Allied Telesis AT-GS924 User Manual
Gigabit
Ethernet
®
Switches
AT-GS916
AT-GS924
Installation
Guide
PN 613-50572-00 Rev A
Copyright © 2004 Allied Telesyn, Inc.
www.alliedtelesyn.com
All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn, Inc.
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 Emission Statement
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 the 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 by the manufacturer or the FCC can void your right to
operate this equipment.
Canadian Department of Communications
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment
Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du
Canada.
RFI Emission FCC Class A, EN55022 Class A, VCCI Class A, C-TICK 1
Warning: In a domestic environment this product may cause radio interference in which case the user may be
required to take adequate measures. 2
Immunity EN55024 3
Electrical Safety EN60950 (TUV), UL60950 (
Important: Appendix Bcontains 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 Benthält übersetzte Sicherheitshinweise für die Installation dieses Geräts. Wenn Sie sehen,
schlagen Sie in Anhang B den übersetzten Sicherheitshinweis in Ihrer Sprache nach.
Vigtigt: Tillæg B indeholder oversatte sikkerhedsadvarsler, der vedrører installation af dette udstyr. Når De ser
symbolet , skal De slå op i tillæg B og finde de oversatte sikkerhedsadvarsler i Deres eget sprog.
Belangrijk: Appendix B bevat vertaalde veiligheidsopmerkingen voor het installeren van deze apparatuur. Wanneer
u de ziet, raadpleeg Appendix B voor vertaalde veiligheidsinstructies in uw taal.
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.
Tärkeää: Liite B sisältää tämän laitteen asentamiseen liittyvät käännetyt turvaohjeet. Kun näet -symbolin, katso
käännettyä turvaohjetta liitteestä B.
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.
Viktig: Tillegg B inneholder oversatt sikkerhetsinformasjon for installering av dette utstyret. Når du ser , åpner du
til Tillegg C for å finne den oversatte sikkerhetsinformasjonen på ønsket språk.
Importante: O Anexo B contém advertências de segurança traduzidas para instalar este equipamento. Quando vir o
símbolo , leia a advertência de segurança traduzida no seu idioma no Anexo B.
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.
Obs! Bilaga B innehåller översatta säkerhetsmeddelanden avseende installationen av denna utrustning. När du ser
, skall du gå till Bilaga B för att läsa det översatta säkerhetsmeddelandet på ditt språk.
cULus
), CE 4
3
Table of Contents
Electrical Safety and Emission Statement ...............................................................................................................................................3
Preface ...................................................................................................................................................................................................................... 6
How This Guide is Organized ............................................................................................................................................................................. 6
Document Conventions ...................................................................................................................................................................................... 7
Contacting Allied Telesyn ................................................................................................................................................................................... 8
Online Support............................................................................................................................................................................................... 8
Email and Telephone Support.................................................................................................................................................................. 8
Returning Products....................................................................................................................................................................................... 8
For Sales or Corporate Information ........................................................................................................................................................ 8
Chapter 1
Product Description ...........................................................................................................................................................................................9
Features ...................................................................................................................................................................................................................10
Components ..........................................................................................................................................................................................................11
Hardware Feature Description ........................................................................................................................................................................12
Twisted Pair Ports ........................................................................................................................................................................................ 12
LEDs.................................................................................................................................................................................................................. 13
AC Power Connector.................................................................................................................................................................................. 14
A Few Ethernet Switching Basics ....................................................................................................................................................................15
MAC Address Table..................................................................................................................................................................................... 15
Duplex Mode................................................................................................................................................................................................. 16
Store and Forward....................................................................................................................................................................................... 16
Backpressure and Flow Control ............................................................................................................................................................. 16
Network Topologies ............................................................................................................................................................................................18
Power Workgroup Topology................................................................................................................................................................... 18
Collapsed Backbone................................................................................................................................................................................... 19
Chapter 2
Installation ............................................................................................................................................................................................................20
Reviewing Safety Precautions .........................................................................................................................................................................21
Selecting a Site for the Switch .........................................................................................................................................................................22
Planning the Installation ...................................................................................................................................................................................23
Unpacking the Switch ........................................................................................................................................................................................24
Installing the Power Cord Retaining Clip (AC Switches Only) ..............................................................................................................25
Installing the Switch in a Rack .........................................................................................................................................................................27
Cabling the Switch ...............................................................................................................................................................................................29
Powering On the Switch ....................................................................................................................................................................................30
Warranty Registration .........................................................................................................................................................................................32
4
Chapter 3
Troubleshooting ................................................................................................................................................................................................ 33
Appendix A
Technical Specifications .................................................................................................................................................................................35
Physical Specifications .......................................................................................................................................................................................35
Environmental Specifications ..........................................................................................................................................................................35
Power Specifications ..........................................................................................................................................................................................36
Safety and Electromagnetic Emissions Certifications .............................................................................................................................36
Connectors .............................................................................................................................................................................................................37
RJ-45 Twisted Pair Port Pinouts ............................................................................................................................................................. 37
Appendix B
Translated Electrical Safety and Emission Information .................................................................................................................. 39
5
Preface
This guide contains the hardware installation instructions for the
AT-GS916 and AT-GS924 Gigabit Ethernet Switches.
How This Guide is Organized
This manual contains the following chapters and appendices:
Chapter 1, ”Product Description”, describes the features and
components of the switches.
Chapter 2, ”Installation”, contains the installation instructions for the
switches.
Chapter 3, ”Troubleshooting”, provides information on how to resolve
problems that might occur with the switches.
Appendix A, ”Technical Specifications”, contains the technical
specifications for the switches.
Appendix B, ””, contains translations of the warnings and cautions in the
manual.
6
Document Conventions
This document uses the following conventions to highlight important
information:
Note
Notes provide additional information.
Warning
Warnings inform you that performing or omitting a specific action
may result in bodily injury.
Caution
Cautions inform you that performing or omitting a specific action
may result in equipment damage or loss of data.
AT-GS916 and AT-GS924 Gigabit Ethernet Switches Installation Guide
7
Preface
Contacting Allied Telesyn
This section provides Allied Telesyn contact information for technical
support as well as sales or corporate information.
Online Support You can request technical support online by accessing the Allied Telesyn
Knowledge Base from the following web site:
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
For Sales or
Corporate
Information
For Technical Support via email or telephone, refer to the Support &
Services section of the Allied Telesyn web site:
http://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 a
RMA number will be returned to the sender at the sender’s expense.
To obtain a RMA number, contact Allied Telesyn’s Technical Support at
our web site: http://www.alliedtelesyn.com.
You can contact Allied Telesyn for sales or corporate information at our
web site: http://www.alliedtelesyn.com. To find the contact
information for your country, select “Contact Us”, then “Worldwide
Contacts”.
8
Chapter 1
Product Description
The AT-GS916 and AT-GS924 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 10
”Components” on page 11
”Hardware Feature Description” on page 12
”A Few Ethernet Switching Basics” on page 15
”Network Topologies” on page 18
9
Product Description
Features
AT-GS916 and AT-GS924 Gigabit Ethernet switches features include:
16 or 24 - 10/100/1000 Mbps twisted pair ports
System and port LEDs
Auto MDI/MDI-X
Auto-Negotiation (IEEE 802.3u-compliant)
10/100 Mbps full or half-duplex, and 1000 Mbps full duplex
Back pressure and flow control (IEEE 802.3x-compliant)
Broadcast storm control
Full wire-speed switching with Head of Line (HOL) blocking
prevention
Support 128K byte packet buffer with the length of packet up to
1522 byte
Support two-way dynamic address learning for 8K MAC addresses
10
Components
AT-GS916 and AT-GS924 Gigabit Ethernet Switches Installation Guide
Figure 1 illustrates the front panels of the AT-GS916 and AT-GS924
switches.
AT-GS916
AT-GS916
10/100/1000Base-T Gigabit Ethernet Switch
POWER
123 4 5 6 7 8 910111213141516
System / Port LEDS
1357
10
1000
100
ACT
FDX
2 4 6 8 10 12 14 16
16 - 10/100/1000Base Twisted Pair Ports
9111315
AT-GS924
AT-GS924
10/100/1000Base-T Gigabit Ethernet Switch
POWER
123456789101112131415161718192021222324
1357
10
1000
100
ACT
FDX
2468
24 - 10/100/1000Base Twisted Pair PortsSystem / Port LEDS
9111315
10 12 14 16
17 19 21 23
18 20 22 24
Figure 1 Front Panels
Figure 1 illustrates the back panels of the AT-GS916 and AT-GS924
switches.
AT-GS916
AT-GS924
100-240VAC
AC Power Connector
Figure 2 Back Panels
~
100-240VAC
~
AC Power Connector
11
Product Description
Hardware Feature Description
The following sections describe hardware features of the AT-GS916 and
AT-GS924 Gigabit Ethernet switches:
System and Port LEDs
Twisted Pair Ports
AC Power Connector
Twisted Pair
Ports
The AT-GS916 Gigabit Ethernet switch features 16 twisted pair ports, and
the AT-GS924 Gigabit Ethernet switch features 24 twisted pair 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 Pinouts” on page 37.
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
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 16.
12
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.
AT-GS916 and AT-GS924 Gigabit Ethernet Switches Installation Guide
AT-GS916
10/100/1000Base-T Gigabit Ethernet Switch
POWER
123 4 5 6 7 8 9 10111213141516
10
ACT
FDX
100
1000
POWER
10
ACT
FDX
100
1000
123456789101112131415161718192021222324
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-GS916 and AT-
GS924 switches display the switch and its port status information. Each
port has four LEDs.
AT-GS916
AT-GS924
Figure 3 Port LEDs
Table 1 describes the system and port LEDs on the AT-GS916 and
AT-GS924 Gigabit Ethernet switches.
Table 1 System and Port LEDs
LED State Description
POWER Green The switch is powered ON.
OFF The switch is powered OFF.
10 Green The port is operating at 10 Mbps.
100 Green The port is operating at 100 Mbps.
OFF When both 10 and 100 LEDs are OFF,
the port is operating at 1000 Mbps.
13
Product Description
Table 1 System and Port LEDs
LED State Description
ACT Green A valid link has been established
between the port and the end-node.
AC Power
Connector
Flashing
Green
The port is transmitting and/or
receiving data packets.
OFF There is no link established between
the port and the end-node.
FDX Green The port is operating in full-duplex
mode.
OFF The port is operating in half-duplex
mode.
Both AT-GS916 and AT-GS924 Gigabit Ethernet switches have a single
AC power supply socket on the back panel, which has an autoswitch AC
inputs. Refer to ”Technical Specifications” on page 35, for the input
voltage range. To power ON or OFF the switch, you connect or
disconnect the power cord.
14
A Few 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.
AT-GS916 and AT-GS924 Gigabit Ethernet Switches Installation Guide
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 AT-GS916 and AT-GS924 Gigabit Ethernet switches can contain up
to 8,000 entries on its MAC address table. 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, increasing network
security. When the destination end-node responds, the switch adds its
MAC address and port number to the table.
15
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