trademark of Netscape Communications Corporation. All other product names, company names, logos or other designations
mentioned herein are trademarks or registered trademarks of their respective owners.
Allied Telesyn, Inc. reserves the right to make changes in specifications and other information contained in this document
without prior written notice. The information provided herein is subject to change without notice. In no event shall Allied Telesyn,
Inc. be liable for any incidental, special, indirect, or consequential damages whatsoever, including but not limited to lost profits,
arising out of or related to this manual or the information contained herein, even if Allied Telesyn, Inc. has been advised of,
known, or should have known, the possibility of such damages.
Electrical Safety and Emissions Standards
This product meets the following standards.
U.S. Federal Communications Commission
Declaration of Conformity
Manufacturer Name: Allied Telesyn, Inc.
Declares that the product: Gigabit Ethernet Switches
Model Numbers: AT-GS900/8, AT-GS900/8E
This product complies with FCC Part 15B, Class B Limits:
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device
must not cause harmful interference, and (2) this device must accept any interference received, including interference
that may cause undesired operation.
Radiated Energy
Note: This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15
of FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with instructions, may cause harmful interference to radio or television reception, which can be determined
by turning the equipment off and on. The user is encouraged to try to correct the interference by one or more of the
following measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment and the receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
-Consult the dealer or an experienced radio/TV technician for help.
Changes and modifications not expressly approved by the manufacturer or registrant of this equipment can void your
authority to operate this equipment under Federal Communications Commission rules.
Industry Canada
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.
RFI EmissionsFCC Class B, EN55022 Class B, EN61000-3-2, EN61000-3-3,
VCCI Class B, C-TICK, CE
ImmunityEN55024
Electrical SafetyEN60950 (TUV), UL 60950 (
CULUS
)
3
Translated Safety Statements
Important: Appendix B contains translated safety statements for installing this equipment. When
you see the , go to Appendix B for the translated safety statement in your language.
Wichtig: Anhang B enthält übersetzte Sicherheitshinweise für die Installation dieses Geräts. Wenn
Sie sehen, schlagen Sie in Anhang B den übersetzten Sicherheitshinweis in Ihrer Sprache nach.
Importante: El Apéndice B contiene mensajes de seguridad traducidos para la instalación de este
equipo. Cuando vea el símbolo , vaya al Apéndice B para ver el mensaje de seguridad traducido
a su idioma.
Important : L'annexe B contient les instructions de sécurité relatives à l'installation de cet
équipement. Lorsque vous voyez le symbole , reportez-vous à l'annexe B pour consulter la
traduction de ces instructions dans votre langue.
Importante: l’Appendice B contiene avvisi di sicurezza tradotti per l’installazione di questa
apparecchiatura. Il simbolo , indica di consultare l’Appendice B per l’avviso di sicurezza nella
propria lingua.
Важно: Приложение B содержит переведенную инструкцию побезопасностиприустановке
данного устройства. Если Вы встретите , перейдите к Приложению B для получения
переведенной инструкции по безопасности.
Safety Symbols Used in this Document................................................................................................................................12
Where to Find Web-based Guides .......................................................................................................................................13
Online Support ..............................................................................................................................................................14
Email and Telephone Support.......................................................................................................................................14
Sales or Corporate Information .....................................................................................................................................14
Features ...............................................................................................................................................................................16
Front and Back Panels .........................................................................................................................................................17
Power Supplies.....................................................................................................................................................................21
MAC Address Table ......................................................................................................................................................22
Store and Forward.........................................................................................................................................................23
Back Pressure and Flow Control...................................................................................................................................24
Power Workgroup Topology ..........................................................................................................................................25
Selecting a Site for the Switch..............................................................................................................................................30
Unpacking the Switch ...........................................................................................................
Using a Switch on a Desktop................................................................................................................................................34
Installing the Power Cord Retaining Clip on the AT-GS900/8L Switch.................................................................................35
Mounting a Switch on the Wall .............................................................................................................................................37
Installing a Switch in a Rack .................................................................................................................................................39
Wiring the Switch..................................................................................................................................................................41
Powering On a Switch ..........................................................................................................................................................42
Powering On an AT-GS900/8 Switch............................................................................................................................42
Powering On an AT-GS900/8E Switch..........................................................................................................................43
Power Specifications ............................................................................................................................................................47
Safety and Electromagnetic Emissions Certifications...........................................................................................................47
Connectors and Port Pinouts................................................................................................................................................48
Figure 1. AT-GS900/8 and AT-GS900/8E Front Panels......................................................................................................17
Figure 2. AT-GS900/8 and AT-GS900/8E Back Panels ......................................................................................................17
Figure 3. AT-GS900/8 and AT-GS900/8E System and Port LEDs......................................................................................19
Figure 4. External Power Adapter for the AT-GS900/8E Model..........................................................................................21
Figure 5. Power Workgroup Topology.................................................................................................................................25
Figure 7. Attaching the Rubber Feet ...................................................................................................................................34
Figure 8. Power Cord Retaining Clip ...................................................................................................................................35
Figure 9. Power Cord Retaining Bracket .............................................................................................................................35
Figure 10. Inserting the Retaining Clip into the Retaining Bracket ......................................................................................36
Figure 11. Retaining Clip Installed in the Retaining Bracket................................................................................................36
Figure 12. Aligning an AT-GS900/8E Switch for Mounting on the Wall...............................................................................37
Figure 13. Mounting an AT-GS900/8E Switch on the Wall..................................................................................................38
Figure 14. Attaching the Rack-Mount Bracket.....................................................................................................................39
Figure 15. Connecting the Twisted Pair Data Cables..........................................................................................................41
Figure 16. Power Cord Retaining Clip in the Up Position....................................................................................................42
Figure 17. Plugging in the AC Power Cord..........................................................................................................................42
Figure 18. Securing the Power Cord with the Retaining Clip...............................................................................................43
Figure 19. Connecting the Power Adapter...........................................................................................................................43
Figure 20. RJ-45 Connector and Port Pin Layout................................................................................................................48
Table 2. System and Port LED Descriptions ......................................................................................................................19
Table 3. Twisted Pair Cabling and Distances .....................................................................................................................31
Table 4. MDI Pin Signals (10Base-T or 100Base-TX) ........................................................................................................48
Table 5. MDI-X Pin Signals (10Base-T or 100Base-TX) ....................................................................................................48
This guide contains instructions on how to configure and maintain the
AT-GS900/8 and AT-GS900/8E switches. This preface contains the
following sections:
“Safety Symbols Used in this Document” on page 12
“Where to Find Web-based Guides” on page 13
“Contacting Allied Telesyn” on page 14
11
Preface
Safety Symbols Used in this Document
This document uses the safety symbols defined in Table 1.
Table 1. Safety Symbols
SymbolMeaningDescription
CautionPerforming or omitting a specific action may
result in equipment damage or loss of data.
WarningPerforming or omitting a specific action may
result in electrical shock.
12
Where to Find Web-based Guides
The installation and user guides for all Allied Telesyn products are
available in portable document format (PDF) on our web site at
www.alliedtelesyn.com. You can view the documents online or download
them onto a local workstation or server.
AT-GA900/8 and AT-GA900/8E Gigabit Ethernet Switches Installation Guide
13
Preface
Contacting Allied Telesyn
This section provides Allied Telesyn contact information for technical
support as well as sales and corporate information.
Online SupportYou can request technical support online by accessing the Allied Telesyn
Knowledge Base: http://kb.alliedtelesyn.com. You can use the
Knowledge Base to submit questions to our technical support staff and
review answers to previously asked questions.
Email and
Telephone
Support
Returning
Products
Sales or
Corporate
Information
Management
Software Updates
For Technical Support via email or telephone, refer to the Support &
Services section of the Allied Telesyn web site: www.alliedtelesyn.com.
Products for return or repair must first be assigned a return materials
authorization (RMA) number. A product sent to Allied Telesyn without an
RMA number will be returned to the sender at the sender’s expense.
To obtain an RMA number, contact Allied Telesyn Technical Support
through our web site: www.alliedtelesyn.com.
You can contact Allied Telesyn for sales or corporate information through
our web site: www.alliedtelesyn.com. To find the contact information for
your country, select Contact Us -> Worldwide Contacts.
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 Telesyn 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.
Chapter 1
Overview
The AT-GS900/8 and AT-GS900/8E switches are unmanaged, Layer 2
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:
“Features” on page 16
“Front and Back Panels” on page 17
“Ports” on page 18
“LEDs” on page 19
“Power Supplies” on page 21
“Ethernet Switching Basics” on page 22
“Network Topologies” on page 25
15
Chapter 1: Overview
Features
The features of the AT-GS900/8 and AT-GS900/8E switches include:
LEDs for unit and port status
Eight Auto-Negotiating 10/100/1000Base-T twisted pair ports with
RJ-45 connectors
External power adapter (for AT-GS900/8LE model only)
Auto MDI/MDI-X on all ports
IEEE 802.3 and IEEE 802.3u compliant
IEEE 802.3x flow control in full-duplex operation; back pressure and
flow control in half-duplex operation
Store and forward switching mode
MAC address table capacity of up to 4K addresses with automatic
aging
16
Front and Back Panels
Figure 1 illustrates the front panels of the AT-GS900/8 and AT-GS900/8E
switches.
AT-GS900/8
AT-GA900/8 and AT-GA900/8E Gigabit Ethernet Switches Installation Guide
/001
/01
AT-GS900/8E
M01
001
09SG-TA
8/0
1
hct
iwStenrehtEtibagiGT-ESAB000
M0
M0
01
TCA/KNIL
WOP
XDF
RE
1
2
345
876
Port LEDs
M01
00
M0
1
M001
TC
A/KNIL
XDF
1
2
5
3
P
REWO
4
Port LEDs
1
6
87
2
1
3
10/100/1000Base Twisted Pair Ports
2
3
1
4
10/100/1000Base Twisted Pair Ports
E8/009SG-TA
hctiwStenrehtEtibagiGT-ESAB0001/001/0
6
5
4
7
6
5
8
561
7
8
560
Figure 1. AT-GS900/8 and AT-GS900/8E Front Panels
Figure 2 illustrates the back panels of the AT-GS900/8 and AT-GS900/8E
switches.
AT-GS900/8
AT-GS900/8E
100-240V~ 50-60Hz 0.6A
+
5-12V DC
Figure 2. AT-GS900/8 and AT-GS900/8E Back Panels
17
Chapter 1: Overview
Ports
The AT-GS900/8 and AT-GS900/8E switches feature eight twisted pair
ports.
The twisted pair ports feature 8-pin RJ-45 connectors. (For the port
pinouts, refer to “Connectors and Port Pinouts” on page 48.
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.
Each twisted pair port on the switch can operate in either half- or fullduplex mode. The twisted pair ports are IEEE 802.3u-compliant and will
Auto-Negotiate the duplex mode setting.
Note
In order 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
“Duplex Mode” on page 22.
Each twisted pair port has a maximum operating distance of 100 m
(328 feet).
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.
The twisted pair ports are auto-MDI. They automatically configure
themselves as either MDI or MDI-X. This feature allows you to use either
straight-through or crossover twisted pair cables to connect devices to the
ports.
18
LEDs
M0
01
TCA/KNIL
XDF
REWO
P
2
8/0
09SG
-TA
hctiwStenrehtEtibagiGT-ESAB0001/001/01
M01
M0001
1
345
876
M001
TC
A/KNIL
XDF
REWO
P
2
E8/009SG-TA
hctiwStenrehtEtibagiGT-ESAB0001/001/0
1
M01
M000
1
1
345
87
6
2
1
3
4
AT-GA900/8 and AT-GA900/8E Gigabit Ethernet Switches Installation Guide
The LEDs on the front panel display the system and port status
information. Each port has four LEDs as shown in Figure 3.
AT-GS900/8
562
AT-GS900/8E
563
Figure 3. AT-GS900/8 and AT-GS900/8E System and Port LEDs
Table 2 describes the AT-GS900/8 and AT-GS900/8E system and port
LEDs.
Table 2. System and Port LED Descriptions
LEDStateDescription
POWEROffThe switch is not receiving power.
OnThe switch is receiving power.
10MSolid GreenThe port is operating at 10 Mbps.
100MSolid GreenThe port is operating at 100 Mbps.
10M and
Solid GreenThe port is operating at 1000 Mbps.
100M
LINK/ACTOffThe port has not established a link with an
end node.
Blinking
The port is transmitting or receiving data.
Green
GreenA valid link has been established on the port.
19
Chapter 1: Overview
Table 2. System and Port LED Descriptions (Continued)
LEDStateDescription
FDXOffThe port is operating in half-duplex mode.
GreenThe port is operating in full-duplex mode.
20
Power Supplies
AT-GA900/8 and AT-GA900/8E Gigabit Ethernet Switches Installation Guide
The AT-GS900/8 switch has a single AC power supply socket on the back
panel which features autoswitch AC inputs. To power the switch on or off,
connect or disconnect the power cord provided with the switch.
The AT-GS900/8E switch uses an external AC/DC power adapter
provided with the switch, as shown in Figure 4.
Figure 4. External Power Adapter for the AT-GS900/8E Model
Note
For the power requirements, refer to “Power Specifications” on
page 47.
21
Chapter 1: Overview
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
Table
Every hardware device on your network has a unique MAC address. This
address is assigned to the device by the device’s manufacturer. For
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.
The MAC address table in the AT-GS900/8 and AT-GS900/8E switches
can store up to 4K MAC addresses. 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 to the MAC table if the address had
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 on 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, decreasing 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.
Duplex ModeDuplex mode refers to how an end node receives and transmits data. If an
22
AT-GA900/8 and AT-GA900/8E Gigabit Ethernet Switches Installation Guide
end node can 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-GS900/8 and AT-GS900/8E switches can
operate in either half-or full-duplex mode. They are IEEE 802.3u-compliant
and use Auto-Negotiation to set the duplex mode setting for you
automatically.
For Auto-Negotiation to operate properly on a switch, the end nodes
connected to the switch should also use Auto-Negotiation. If an end node
does not have this feature and has a fixed duplex mode of full-duplex, the
result will be a duplex mode mismatch between the end node and a switch
port. A port on the Gigabit Ethernet switch connected to an end node with
a fixed duplex mode of full-duplex will operate at only half-duplex. This
results in the end node using full-duplex and the switch port using halfduplex. This can produce network performance problems. Should you
encounter this situation, you must configure the port on the end node to
use Auto-Negotiation or, if it lacks that feature, to half-duplex.
Store and
Forward
Note
Since the ports on the AT-GS900/8 and AT-GS900/8E switches
operate in Auto-Negotiate mode only, the end nodes connected to
the AT-GS900/8 or AT-GS900/8E switch must also be configured to
operate in the Auto-Negotiate mode. If an end node is configured to
a specific duplex in a manual mode, it will not respond to the AutoNegotiate protocol from the AT-GS900/8 or AT-GS900/8E switch.
(The speed is determined from the link pulses, however, so the
speed is always detected correctly.) As a result, the port setting on
the AT-GS900/8 or AT-GS900/8E switch will end up at half-duplex. If
the end node is manually configured to full-duplex, there will be a
duplex mismatch and data will be lost. If the end node is manually
configured to half-duplex, both ports will have the speed and duplex
match up correctly.
The AT-GS900/8 and AT-GS900/8E switches use store and forward as
the method for receiving and transmitting frames. When a Ethernet frame
is received on a switch port, the switch does not retransmit the frame out
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 insures that only valid frames are transmitted out the
switch ports and that damaged frames are not propagated on your
network.
23
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