Allied Telesis AT FS708LE AT-FS708LE AT-FS708LE User manual

AT-FS708LE
Fast Ethernet Switch
Version 2
Installation Guide
PN 613-50636-00 Rev A

Copyright © 2004 Allied Telesyn, Inc.
All rights reserved. No part of this publication may be
reproduced without prior written permission fromAllied
Telesyn International, Corp.
Ethernet is a registered trademark of Xerox 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 AlliedTelesyn International, Corp. 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.

3
ElectricalSafetyandEmission
Statement
Standards: This product meets the following standards.
U.S. Federal Communications Commission
DECLARATION OF CONFORMITY
Manufacture Name: Allied Telesyn, Inc.
Manufacture Address: 960 Stewart Drive, Suite B
Sunnyvale, CA 94086 USA
Manufacture Telephone: [phone]
Declares that the product: Fast Ethernet Switch
Model Number: AT-FS708LE Version 2
This product complies with FCC Part 15, 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.

4
RFI Emission FCC Part 15, EN55022,
C-Tick, CISPR 22, VCCI
(Class B) 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 UL 1950, CSA C22.2
No. 950, EN60950 4
Important: Appendix A contains translated safety
statements for installing this equipment. When you see the
, go to Appendix A for the translated safety statement in
your language.
Wichtig: Anhang A enthält übersetzte Sicherheitshinweise
für die Installation dieses Geräts. Wenn Sie sehen,
schlagenSiein AnhangAdenübersetzten Sicherheitshinweis
in Ihrer Sprache nach.
- Connect the equipment into an outlet on a circuit
different from that to which the receiver is connected.
- Consult the dealer oran 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.

AT-FS708LE Installation Guide
5
Vigtigt: Tillæg A indeholder oversatte sikkerhedsadvarsler,
der vedrører installation af dette udstyr. Når De ser symbolet
, skal De slå op i tillæg A og finde de oversatte
sikkerhedsadvarsler i Deres eget sprog.
Belangrijk: Appendix A bevat vertaalde
veiligheidsopmerkingen voor het installeren van deze
apparatuur. Wanneer u de ziet, raadpleeg Appendix A
voor vertaalde veiligheidsinstructies in uw taal.
Important: L'annexe A contient les instructions de sécurité
relatives à l'installation de cet équipement. Lorsque vous
voyez le symbole , reportez-vous à l'annexe A pour
consulter la traduction de ces instructions dans votre langue.
Tärkeää: Liite A sisältää tämän laitteen asentamiseen
liittyvätkäännetytturvaohjeet.Kunnäet -symbolin,katso
käännettyä turvaohjetta liitteestä A.
Importante: l’Appendice A contiene avvisi di sicurezza
tradotti per l’installazione di questa apparecchiatura. Il
simbolo , indica di consultare l’Appendice A per l’avviso di
sicurezza nella propria lingua.
Viktig: Tillegg A inneholder oversatt sikkerhetsinformasjon
for installering av dette utstyret. Når du ser , åpner du til
Tillegg A for å finne den oversatte sikkerhetsinformasjonen
på ønsket språk.
Importante: O Anexo A contém advertências de segurança
traduzidas para instalar este equipamento. Quando vir o
símbolo , leia a advertência de segurança traduzida no seu
idioma no Anexo A.
Importante: El Apéndice A contiene mensajes de seguridad
traducidos para la instalación de este equipo. Cuando vea el
símbolo , vaya al Apéndice A para ver el mensaje de
seguridad traducido a su idioma.
Obs! Bilaga A innehåller översatta säkerhetsmeddelanden
avseende installationen av denna utrustning. När du ser ,
skall du gå till Bilaga A för att läsa det översatta
säkerhetsmeddelandet på ditt språk.

7
Table of Contents
Electrical Safety and
Emission Statement ....................................3
Welcome to Allied Telesyn.........................9
Where to Find Web-based Guides ..................9
Document Conventions...................................9
Contacting Allied Telesyn..............................10
Online Support........................................10
E-mail and Telephone Support...............11
Returning Products.................................11
For Sales or Corporate Information.......11
AT-FS708LE Fast Ethernet Switch.........13
Overview.........................................................13
Key Features...................................................14
Status LEDs ...................................................15
Power Supply..................................................16
Store and Forward..........................................16
Back Pressure and Flow Control...................16
Twisted Pair Ports..........................................18
Port Speed ...............................................18
Duplex Mode............................................19
Auto MDI/MDI-X............................................20
Network Topologies........................................22
Standalone Topology...............................22

8
Cascade Topology ....................................23
Planning the Installation...............................24
Verifying the Package Contents.............24
Selecting a Site........................................25
Reviewing Safety Guidelines..................26
Installing the Unit on a Desktop...................28
Installing the Unit on a Wall.........................29
Warranty Registration...................................31
Troubleshooting..............................................31
Technical Specifications.................................33
Appendix A
Translated Safety and Emission
Information ..................................................35

9
Welcome to Allied Telesyn
This guide contains instructions on how to
install an Allied Telesyn AT-FS708LE Fast
Ethernet Switch.
Where to Find Web-based Guides
The Allied Telesyn web site at
www.alliedtelesyn.com offers you an easy
way to access the most recent documentation,
software, and technical information for all of
our products. For product guides, select
“Support & Services” from our web site.
Document Conventions
This guide uses the following conventions:
Note
Notes provide additional information.

10
Caution
Cautions informs you that performing or
omitting a specific action may result in
equipment damage or loss of data.
Warning
Warnings informs you that performing or
omitting a specific action may result in
bodily injury.
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.

AT-FS708LE Installation Guide
11
E-mail and Telephone Support
For Technical Support via E-mail or telephone,
refer to the Support & Services section of the
Allied Telesyn web site:
http://www.alliedtelesyn.com.
Returning Products
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.
For Sales or Corporate Information
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.”

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AT-FS708LE Fast Ethernet
Switch
Overview
The AT-FS708LE unit is a 10Base-T/
100Base-TX Fast Ethernet Switch. The unit
provides you with a simple, cost-effective
solution for Ethernet switching between end-
nodes operating at either 10 or 100 Mbps.
Figure 1 and Figure 2 show the front and back
panels of the switch.
Figure 1 Front Panel
Port LEDs DC Power
Connector
PWR
100M
LNK/ACT
FDX
9-12V DC
10BASE-T/100BASE-TX 8 PORT FAST ETHERNET SWITCH
12345678
+
_

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Figure 2 Back Panel
Key Features
The AT-FS708LE Ethernet Switch has the
following features:
❑LEDs for unit and port status
❑8 Auto-Negotiating 10/100 Mbps twisted
pair ports with RJ-45 connectors
❑Auto MDI/MDI-X on all ports
❑IEEE 802.3 and IEEE 802.3u compliant
❑Store and forward switching mode
❑MAC address table capacity of up to 4,000
entries
❑IEEE 802.3x flow control in full-duplex
operation and back pressure flow control
in half-duplex operation
❑External power adapter
❑Desktop or wall-mount installation
5x 4x 3x 2x 1x
6x
7x
8x

AT-FS708LE Installation Guide
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Status LEDs
Refer to Table 1 for a description of the device
LEDs.
Table 1 LED Functions
LEDs Color Description
PWR Green Indicates the switch is
receiving power.
100M Green
OFF
Indicatestheportisoperating
at 100 Mbps.
Indicatestheportisoperating
at 10 Mbps.
LNK/ACT Green
Blinking
Indicates a valid physical link
on the port.
Indicates data is being
transmitted or received on
the port.
FDX Green
OFF
Indicatestheportisoperating
in full-duplex mode.
Indicatestheportisoperating
in half-duplex mode.

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Power Supply
The AT-FS708LE Ethernet Switch uses an
external power adapter that comes standard
with the unit.
Store and Forward
The AT-FS708LE switch uses store and
forward as the method for receiving and
transmitting frames. When an 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.
Back Pressure and Flow Control
In order to maintain the orderly movement of
data between the end-nodes, an Ethernet
switch may periodically need to signal an end-
node to stop 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

AT-FS708LE Installation Guide
17
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
speed and duplex mode of the end-node and
switch port. A twisted pair port operating at
100 Mbps port and 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 end-nodes to stop sending
data. When the switch needs to stop a 100
Mbps, half-duplex end-node from transmitting
data, it forces a collision on the data link, which
stops the end-node. Once the switch is ready to
receive data again, the switch stops forcing
collisions. This is referred to as back pressure.
A port operating at 100 Mbps and 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. 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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The AT-FS708LE supports TX Flow Control
only. This means a PAUSE packet will be
transmitted to the end-node connection if it
receives data faster than it can switch the
packets. The AT-FS708LE does not support RX
Flow Control, however, and it will not respond
to PAUSE packets sent to it by an end-node.
Twisted Pair Ports
The AT-FS708LE switch has eight 10Base-T/
100Base-TX twisted pair ports. Each twisted
pair port features a RJ-45 connector. The
maximum operating distance for the twisted
pair ports is 100 meters (328 feet) when
operating at either 10 Mbps or 100 Mbps.
Port Speed
The twisted pair ports are compliant with the
10Base-T and 100Base-TX standards and are
capable of either 10 Mbps or 100 Mbps
operation. Since the ports are IEEE 802.3u
Auto-Negotiation compliant, the switch will set
the port speed automatically. With Auto-
Negotiation, the speed of a port is set
automatically by the switch after it determines
the speed of the end-node connected to the port.
Auto-negotiation is designed to ensure that the

AT-FS708LE Installation Guide
19
port on the switch and the end-node are
operating at the same speed and that they are
communicating at the highest possible common
speed of the devices.
Duplex Mode
Duplex mode refers to the way an end-node
sends and receives data on the network. An
end-node can operated in either half- or full-
duplex mode depending on its capabilities. An
end-node that is operating in half-duplex mode
can either send data or receive data, but it
cannot do both at the same time. An end-node
that is operating in full-duplex mode can send
and receive data simultaneously. The best
network performance is achieved when an end-
node can operate at full-duplex, since the end-
node is able to send and receive data
simultaneously.
The twisted pair ports on the AT-FS708LE
switch can operate in either half-duplex or full-
duplex mode. The switch sets the duplex mode
automatically through Auto-Negotiation. With
Auto-Negotiation, if an end-node is capable of
full-duplex, the port is set automatically to full-
duplex mode. If an end-node is capable of half-
duplex, the port is set automatically to half-
duplex mode.

20
Note
Since the AT-FS708LE ports operate in
Auto-Negotiate mode only, the end-nodes
connected to the AT-FS708LE 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
Auto-Negotiate protocol from the
AT-FS708LE. (The speed is determined
from the link pulses, however, so the
speed is always detected correctly.) As a
result, the AT-FS708LE port setting will
end up at half-duplex. If the end port is
manually configured to full-duplex, there
will be a duplex mismatch and data will
be lost. If the end port is manual
configured to half-duplex, both ports will
have the speed and duplex match up
correctly.
Auto MDI/MDI-X
An RJ-45 twisted pair port on a 10 Mbps or 100
Mbps Ethernet network device can have one of
two possible wiring configurations: MDI or
MDI-X. A RJ-45 port on a PC, router, or bridge
is typically wired as MDI, while a twisted pair
port on a switch or hubs is usually MDI-X.