Fanless Gigabit
Ethernet Switches
AT-GS900/16
AT-GS900/24
Installation Guide
613-000891 Rev. A
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Electrical Safety and Emissions Standards
This product meets the following standards.
U.S. Federal Communications Commission
Radiated Energy
Note: This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15
of FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with this instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.
Note: Modifications or changes not expressly approved of by the manufacturer or the FCC, can void your right to operate
this equipment.
Industry Canada
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
European Union Restriction of the Use of Certain Hazardous Substances
(RoHS) in Electrical and Electronic Equipment
This Allied Telesis RoHS-compliant product conforms to the European Union Restriction of the Use of Certain Hazardous
Substances (RoHS) in Electrical and Electronic Equipment. Allied Telesis ensures RoHS conformance by requiring
supplier Declarations of Conformity, monitoring incoming materials, and maintaining manufacturing process controls.
RFI Emissions
FCC Class A, CISPR 22 Class A, EN55022 Class A, C-TICK
Warning: In a domestic environment this product may cause radio interference in
which case the user may be required to take adequate measures.
Immunity
EN55024
Electrical Safety
EN60950-1 (TUV), UL 60950 (CULUS)
3
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Translated Safety Statements
Important: The ꢀ indicates that a translation of the safety statements is available in a PDF
document titled “Translated Safety Statements” (613-000405) which is posted on the Allied Telesis
shipped with the product.
4
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Preface ..................................................................................................................................................................................7
Safety Symbols Used in this Document..................................................................................................................................8
Where to Find Web-based Guides .........................................................................................................................................9
Contacting Allied Telesis ......................................................................................................................................................10
Online Support ..............................................................................................................................................................10
Email and Telephone Support.......................................................................................................................................10
Returning Products........................................................................................................................................................10
For Sales or Corporate Information...............................................................................................................................10
Warranty........................................................................................................................................................................10
Management Software Updates ...........................................................................................................................................11
Chapter 1: Product Description ........................................................................................................................................12
Features ...............................................................................................................................................................................13
Standards .............................................................................................................................................................................13
Components .........................................................................................................................................................................14
Hardware Feature Description..............................................................................................................................................15
Twisted Pair Ports .........................................................................................................................................................15
LEDs..............................................................................................................................................................................16
AC Power Connector.....................................................................................................................................................17
Ethernet Switching Basics....................................................................................................................................................18
MAC Address Table ......................................................................................................................................................18
Duplex Mode .................................................................................................................................................................19
Store and Forward.........................................................................................................................................................19
Backpressure and Flow Control ....................................................................................................................................19
Network Topologies..............................................................................................................................................................20
Power Workgroup Topology..........................................................................................................................................20
Collapsed Backbone .....................................................................................................................................................21
Chapter 2: Installation .......................................................................................................................................................22
Reviewing Safety Precautions..............................................................................................................................................23
Selecting a Site for the Switch..............................................................................................................................................24
Planning the Installation .......................................................................................................................................................25
Unpacking the Switch...........................................................................................................................................................26
Installing the Switch on a Table or Desktop..........................................................................................................................27
Installing the Switch on a Wall..............................................................................................................................................29
Installing the Switch in a Rack..............................................................................................................................................32
Cabling the Switch................................................................................................................................................................35
Powering On the Switch .......................................................................................................................................................36
Chapter 3: Troubleshooting ..............................................................................................................................................37
Appendix A: Technical Specifications .............................................................................................................................38
Physical Specifications.........................................................................................................................................................38
Environmental Specifications................................................................................................................................................38
Power Specifications ............................................................................................................................................................38
Safety and Electromagnetic Emissions Certifications...........................................................................................................39
Compliance Standards .........................................................................................................................................................39
RJ-45 Twisted Pair Port Connectors ....................................................................................................................................39
5
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Contents
6
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Preface
Safety Symbols Used in this Document
This document uses the safety symbols defined in Table 1.
Table 1. Safety Symbols
Symbol Meaning
Description
Caution
Performing or omitting a specific action may
result in equipment damage or loss of data.
Warning
Performing or omitting a specific action may
result in electrical shock.
8
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Where to Find Web-based Guides
The installation and user guides for all Allied Telesis products are available
in portable document format (PDF) on our web site at
www.alliedtelesis.com. You can view the documents online or download
them onto a local workstation or server.
9
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Preface
Contacting Allied Telesis
This section provides Allied Telesis contact information for technical
support as well as sales or corporate information.
Online Support You can request technical support online by accessing the Allied Telesis
Knowledge Base from the following web site:
www.alliedtelesis.com/support. You can use the Knowledge Base to
submit questions to our technical support staff and review answers to
previously asked questions.
Email and For Technical Support via email or telephone, refer to the Allied Telesis
displayed on the website. Then select the appropriate menu tab.
Telephone
Support
Returning Products for return or repair must first be assigned a Return Materials
Authorization (RMA) number. A product sent to Allied Telesis without a
RMA number will be returned to the sender at the sender’s expense.
Products
To obtain an RMA number, contact the Allied Telesis Technical Support
country from the list displayed on the website. Then select the appropriate
menu tab.
For Sales or You can contact Allied Telesis for sales or corporate information at our
displayed on the website. Then select the appropriate menu tab.
Corporate
Information
Warranty The AT-GS900/16 and AT-GS900/24 switches have a lifetime warranty
(two years for the power supply). Go to www.alliedtelesis.com/warranty
for the specific terms and conditions of the warranty and for warranty
registration.
10
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Management Software Updates
New releases of management software for our managed products are
available from either of the following Internet sites:
If you prefer to download new software from the Allied Telesis FTP server
from your workstation’s command prompt, you will need FTP client
software and you must log in to the server. Enter “anonymous” for the user
name and your email address for the password.
11
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Chapter 1
Product Description
The AT-GS900/16 and AT-GS900/24 switches are unmanaged, Layer 2
Fanless Gigabit Ethernet switches designed to simplify the task of creating
or expanding an Ethernet, Fast Ethernet, or Gigabit Ethernet network.
This chapter contains the follows sections:
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Features
AT-GS900/16 and AT-GS900/24 Fanless Gigabit Ethernet switches
features include:
ˆ 16 or 24 - RJ-45 10/100/1000 Mbps twisted pair ports
ˆ System and port LEDs
ˆ Auto MDI/MDI-X
ˆ Auto-Negotiation
ˆ 10/100/1000 Mbps full or half-duplex
ˆ Back pressure and flow control at half-duplex and IEEE 802.3x flow
control at full-duplex
ˆ Broadcast storm control
ˆ Supports 128K byte packet buffer with a packet length of up to 1522
bytes
ˆ Supports two-way dynamic address learning for 8K MAC addresses
ˆ Supports Jumbo frames of up to 10K bytes
ˆ MAC address aging - 300 seconds
ˆ Non-blocking full wire speed
ˆ Four priority queus per port
ˆ Internal power supply
ˆ Fanless design
Standards
ˆ IEEE 802.3 – 10Base-T
ˆ IEEE 802.3 – CSMA/CD
ˆ IEEE 802.3u – 100Base-TX
ˆ IEEE 802.3ab – 1000Base-TX Gigabit Ethernet
ˆ IEEE 802.3z – Full Duplex
ˆ IEEE 802.3u – Auto-Negotiation
ˆ IEEE 802.3x – Flow Control, Symmetric and Asymmetric
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Chapter 1: Product Description
Components
Figure 1 illustrates the front panels of the AT-GS900/16 and AT-GS900/24
switches.
AT-GS900/16
600
System / Port LEDS
16 - 10/100/1000Base Twisted Pair Ports
AT-GS900/24
601
System / Port LEDS
24 - 10/100/1000Base Twisted Pair Ports
Figure 1. Front Panels
Figure 2 illustrates the back panels of the AT-GS900/16 and AT-GS900/24
switches.
AT-GS900/16
100-240VAC
602
AC Power Connector
AT-GS900/24
100-240VAC
603
AC Power Connector
Figure 2. Back Panels
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Hardware Feature Description
The following sections describe hardware features of the AT-GS900/16
and AT-GS900/24 Fanless Gigabit Ethernet switches:
ˆ System and Port LEDs
ˆ Twisted Pair Ports
ˆ AC Power Connector
Twisted Pair The AT-GS900/16 Fanless Gigabit Ethernet switch features 16 twisted
pair ports, and the AT-GS900/24 Fanless Gigabit Ethernet switch features
24 twisted pair ports.
Ports
Type of Connector
The twisted pair ports feature 8-pin RJ-45 connectors. (For the port
pinouts, refer to RJ-45 Twisted Pair Port Connectors “RJ-45 Twisted Pair
Speed
The ports are 10Base-T, 100Base-TX, and 1000Base-T compliant and are
capable of 10 megabits per second (Mbps), 100 Mbps, and 1000 Mbps
speeds. The ports are IEEE 802.3u Auto-Negotiation compliant. With
Auto-Negotiation, the switch automatically matches the highest possible
common speed between each switch port and each end-node. For
example, if an end-node is capable of only 10 Mbps, the switch sets the
port connected to the end-node to 10 Mbps.
Duplex Mode
Each twisted pair port on the switch can operate in either half- or full
duplex mode. The twisted pair ports are IEEE 802.3u-compliant and will
Auto-Negotiate the duplex mode setting.
Note
For the switch to set the duplex mode for each port correctly, the
end-nodes that you connect to the switch ports should also use
Auto-Negotiation. Otherwise, a duplex mode mismatch can occur,
affecting network performance. For further information, refer to
15
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Chapter 1: Product Description
Maximum Distance
Each twisted pair port has a maximum operating distance of 100 m
(328 feet).
Type of Cabling
For 10 Mbps operation, Category 3 or better 100 ohm shielded or
unshielded twisted pair cabling is required. For 100 or 1000 Mbps
operation, Category 5 and Enhanced Category 5 (5E) 100 ohm shielded
or unshielded twisted pair cabling is required.
Auto MDI/MDI-X
All of the twisted pair ports on the switch are auto-MDI and IEEE 802.3ab-
compatible. When a port's speed and duplex mode are set through Auto-
Negotiation, the port uses the auto-MDI feature to automatically configure
itself as MDI or MDI-X when connected to an end-node. Consequently,
you can use either a straight-through or crossover twisted pair cable when
connecting any network device to a port.
LEDs The system and port LEDs on the front panel of the AT-GS900/16 and
AT-GS900/24 switches display the switch and its port status information.
AT-GS900/16
607
AT-GS900/24
608
Figure 3. Port LEDs
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Table 2 describes the system and port LEDs on the AT-GS900/16 and
AT-GS900/24 switches.
Table 2. System and Port LEDs
LED
State
Green
Description
POWER
The switch is powered ON and operating
normally.
OFF
The switch has no power.
SPD/LINK/
ACT
Solid Green A valid 1000 Mbps link is established on
the port.
Solid
Orange
A valid 10 or 100 Mbps link is
established on the port.
Blinking
Green
A 1000 Mbps packet transmission and
reception is in process on the port.
Blinking
Orange
A 10/100 Mbps packet transmission and
reception is in process on the port.
OFF
No link is established on the port.
FDX/HDX
Solid Green A full-duplex link is established on the
port.
OFF
A half-duplex link is established on the
port.
AC Power Both the AT-GS900/16 and AT-GS900/24 switches have a single AC
power supply socket on the back panel, which has auto-switch AC inputs.
Connector
See Figure 2 on page 14 for an illustration of the back panels. For the input
voltage range, refer to Appendix A, ”Technical Specifications” on page 38.
To power ON or OFF the switch, you connect or disconnect the power
cord.
17
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Chapter 1: Product Description
Ethernet Switching Basics
An Ethernet switch interconnects network devices, such as workstations,
printers, routers, and other Ethernet switches, so that they can
communicate with each other by sending and receiving Ethernet frames.
MAC Address Every hardware device on your network has a unique MAC address. This
address is assigned to the device by the device’s manufacturer. For
Table
example, when you install a Network Interface Card (NIC) in a computer
so that you can connect it to the network, the NIC already has a MAC
address assigned to it by its manufacturer.
Both the AT-GS900/16 and AT-GS900/24 Fanless Gigabit Ethernet
switches can contain up to 8,000 entries on their MAC address tables. The
switch uses the table to store the MAC addresses of the network end-
nodes connected to the ports, along with the port number on which each
address was learned.
A switch learns the MAC addresses of the end-nodes by examining the
source address of each packet received on a port. It adds the address and
port on which the packet was received from the MAC table (if the address
has not already been entered in the table). The result is a table that
contains all the MAC addresses of the devices that are connected to the
switch’s ports, and the port number where each address was learned.
When the switch receives a packet, it also examines the destination
address and, by referring to its MAC address table, determines the port on
which the destination end-node is connected. It then forwards the packet
to the appropriate port and to the end-node. This increases network
bandwidth by limiting each frame to the appropriate port when the
intended end-node is located, freeing the other switch ports for receiving
and transmitting data.
If the switch receives a packet with a destination address that is not in the
MAC address table, it floods the packet to all the ports on the switch. If the
ports have been grouped into virtual LANs, the switch floods the packet
only to those ports which belong to the same VLAN as the port on which
the packet was received. This prevents packets from being forwarded into
inappropriate LAN segments, increasing network security. When the
destination end-node responds, the switch adds its MAC address and port
number to the table.
If the switch receives a packet with a destination address that is on the
same port on which the packet was received, it discards the packet
without forwarding it on to any port. Since both the source end-node and
the destination end-node for the packet are located on the same port on
the switch, there is no reason for the switch to forward the packet.
18
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Duplex Mode Duplex mode refers to how an end-node receives and transmits data. If an
end-node can either receive or transmit data, but not both simultaneously,
the end-node is operating in what is referred to as half-duplex mode. If an
end-node can both receive and transmit data simultaneously, the end-
node is said to be operating in full-duplex mode. Naturally, an end-node
capable of operating in full-duplex can handle data much faster than an
end-node that can only operate in half-duplex mode.
The twisted pair ports on the AT-GS900/16 and AT-GS900/24 switches
can operate in half- or full-duplex mode for 10/100 Mbps and full-duplex for
1000 Mbps. They are IEEE 802.3u-compliant and use Auto-Negotiation to
set the duplex mode setting for you automatically.
Store and An AT-GS900/16 or AT-GS900/24 switch uses store and forward as the
method for receiving and transmitting frames. When a Ethernet frame is
Forward
received on a switch port, the switch does not retransmit the frame from
the destination port until it has received the entire frame and stored the
frame in a port buffer. It then examines the frame to determine if it is a
valid frame. Invalid frames, such as fragments or runts, are discarded by
the switch. This process insures that only valid frames are transmitted
from the switch ports and that damaged frames are not propagated on
your network.
Backpressure and To maintain the orderly movement of data between the end-nodes, an
Ethernet switch may periodically need to signal an end-node to stop
Flow Control
sending data. This can occur under several circumstances. For example, if
two end-nodes are operating at different speeds, the switch, while
transferring data between the end-nodes, might need to instruct the faster
end-node to stop transmitting data to allow the slower end-node to catch
up. An example of this would be when a server operating at 100 Mbps is
sending data to a workstation operating at only 10 Mbps.
How a switch signals an end-node to stop transmitting data differs
depending on the duplex mode of the end-node and switch port. A twisted
pair port operating in half-duplex mode stops an end-node from
transmitting data by forcing a collision. A collision on an Ethernet network
occurs when two end-nodes attempt to transmit data using the same data
link at the same time. A collision causes an end-node to stop sending data,
wait for a brief period of time, and then retransmit the same data. Once the
switch is ready to receive data again, the switch stops forcing collisions.
This is referred to as backpressure.
A port operating in full-duplex mode uses PAUSE frames, as specified in
the IEEE 802.3x standard, to stop the transmission of data from an end-
node. Whenever the switch wants an end-node to stop transmitting data, it
issues this frame. The frame instructs the end-node to cease transmission
for a period of time specified within the frame. The switch continues to
issue PAUSE frames until it is ready again to receive data from the end-
node. This is referred to as flow control.
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Chapter 1: Product Description
Network Topologies
This section illustrates two network topologies that you can create with the
AT-GS900/16 and AT-GS900/24 switches: a power workgroup and
collapsed backbone. Both types of topologies are described below.
Power The topology shown in Figure 4 is commonly referred to as a power
workgroup topology. Each workstation or end-node is connected directly
Workgroup
Topology
to a port on the switch. Each end-node has a dedicated data link to the
switch for best performance and reliability. The devices can operate at
speeds of 10 Mbps, 100 Mbps, or 1000 Mbps.
AT-GS900/16 Fanless Gigabit Ethernet Switch
1280
Legend
10 Mbps
100 Mbps
1000 Mbps
Figure 4. Power Workgroup Topology
20
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Collapsed In the topology illustrated in Figure 5, an AT-GS900/16 switch connects
Fast Ethernet switches that have Gigabit Ethernet uplinks. This type of
Backbone
topology is often referred to as a collapsed backbone topology. The switch
functions as the focal point of the network and transfers an Ethernet frame
between the Fast Ethernet switches only when the destination end-node
for the frame is on a different switch than the end-node that originated the
frame. This reduces the amount of unnecessary data traffic in each
workgroup, freeing up bandwidth and improving network performance.
AT-GS900/16 Fanless Gigabit Ethernet Switch
1281
Fast Ethernet
Switches with
Gigabit Uplinks
1
1
1
2
2
2
3
3
3
4
4
5
4
5
5
6
6
6
7
7
7
8
8
8
Legend
10 Mbps
100 Mbps
1000 Mbps
Figure 5. Collapsed Backbone - Hub Topology
21
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Reviewing Safety Precautions
Please review the following safety precautions before you begin to install
the switch or any of its components. Refer to the “Translated Safety
Statements” document for translated safety statements in your language.
The ꢀ indicates that a translation of the safety statement is available in a
PDF document titled “Translated Safety Statements” (613-000405) on the
included with the documentation CD that is shipped with the product.
Warning: To prevent electric shock, do not remove the cover.
No user-serviceable parts inside. This unit contains hazardous
voltages and should only be opened by a trained and qualified
technician. To avoid the possibility of electric shock, disconnect
electric power to the product before connecting or disconnecting
the LAN cables. ꢀ E1
Warning: Do not work on equipment or cables during periods of
lightning activity. ꢀ E2
Warning: Power cord is used as a disconnection device. To de-
energize equipment, disconnect the power cord. ꢀ E3
Warning: Class I Equipment. This equipment must be earthed.
The power plug must be connected to a properly wired earth
ground socket outlet. An improperly wired socket outlet could
place hazardous voltages on accessible metal parts. ꢀ E4
Pluggable Equipment. The socket outlet shall be installed near
the equipment and shall be easily accessible. ꢀ E5
Caution: Air vents must not be blocked and must have free
access to the room ambient air for cooling. ꢀ E6
Warning: Operating Temperature. This product is designed for a
maximum ambient temperature of 40° degrees C. ꢀ E7
All Countries: Install product in accordance with local and
National Electrical Codes. ꢀ E8
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Chapter 2: Installation
Selecting a Site for the Switch
Observe the following requirements when choosing a site for your switch:
ˆ If you plan to install the switch in an equipment rack, ensure that the
rack is safely secured and that it will not tip over. Devices in a rack
should be installed starting at the bottom, with the heavier devices
near the bottom of the rack.
ˆ If you are installing the switch on a table, ensure that the table is level
and secure.
ˆ The power outlet for the switch should be located near the unit and
should be easily accessible.
ˆ The site should provide for easy access to the ports on the front of the
switch. This will make it easy for you to connect and disconnect
cables, as well as view the switch’s LEDs.
ˆ To allow proper cooling of the switch, air flow around the unit and
through its vents on the side and rear should not be restricted.
ˆ Do not place objects on top of the switch.
ˆ Do not expose the switch to moisture or water.
ˆ Ensure that the site is a dust-free environment.
ˆ You should use dedicated power circuits or power conditioners to
supply reliable electrical power to the network devices.
24
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Planning the Installation
Table 3 contains the cabling specifications for the twisted pair ports.
Table 3. Twisted Pair Cabling and Distances
Maximum
Speed
Type of Cable
Operating
Distance
10 Mbps
Category 3 or better 100-ohm
shielded or unshielded twisted pair
cable
100 m (328 ft)
100 m (328 ft)
100 m (328 ft)
100 Mbps
Category 5 or Category 5E
(Enhanced) 100-ohm shielded or
unshielded twisted pair cable
1000 Mbps
Category 5 and Category 5E
(Enhanced) 100-ohm shielded or
unshielded twisted pair cable
Note
The twisted pair ports on the switch feature Auto-MDI when
operating at either 10, 100, or 1000 Mbps. Each port is individually
configured as MDI or MDI-X when connected to an end-node.
Consequently, you can use either a straight-through or crossover
twisted pair cable when connecting any network device to a twisted
pair port on the switch. For example, a port operating at 10 or 100
Mbps uses two pairs of twisted pair wiring while a port operating at
1000 Mbps uses four pairs of twisted pair wiring.
25
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Chapter 2: Installation
Unpacking the Switch
To unpack an AT-GS900/16 or an AT-GS900/24 switch, perform the
following procedure:
1. Remove all components from the shipping package.
Note
Store the packaging material in a safe location. You must use the
original shipping material if you need to return the unit to Allied
Telesis.
2. Place the switch on a level, secure surface.
3. Ensure the following hardware components are included in your switch
package. If any item is missing or damaged, contact your Allied
Telesis sales representative for assistance.
ˆ One AT-GS900/16 or AT-GS900/24 Fanless Gigabit Ethernet
switch
ˆ Two rackmounting brackets
ˆ Eight flathead Phillips screws
ˆ Four #10-32 Phillips screws with a nylon washer
ˆ Four self-adhesive rubber feet
ˆ AC power cord
ˆ Documentation CD
26
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Installing the Switch on a Table or Desktop
To install the switch on a table or desktop, perform the following
procedure:
1. Remove all the items from the packaging and store the packaging
material in a safe place. In the event a problem occurs and you need to
return the unit, please use as much of the original shipping material as
possible.
2. Attach the four self-adhesive rubber feet to the bottom of the switch, as
606
Figure 6. Attaching the Rubber Feet
3. Place the switch on a flat and secure surface, leaving ample space
around the switch for ventilation.
4. Connected the twisted pair cables to the twisted pair ports.
When connecting a twisted pair cable to a port, observe the following
guidelines:
ˆ An RJ-45 connector should fit snugly into the port on the switch.
The tab on the connector should lock the connector into place.
ˆ Check that you are using the appropriate type of twisted pair
cabling. Refer to “Twisted Pair Cabling and Distances” on page 25
for twisted pair cable specifications.
ˆ Since the twisted pair port, when operating in Auto-Negotiation, is
Auto MDI/MDI-X, you can use either a straight-through or
crossover twisted pair cable to connect any type of network device
to a port on the switch. If you disable Auto-Negotiation on the port,
the port defaults to MDI-X.
5. Apply power to the switch by plugging the AC/DC power adapter into
an AC power outlet, the plug the DC connector to the power receptacle
of the switch.
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Chapter 2: Installation
Warning
The power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord. ꢀ E3
6. Verify that the POWER LED is green. If the LED is OFF, refer to
“Troubleshooting” on page 37 for instructions.
Note
The switch perform a self-diagnostic test upon power up. This takes
about 20 seconds to complete.
7. Power ON the end-nodes connected to the switch.
8. Check that all the SPD/LINK/ACT LEDs are green. If any of the LEDs
The switch is now ready for use.
28
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Installing the Switch on a Wall
To install the switch on a wall, perform the following procedure:
1. Remove all the items from the packaging and store the packaging
material in a safe place. In the event a problem occurs and you need to
return the unit, please use as much of the original shipping material as
possible.
2. Attach the two rackmounting brackets (provided) to the sides of the
switch using the eight flathead Phillips screws (provided), as illustrated
in Figure 7.
1302
Figure 7. Attaching the brackets to the sides of the switch
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Chapter 2: Installation
3. Place the switch on the wall. Then mount the switch using the #10-32
1303
Figure 8. Attaching the switch to the wall
4. Connected the twisted pair cables to the twisted pair ports.
When connecting a twisted pair cable to a port, observe the following
guidelines:
ˆ An RJ-45 connector should fit snugly into the port on the switch.
The tab on the connector should lock the connector into place.
ˆ Check that you are using the appropriate type of twisted pair
cabling. Refer to “Twisted Pair Cabling and Distances” on page 25
for twisted pair cable specifications.
ˆ Since the twisted pair port, when operating in Auto-Negotiation, is
Auto MDI/MDI-X, you can use either a straight-through or
crossover twisted pair cable to connect any type of network device
to a port on the switch. If you disable Auto-Negotiation on the port,
the port defaults to MDI-X.
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
5. Apply power to the switch by plugging the AC/DC power adapter into
an AC power outlet, the plug the DC connector to the power receptacle
of the switch.
Warning
The power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord. ꢀ E3
6. Verify that the POWER LED is green. If the LED is OFF, refer to
“Troubleshooting” on page 37 for instructions.
Note
The switch perform a self-diagnostic test upon power up. This takes
about 20 seconds to complete.
7. Power ON the end-nodes connected to the switch.
8. Check that all the SPD/LINK/ACT LEDs are green. If any of the LEDs
The switch is now ready for use.
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Chapter 2: Installation
Installing the Switch in a Rack
Perform the following procedure to install the switch in a standard 19-inch
rack. If you are not installing the switch in a rack, go to the next procedure.
1. Place the unit upside down on a level, secure surface.
2. Using a flat-head screwdriver, remove the self-adhesive rubber feet
from the bottom of the switch, as shown in Figure 9.
Figure 9. Removing the Feet
3. Turn the switch over.
4. Attach the two rackmounting brackets (provided) to the sides of the
switch using the eight flathead Phillips screws (provided), as illustrated
in Figure 10.
605
Figure 10. Attaching Rackmounting Brackets
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
5. Mount the switch in the 19-inch rack using the #10-32 Phillips screws
which are shipped with the product, as illustrated in Figure 11.
606
Figure 11. Rackmounting the Switch
6. Connected the twisted pair cables to the twisted pair ports.
When connecting a twisted pair cable to a port, observe the following
guidelines:
ˆ An RJ-45 connector should fit snugly into the port on the switch.
The tab on the connector should lock the connector into place.
ˆ Check that you are using the appropriate type of twisted pair
cabling. Refer to “Twisted Pair Cabling and Distances” on page 25
for twisted pair cable specifications.
ˆ Since the twisted pair port, when operating in Auto-Negotiation, is
Auto MDI/MDI-X, you can use either a straight-through or
crossover twisted pair cable to connect any type of network device
to a port on the switch. If you disable Auto-Negotiation on the port,
the port defaults to MDI-X.
7. Apply power to the switch by plugging the AC/DC power adapter into
an AC power outlet, the plug the DC connector to the power receptacle
of the switch.
Warning
The power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord. ꢀ E3
8. Verify that either the POWER LED is green. If the LED is OFF, refer to
“Troubleshooting” on page 37 for instructions.
Note
The switch perform a self-diagnostic test upon power up. This takes
about 20 seconds to complete.
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Chapter 2: Installation
9. Power ON the end-nodes connected to the switch.
10. Check that all the SPD/LINK/ACT LEDs are green. If any of the LEDs
The switch is now ready for use.
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Cabling the Switch
To connect to the ports on the AT-GS900/16 and AT-GS900/24 switches,
perform the following procedure:
1. Connect the twisted pair data cables to the RJ-45 ports on the switch,
as illustrated in Figure 12.
613
Figure 12. Connecting the Twisted Pair Data Cables
When connecting a twisted pair cable to a port, observe the following
guidelines:
ˆ An RJ-45 connector should fit snugly into the port on the switch.
The tab on the connector should lock the connector into place.
ˆ The ports on the switch are auto-MDI/MDI-X. You can use either a
straight-through or crossover twisted pair cable to connect any type
of network device to a port on the switch.
ˆ The network should not contain data loops, which can adversely
affect network performance. A data loop exists when two or more
network devices can communicate with each other over more than
one data path.
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Chapter 2: Installation
Powering On the Switch
To apply power to the AT-GS900/16 and AT-GS900/24 switches, perform
the following procedure:
1. Apply AC power to the switch by plugging the power cord into the AC
power connector on the back panel of the unit, as illustrated in
Figure 13.
Warning
Power cord is used as a disconnection device: To de-energize
equipment, disconnect the power cord. ꢀ E3
100-240
VA
C
~
612
Figure 13. Connecting the AC Power Connector to Switch
2. Plug the other end or the power cord into a wall outlet.
3. Verify that the POWER LED is green. If the LED is OFF, refer to
The switch is ready for network operations.
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Chapter 3
Troubleshooting
This chapter contains information on how to troubleshoot the switch in the
event that a problem occurs.
Note
If you are still unable to resolve the problem after following the
instructions in this chapter, contact ATI Technical Support for
assistance. Refer to “Contacting Allied Telesis” on page 10.
Check the POWER LED on the front of the switch. If the LED is OFF,
indicating that the unit is not receiving power, do the following:
ˆ Ensure that the power cord is securely connected to the power source
and to the AC connector on the back panel of the switch.
ˆ Verify that the power outlet has power by connecting another device
to it.
ˆ Connect the unit to another power source.
ˆ Use a different power cord.
ˆ Verify that the voltage from the power source is within the required
levels for your region.
Verify that the SPD/LINK/ACT LED for each port is ON. If a SPD/LINK/
ACT LED is OFF, do the following:
ˆ Verify that the end-node connected to the port is powered ON and is
operating properly.
ˆ Verify that the twisted pair cable is securely connected to the port on
the switch and to the port on the end-node.
ˆ Ensure that the twisted pair cable does not exceed 100 meters (328
feet).
ˆ Verify that you are using the appropriate category of twisted pair cable:
Category 3 or better for 10 Mbps operation and Category 5 and
Category 5E for 100 and 1000 Mbps operation.
Note
A 1000Base connection can take from five to ten seconds for the link
to be established.
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Appendix A
Technical Specifications
Physical Specifications
Dimensions:
(W x D x H)
AT-GS900/16
330 mm x 230.5 mm x 43 mm
(13.0 in x 9.07 in x 1.7 in)
AT-GS900/24
330 mm x 230.5 mm x 43 mm
(13.0 in x 9.07 in x 1.7 in)
Weight:
AT-GS900/16
AT-GS900/24
2.38 kg (5.25 lbs)
2.99 kg (6.60 lbs)
Environmental Specifications
Operating Temperature:
Storage Temperature:
Operating Humidity:
0° C to 40° C (32° F to 104° F)
-25° C to 70° C (-13° F to 158° F)
5% to 90% non-condensing
5% to 95% non-condensing
Up to 10,000 feet (3,048 meters)
Storage Humidity:
Operating Altitude Range:
Power Specifications
Power Consumption:
AT-GS900/16
15.3 watts maximum
20.1 watts maximum
AT-GS900/24
AC Input Electrical Ratings:
Frequency:
100 - 240V AC, 1A
50/60 Hz
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AT-GS900/16, AT-GS900/24 Fanless Gigabit Ethernet Switches Installation Guide
Safety and Electromagnetic Emissions Certifications
EMI
FCC Class A, CISPR 22 Class A,
EN55022 Class A, C-TICK
Immunity
EN55024
Safety
UL 60950 (CULUS), EN60950-1 (TUV)
Quality and Reliability:
AT-GS900/16 MTBF – 280,000 hours
AT-GS900/24 MTBF – 230,000 hours
Compliance Standards
IEEE 802.3 – 10Base-T
IEEE 802.3u – 100Base-TX
IEEE 802.3ab – 1000Base-TX Gigabit Ethernet
IEEE 802.3z – Full Duplex
IEEE 802.3u – Auto-Negotiation
IEEE 802.3x – Flow Control, Symmetric and Asymmetric
RJ-45 Twisted Pair Port Connectors
This section lists the connectors and connector pinouts for the
AT-GS900/16 and AT-GS900/24 Fanless Gigabit Ethernet Switches and
their components.
Figure 14 illustrates the pin layout to an RJ-45 connector and port.
8
8
1
1
Figure 14. RJ-45 Connector and Port Pin Layout
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Appendix A: Technical Specifications
Table 4 lists the RJ-45 pin signals when a twisted pair port is operating in
the MDI configuration.
Table 4. MDI Pin Signals (10Base-T or 100Base-TX)
Pin
Signal
1
2
3
6
TX+
TX-
RX+
RX-
Table 5 lists the RJ-45 port pin signals when a twisted pair port is
operating in the MDI-X configuration.
Table 5. MDI-X Pin Signals (10Base-T or 100Base-TX)
Pin
Signal
1
2
3
6
RX+
RX-
TX+
TX-
Table 6 lists the RJ-45 connector pins and their signals when a
1000Base-T port is operating at 1000 Mbps.
Table 6. RJ-45 1000Base-T Connector Pinoutsa
Pin
Pair
Signal
TX and RX+
1
2
3
4
5
6
7
8
1
1
2
3
3
2
4
4
TX and RX-
TX and RX+
TX and RX+
TX and RX-
TX and RX-
TX and RX+
TX and RX-
a. Bi-directional data on each pair.
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