiber optic port requires 50/125 or  
62.5/125 micron multimode fiber optic cabling with an LC connector at both ends.  
Warning: This switch uses lasers to transmit signals over fiber optic cable. The lasers are  
compliant with the requirements of a Class 1 Laser Product and are inherently  
eye safe in normal operation. However, you should never look directly at a  
transmit port when it is powered on.  
Note: When selecting a fiber SFP device, considering safety, please make sure that it  
can function at a temperature that is not less than the recommended maximum  
operational temperature of the product. You must also use an approved Laser  
Class 1 SFP transceiver.  
Hinweis: Bei der Wahl eines Glasfasertransceivers muß für die Beurteilung der  
Gesamtsicherheit beachtet werden, das die maximale Umgebungstemperatur  
des Transceivers für den Betrieb nicht niedriger ist als die für dieses Produkts.  
Der Glasfasertransceiver muß auch ein überprüftes Gerät der Laser Klasse 1  
sein.  
1. Remove and keep the LC port’s rubber plug. When not connected to a fiber  
cable, the rubber plug should be replaced to protect the optics.  
2. Check that the fiber terminators are clean. You can clean the cable plugs by  
wiping them gently with a clean tissue or cotton ball moistened with a little  
ethanol. Dirty fiber terminators on fiber optic cables will impair the quality of the  
light transmitted through the cable and lead to degraded performance on the  
port.  
4-4  
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Connectivity Rules  
4
3. Connect one end of the cable to the LC port on the switch and the other end to  
the LC port on the other device. Since LC connectors are keyed, the cable can  
be attached in only one orientation.  
Figure 4-3 Making Fiber Port Connections  
4. As a connection is made, check the Link LED on the switch corresponding to  
the port to be sure that the connection is valid.  
The 1000BASE-SX, 1000BASE-LX, 1000BASE-LH fiber optic ports operate at  
1 Gbps, full duplex, with auto-negotiation of flow control. The maximum length for  
fiber optic cable operating at Gigabit speed will depend on the fiber type as listed  
under “1000 Mbps Gigabit Ethernet Collision Domain” on page 4-6.  
Connectivity Rules  
When adding hubs (repeaters) to your network, please follow the connectivity rules  
listed in the manuals for these products. However, note that because switches break  
up the path for connected devices into separate collision domains, you should not  
include the switch or connected cabling in your calculations for cascade length  
involving other devices.  
1000BASE-T Cable Requirements  
All Category 5 UTP cables that are used for 100BASE-TX connections should also  
work for 1000BASE-T, providing that all four wire pairs are connected. However, it is  
recommended that for all critical connections, or any new cable installations,  
Category 5e (enhanced Category 5) or Category 6 cable should be used. The  
Category 5e and 6 specifications include test parameters that are only  
recommendations for Category 5. Therefore, the first step in preparing existing  
4-5  
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Making Network Connections  
4
Category 5 cabling for running 1000BASE-T is a simple test of the cable installation  
to be sure that it complies with the IEEE 802.3-2002 standards.  
1000 Mbps Gigabit Ethernet Collision Domain  
Table 4-1 Maximum 1000BASE-T Gigabit Ethernet Cable Length  
Cable Type  
Maximum Cable Length Connector  
RJ-45  
Category 5, 5e, or 6 100-ohm UTP or STP 100 m (328 ft)  
Table 4-2 Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths  
Fiber Size  
Fiber Bandwidth  
160 MHz/km  
Maximum Cable Length Connector  
62.5/125 micron  
multimode fiber  
2-220 m (7-722 ft)  
2-275 m (7-902 ft)  
2-500 m (7-1641 ft)  
2-550 m (7-1805 ft)  
LC  
LC  
LC  
LC  
200 MHz/km  
50/125 micron multimode 400 MHz/km  
fiber  
500 MHz/km  
Table 4-3 Maximum 1000BASE-LX Gigabit Ethernet Cable Length  
Fiber Size  
Fiber Bandwidth  
Maximum Cable Length  
Connector  
9/125 micron  
single-mode fiber  
N/A  
2 m - 5 km (7 ft - 3.2 miles) LC  
Table 4-4 Maximum 1000BASE-LH Gigabit Ethernet Cable Length  
Fiber Size  
Fiber Bandwidth  
Maximum Cable Length  
Connector  
9/125 micron  
single-mode fiber  
N/A  
2 m - 70 km (7 ft - 43.5 miles) LC  
100 Mbps Fast Ethernet Collision Domain  
Table 4-5 Maximum Fast Ethernet Cable Length  
Type  
Cable Type  
Max. Cable Length Connector  
100BASE-TX Category 5 or better 100-ohm UTP or STP 100 m (328 ft)  
RJ-45  
10 Mbps Ethernet Collision Domain  
Table 4-6 Maximum Ethernet Cable Length  
Type  
Cable Type  
Max. Cable Length Connector  
100 m (328 ft) RJ-45  
10BASE-T  
Category 3 or better 100-ohm UTP  
4-6  
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Cable Labeling and Connection Records  
4
Cable Labeling and Connection Records  
When planning a network installation, it is essential to label the opposing ends of  
cables and to record where each cable is connected. Doing so will enable you to  
easily locate inter-connected devices, isolate faults and change your topology  
without need for unnecessary time consumption.  
To best manage the physical implementations of your network, follow these  
guidelines:  
•
•
Clearly label the opposing ends of each cable.  
Using your building’s floor plans, draw a map of the location of all  
network-connected equipment. For each piece of equipment, identify the devices  
to which it is connected.  
•
•
Note the length of each cable and the maximum cable length supported by the  
switch ports.  
For ease of understanding, use a location-based key when assigning prefixes to  
your cable labeling.  
•
•
•
•
Use sequential numbers for cables that originate from the same equipment.  
Differentiate between racks by naming accordingly.  
Label each separate piece of equipment.  
Display a copy of your equipment map, including keys to all abbreviations at each  
equipment rack.  
4-7  
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Making Network Connections  
4
4-8  
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Appendix A: Troubleshooting  
Diagnosing Switch Indicators  
Table A-1 Troubleshooting Chart  
Symptom  
Action  
PWR LED is Off  
•
Check connections between the switch, the power cord and the wall  
outlet.  
•
•
Contact your dealer for assistance  
PWR LED is Amber  
Diag LED is Amber  
Internal power supply has failed. Contact your local dealer for  
assistance.  
•
•
Power cycle the switch to try and clear the condition  
If the condition does not clear, contact your dealer for assistance  
Stack Master LED is Flashing  
Amber  
•
•
•
The stack has not completed its initial configuration. Wait a few  
minutes for the process to complete.  
If flashing continues, check that the Master Select button is pressed in  
on only one switch.  
Check that all stacking cables are properly connected.  
Link LED is Off  
•
•
Verify that the switch and attached device are powered on.  
Be sure the cable is plugged into both the switch and corresponding  
device.  
•
•
•
If the switch is installed in a rack, check the connections to the  
punch-down block and patch panel.  
Verify that the proper cable type is used and its length does not exceed  
specified limits.  
Check the adapter on the attached device and cable connections for  
possible defects. Replace the defective adapter or cable if necessary.  
Diagnosing Power Problems with the LEDs  
The Power and RPS LEDs work in combination to indicate power status as follows.  
Table A-2 Power/RPS LEDs  
Power LED  
Green  
Green  
Amber  
Off  
RPS LED  
Amber  
Off  
Status  
Internal power functioning normally; RPS plugged in.  
Internal power functioning normally; RPS not plugged in.  
Internal power faulty; RPS delivering power.  
Both internal power and RPS unplugged or not functioning.  
Green  
Off  
A-1  
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Troubleshooting  
A
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.  
However, if the unit powers off after running for a while, check for loose power  
connections, power losses or surges at the power outlet. If you still cannot isolate  
the problem, the internal power supply may be defective.  
Installation  
Verify that all system components have been properly installed. If one or more  
components appear to be malfunctioning (such as the power cord or network  
cabling), test them in an alternate environment where you are sure that all the other  
components are functioning properly.  
In-Band Access  
You can access the management agent in the switch from anywhere within the  
attached network using Telnet, a web browser, or other network management  
software tools. However, you must first configure the switch with a valid IP address,  
subnet mask, and default gateway. If you have trouble establishing a link to the  
management agent, check to see if you have a valid network connection. Then  
verify that you entered the correct IP address. Also, be sure the port through which  
you are connecting to the switch has not been disabled. If it has not been disabled,  
then check the network cabling that runs between your remote location and the  
switch.  
Note:  
The management agent accepts up to four simultaneous Telnet sessions. If the  
maximum number of sessions already exists, an additional Telnet connection  
will not be able to log into the system.  
Stack Troubleshooting  
If a stack fails to initialize or function, first check the following items:  
• Check that all stacking cables are properly connected.  
• Check if any stacking cables appear damaged.  
• Check that the Master select button is pressed in on only one unit in the stack.  
• Check that each unit has the stacking ports enabled (the Stack button pushed out).  
• Check that all switches in the stack are powered on.  
After checking all items, reboot all the switches in the stack.  
A-2  
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Appendix B: Cables  
Twisted-Pair Cable and Pin Assignments  
For 10/100BASE-TX connections, the twisted-pair cable must have two pairs of  
wires. For 1000BASE-T connections the twisted-pair cable must have four pairs of  
wires. Each wire pair is identified by two different colors. For example, one wire  
might be green and the other, green with white stripes. Also, an RJ-45 connector  
must be attached to both ends of the cable.  
Caution:  
DO NOT plug a phone jack connector into any RJ-45 port. Use only  
twisted-pair cables with RJ-45 connectors that conform with FCC standards.  
Caution:  
Each wire pair must be attached to the RJ-45 connectors in a specific  
orientation. (See “Straight-Through Wiring” and “Crossover Wiring” on the  
next page for an explanation.)  
The figure below illustrates how the pins on the RJ-45 connector are numbered. Be  
sure to hold the connectors in the same orientation when attaching the wires to the  
pins.  
8
8
1
1
Figure B-1 RJ-45 Connector Pin Numbers  
10BASE-T/100BASE-TX Pin Assignments  
Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45  
connections: 100-ohm Category 3 or better cable for 10 Mbps connections, or  
100-ohm Category 5 or better cable for 100 Mbps connections. Also be sure that the  
length of any twisted-pair connection does not exceed 100 meters (328 feet).  
The RJ-45 ports on the switch base unit support automatic MDI/MDI-X operation, so  
you can use straight-through cables for all network connections to PCs or servers, or  
to other switches or hubs. In straight-through cable, pins 1, 2, 3, and 6, at one end of  
the cable, are connected straight through to pins 1, 2, 3, and 6 at the other end of  
the cable. When using any RJ-45 port on this switch, you can use either  
straight-through or crossover cable.  
B-1  
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Cables  
B
Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts  
Pin  
MDI Signal Name  
Transmit Data plus (TD+)  
Transmit Data minus (TD-)  
Receive Data plus (RD+)  
Receive Data minus (RD-)  
Not used  
MDI-X Signal Name  
Receive Data plus (RD+)  
Receive Data minus (RD-)  
Transmit Data plus (TD+)  
Transmit Data minus (TD-)  
Not used  
1
2
3
6
4,5,7,8  
Note: The “+” and “-” signs represent the polarity of the wires that make  
up each wire pair.  
Straight-Through Wiring  
If the twisted-pair cable is to join two ports and only one of the ports has an internal  
crossover (MDI-X), the two pairs of wires must be straight-through. (When  
auto-negotiation is enabled for any RJ-45 port on this switch, you can use either  
straight-through or crossover cable to connect to any device type.)  
You must connect all four wire pairs as shown in the following diagram to support  
Gigabit Ethernet.  
EIA/TIA 568B RJ-45 Wiring Standard  
10/100BASE-TX Straight-through Cable  
White/Orange Stripe  
Orange  
White/Green Stripe  
Blue  
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
End A  
End B  
White/Blue Stripe  
Green  
White/Brown Stripe  
Brown  
Figure B-2 Straight-through Wiring  
Crossover Wiring  
If the twisted-pair cable is to join two ports and either both ports are labeled with an  
“X” (MDI-X) or neither port is labeled with an “X” (MDI), a crossover must be  
implemented in the wiring. (When auto-negotiation is enabled for any RJ-45 port on  
this switch, you can use either straight-through or crossover cable to connect to any  
device type.)  
B-2  
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Twisted-Pair Cable and Pin Assignments  
B
You must connect all four wire pairs as shown in the following diagram to support  
Gigabit Ethernet.  
EIA/TIA 568B RJ-45 Wiring Standard  
10/100BASE-TX Crossover Cable  
White/Orange Stripe  
Orange  
White/Green Stripe  
Blue  
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
End A  
End B  
White/Blue Stripe  
Green  
White/Brown Stripe  
Brown  
Figure B-3 Crossover Wiring  
1000BASE-T Pin Assignments  
All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use  
straight-through cables for all network connections to PCs or servers, or to other  
switches or hubs.  
The table below shows the 1000BASE-T MDI and MDI-X port pinouts. These ports  
require that all four pairs of wires be connected. Note that for 1000BASE-T  
operation, all four pairs of wires are used for both transmit and receive.  
Use 100-ohm Category 5, 5e or 6 unshielded twisted-pair (UTP) or shielded  
twisted-pair (STP) cable for 1000BASE-T connections. Also be sure that the length  
of any twisted-pair connection does not exceed 100 meters (328 feet)  
.
Table B-2 1000BASE-T MDI and MDI-X Port Pinouts  
Pin  
1
MDI Signal Name  
MDI-X Signal Name  
Bi-directional Data One Plus (BI_D1+)  
Bi-directional Data One Minus (BI_D1-)  
Bi-directional Data Two Plus (BI_D2+)  
Bi-directional Data Three Plus (BI_D3+)  
Bi-directional Data Three Minus (BI_D3-)  
Bi-directional Data Two Minus (BI_D2-)  
Bi-directional Data Four Plus (BI_D4+)  
Bi-directional Data Four Minus (BI_D4-)  
Bi-directional Data Two Plus (BI_D2+)  
Bi-directional Data Two Minus (BI_D2-)  
Bi-directional Data One Plus (BI_D1+)  
Bi-directional Data Four Plus (BI_D4+)  
Bi-directional Data Four Minus (BI_D4-)  
Bi-directional Data One Minus (BI_D1-)  
Bi-directional Data Three Plus (BI_D3+)  
Bi-directional Data Three Minus (BI_D3-)  
2
3
4
5
6
7
8
B-3  
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Cables  
B
Cable Testing for Existing Category 5 Cable  
Installed Category 5 cabling must pass tests for Attenuation, Near-End Crosstalk  
(NEXT), and Far-End Crosstalk (FEXT). This cable testing information is specified in  
the ANSI/TIA/EIA-TSB-67 standard. Additionally, cables must also pass test  
parameters for Return Loss and Equal-Level Far-End Crosstalk (ELFEXT). These  
tests are specified in the ANSI/TIA/EIA-TSB-95 Bulletin, “The Additional  
Transmission Performance Guidelines for 100 Ohm 4-Pair Category 5 Cabling.”  
Note that when testing your cable installation, be sure to include all patch cables  
between switches and end devices.  
Adjusting Existing Category 5 Cabling to Run 1000BASE-T  
If your existing Category 5 installation does not meet one of the test parameters for  
1000BASE-T, there are basically three measures that can be applied to try and  
correct the problem:  
1. Replace any Category 5 patch cables with high-performance Category 5e or  
Category 6 cables.  
2. Reduce the number of connectors used in the link.  
3. Reconnect some of the connectors in the link.  
Fiber Standards  
The current TIA (Telecommunications Industry Association) 568-A specification on  
optical fiber cabling consists of one recognized cable type for horizontal subsystems  
and two cable types for backbone subsystems.  
Horizontal 62.5/125 micron multimode (two fibers per outlet).  
Backbone 62.5/125 micron multimode or single-mode.  
TIA 568-B will allow the use of 50/125 micron multimode optical fiber in both the  
horizontal and backbone in addition to the types listed above. All optical fiber  
components and installation practices must meet applicable building and safety  
codes.  
B-4  
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Appendix C: Specifications  
Physical Characteristics  
Ports  
48 10/100BASE-TX, with auto-negotiation  
Two 10/100/1000BASE-T shared with two SFP transceiver slots  
Two 10/100/1000BASE-T or Stacking Ports (button selection)  
Network Interface  
Ports 1-48: RJ-45 connector, auto MDI/X  
10BASE-T: RJ-45 (100-ohm, UTP cable; Category 3 or better)  
100BASE-TX: RJ-45 (100-ohm, UTP cable; Category 5 or better)  
Ports 49-52: RJ-45 connector, auto MDI/X  
10BASE-T: RJ-45 (100-ohm, UTP cable; Category 3 or better)  
100BASE-TX: RJ-45 (100-ohm, UTP cable; Category 5 or better)  
1000BASE-T: RJ-45 (100-ohm, UTP or STP cable; Category 5, 5e or 6)  
Buffer Architecture  
4 Mbits  
Aggregate Bandwidth  
17.6 Gbps  
Switching Database  
8K MAC address entries  
LEDs  
System: PWR (Power Supply), Diag (Diagnostic),  
RPS (Redundant Power Supply), Stack Master  
Port: status (link, speed, and activity)  
Weight  
3.09 kg (6.81 lbs)  
Size  
44.0 x 23 x 4.4 cm (17.32 x 9.06 x 1.73 in.)  
Temperature  
Operating: 0°C to 50°C (32°F to 122°F)  
Storage: -40°C to 70°C (-40°F to 158°F)  
C-1  
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Specifications  
C
Humidity  
Operating: 5% to 95% (non-condensing)  
Power Supply  
Internal, auto-ranging transformer: 100 to 240 VAC, 50 to 60 Hz, 2A  
External, supports a 14-pin connection for a redundant power supply  
Power Consumption  
54 Watts maximum  
Maximum Current  
2.0 A @ 100 VAC  
1.0 A @ 240 VAC  
Switch Features  
Forwarding Mode  
Store-and-forward  
Throughput  
Wire speed  
Flow Control  
Full Duplex: IEEE 802.3x  
Half Duplex: Back pressure  
Management Features  
In-Band Management  
SSH, Telnet, SNMP, RMON (4-group), or HTTP  
Out-of-Band Management  
RS-232 DB-9 console port  
Software Loading  
TFTP in-band, or XModem out-of-band  
C-2  
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Standards  
C
Standards  
IEEE 802.3-2002  
Ethernet, Fast Ethernet, Gigabit Ethernet  
Full-duplex flow control  
Link Aggregation Control Protocol  
IEEE 802.1D Spanning Tree Protocol  
IEEE 802.1w Rapid Spanning Tree Protocol  
IEEE 802.1X Port Access Authentication  
IEEE 802.1Q VLANs  
ISO/IEC 8802-3  
Compliances  
Emissions  
Industry Canada Class A  
EN55022 (CISPR 22) Class A  
EN 61000-3-2/3  
FCC Class A  
VCCI Class A  
C-Tick - AS/NZS 3548 (1995) Class A  
Immunity  
EN 61000-4-2/3/4/5/6/8/11  
Safety  
CSA/CUS (CSA60950 & UL60950)  
TÜV/GS (EN60950-1)  
CB (IEC60950)  
C-3  
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Specifications  
C
C-4  
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Glossary  
10BASE-T  
IEEE 802.3 specification for 10 Mbps Ethernet over two pairs of Category 3, 4, or 5  
UTP cable.  
100BASE-FX  
IEEE 802.3 specification for 100 Mbps Ethernet over two strands of 50/125, 62.5/  
125 micron, or 9/125 micron core fiber cable.  
100BASE-TX  
IEEE 802.3u specification for 100 Mbps Ethernet over two pairs of Category 5 UTP  
cable.  
1000BASE-LH  
Specification for long-haul Gigabit Ethernet over two strands of 9/125 micron core  
fiber cable.  
1000BASE-LX  
IEEE 802.3z specification for Gigabit Ethernet over two strands of 50/125, 62.5/125  
or 9/125 micron core fiber cable.  
1000BASE-SX  
IEEE 802.3z specification for Gigabit Ethernet over two strands of 50/125 or  
62.5/125 micron core fiber cable.  
1000BASE-T  
IEEE 802.3ab specification for Gigabit Ethernet over 100-ohm Category 5, 5e or 6  
twisted-pair cable (using all four wire pairs).  
Auto-Negotiation  
Signalling method allowing each node to select its optimum operational mode (e.g.,  
speed and duplex mode) based on the capabilities of the node to which it is  
connected.  
Bandwidth  
The difference between the highest and lowest frequencies available for network  
signals. Also synonymous with wire speed, the actual speed of the data  
transmission along the cable.  
Glossary-1  
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Glossary  
Collision  
A condition in which packets transmitted over the cable interfere with each other.  
Their interference makes both signals unintelligible.  
Collision Domain  
Single CSMA/CD LAN segment.  
CSMA/CD  
CSMA/CD (Carrier Sense Multiple Access/Collision Detect) is the communication  
method employed by Ethernet, Fast Ethernet, and Gigabit Ethernet.  
End Station  
A workstation, server, or other device that does not forward traffic.  
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, thin coax and twisted-pair cable.  
Fast Ethernet  
A 100 Mbps network communication system based on Ethernet and the CSMA/CD  
access method.  
Full Duplex  
Transmission method that allows two network devices to transmit and receive  
concurrently, effectively doubling the bandwidth of that link.  
Gigabit Ethernet  
A 1000 Mbps network communication system based on Ethernet and the CSMA/CD  
access method.  
IEEE  
Institute of Electrical and Electronic Engineers.  
IEEE 802.3  
Defines carrier sense multiple access with collision detection (CSMA/CD) access  
method and physical layer specifications.  
IEEE 802.3ab  
Defines CSMA/CD access method and physical layer specifications for  
1000BASE-T Gigabit Ethernet. (Now incorporated in IEEE 802.3-2002.)  
Glossary-2  
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Glossary  
IEEE 802.3u  
Defines CSMA/CD access method and physical layer specifications for  
100BASE-TX Fast Ethernet. (Now incorporated in IEEE 802.3-2002.)  
IEEE 802.3x  
Defines Ethernet frame start/stop requests and timers used for flow control on  
full-duplex links. (Now incorporated in IEEE 802.3-2002.)  
IEEE 802.3z  
Defines CSMA/CD access method and physical layer specifications for 1000BASE  
Gigabit Ethernet. (Now incorporated in IEEE 802.3-2002.)  
LAN Segment  
Separate LAN or collision domain.  
LED  
Light emitting diode used for monitoring a device or network condition.  
Local Area Network (LAN)  
A group of interconnected computer and support devices.  
Media Access Control (MAC)  
A portion of the networking protocol that governs access to the transmission  
medium, facilitating the exchange of data between network nodes.  
MIB  
An acronym for Management Information Base. It is a set of database objects that  
contains information about the device.  
Modal Bandwidth  
Bandwidth for multimode fiber is referred to as modal bandwidth because it varies  
with the modal field (or core diameter) of the fiber. Modal bandwidth is specified in  
units of MHz per km, which indicates the amount of bandwidth supported by the fiber  
for a one km distance.  
Network Diameter  
Wire distance between two end stations in the same collision domain.  
Redundant Power Supply (RPS)  
A backup power supply that automatically takes over in case the primary power  
supply should fail.  
Glossary-3  
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Glossary  
RJ-45 Connector  
A connector for twisted-pair wiring.  
Switched Ports  
Ports that are on separate collision domains or LAN segments.  
TIA  
Telecommunications Industry Association  
Transmission Control Protocol/Internet Protocol (TCP/IP)  
Protocol suite that includes TCP as the primary transport protocol, and IP as the  
network layer protocol.  
UTP  
Unshielded twisted-pair cable.  
Virtual LAN (VLAN)  
A Virtual LAN is a collection of network nodes that share the same collision domain  
regardless of their physical location or connection point in the network. A VLAN  
serves as a logical workgroup with no physical barriers, allowing users to share  
information and resources as though located on the same LAN.  
Glossary-4  
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Index  
connectivity rules  
10 Mbps 4-6  
Numerics  
10 Mbps connectivity rules 4-6  
100 Mbps connectivity rules 4-6  
1000 Mbps connectivity rules 4-6  
1000BASE-LH fiber cable length 4-6  
1000BASE-LX fiber cable length 4-6  
1000BASE-SX fiber cable length 4-6  
1000BASE-T  
100 Mbps 4-6  
1000 Mbps 4-6  
console port, pin assignments 3-9  
contents of package 3-2  
cooling problems A-2  
cord sets, international 3-8  
pin assignments B-3  
ports 1-3  
100BASE-TX  
D
desktop mounting 3-5  
device connections 4-1  
cable length 4-6  
ports 1-2  
10BASE-T  
E
electrical interference, avoiding 3-1  
equipment checklist 3-2  
Ethernet connectivity rules 4-6  
cable length 4-6  
ports 1-2  
A
F
adhesive feet, attaching 3-5  
air flow requirements 3-1  
applications  
Fast Ethernet connectivity rules 4-6  
features C-2  
management 1-8  
switch 1-7  
central wiring closet 2-3  
collapsed backbone 2-2  
remote connections with fiber 2-4  
VLAN connections 2-5  
fiber cables 4-4  
flow control, IEEE 802.3x 1-3  
front panel of switch 1-1  
full duplex connectivity 2-1  
B
brackets, attaching 3-3  
buffer size C-1  
buffers, saturation of 1-3  
G
Gigabit Ethernet cable lengths 4-6  
grounding for racks 3-3  
C
cable  
I
IEEE 802.3x flow control 1-3  
indicators, LED 1-5  
installation  
connecting devices to the switch 4-2  
desktop or shelf mounting 3-5  
network wiring connections 4-2  
port connections 4-1, 4-4  
power requirements 3-1  
problems A-2  
Ethernet cable compatibility 3-1  
fiber standards B-4  
labeling and connection records 4-7  
lengths 4-6  
cleaning fiber terminators 4-4  
compliances  
EMC C-3  
safety C-3  
Index-1  
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Index  
rack mounting 3-3  
site requirements 3-1  
problems, troubleshooting A-1  
R
L
rack mounting 3-3  
rear panel of switch 1-1  
rear panel receptacles 1-7  
RJ-45 port  
connections 4-1  
pinouts B-3  
laser safety 4-4  
LC port connections 4-4  
LED indicators  
Diag 1-6  
Power 1-6  
problems A-1  
RMON 1-2  
Stack 1-6  
location requirements 3-1  
RS-232 port 1-2  
rubber foot pads, attaching 3-5  
M
S
management  
screws for rack mounting 3-2  
agent 1-2  
serial  
features 1-8, C-2  
out-of-band 1-2  
SNMP 1-2  
web-based 1-2  
Maximum Fast Ethernet Cable  
Distance 4-6  
cable 1-2  
port 1-2  
single-mode fiber optic cables 4-4  
site selelction 3-1  
SNMP agent 1-2  
specifications  
mounting the switch  
in a rack 3-3  
on a desktop or shelf 3-5  
multimode fiber optic cables 4-4  
compliances C-2  
environmental C-1  
physical C-1  
power C-2  
standards  
compliance C-2  
IEEE C-3  
N
network  
status LEDs 1-5  
surge suppressor, using 3-1  
switch architecture 1-2  
switching  
introduction to 2-1  
method 1-2  
connections 4-1, 4-4  
examples 2-2  
O
out-of-band management 1-2  
P
T
package contents 3-2  
pin assignments B-1  
1000BASE-T B-3  
10BASE-T/100BASE-TX B-1  
console port 3-9  
Telnet A-2  
temperature within a rack 3-3  
troubleshooting  
in-band access A-2  
power and cooling problems A-2  
switch indicators A-1  
twisted-pair connections 4-1  
DB-9 3-9  
port saturation 1-3  
ports, connecting to 4-1, 4-4  
power, connecting to 3-8  
Index-2  
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Index  
V
VLANs  
tagging 2-5  
W
web-based management 1-2  
Index-3  
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Index  
Index-4  
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MIL-SM4804G  
90000444 REV A  
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