Allied Telesis AT-FS905E User manual

AT-FS705E FC
AT-FS706E FC
10/100 Mbps Ethernet Switches
Installation Guide
PN 613-50221-00 Rev A

Copyright  2001 Allied Telesyn International, Corp.
960 Stewart Drive Suite B, Sunnyvale CA 94085, USA
All rights reserved. No part of this publication may be reproduced without prior written permission
from Allied 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 International, Corp. 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 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 manualor the information containedherein,
even ifAllied Telesyn International, Corp. has been advised of, known, or should have known, the
possibility of such damages.

iii
Electrical Safety and Emission Compliance
Statement
Standards: This product meets the following standards.
RFI Emission FCC Part 15 (Class A), EN55022 (Class A)
 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 UL1950 (UL/cUL), EN60950 (TUV), EN60825
 4
Important: Appendix A contains translated safety statements for installing this equipment. When yousee
the
 , go to Appendix A for the translated safety statement in your language.
Wichtig: AnhangA enthält übersetzte Sicherheitshinweisefür die Installation dieses Geräts.Wenn Sie

sehen, schlagen Sie in Anhang A den übersetzten Sicherheitshinweis in Ihrer Sprache nach.
Vigtigt: Tillæg A indeholder oversatte sikkerhedsadvarsler,der vedrører installation af dette udstyr. Når
De ser symbolet
 , skal Deslå opi tillæg Aog finde de oversatte sikkerhedsadvarsler i Deres eget sprog.
Belangrijk: Appendix Abevat vertaalde veiligheidsopmerkingen voor het installeren van dezeapparatuur.
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 àl'annexe A pour consulter la traduction de ces
instructions dans votre langue.
Tärkeää: Liite A sisältää tämänlaitteen asentamiseen liittyvät käännetyt turvaohjeet. Kun näet
 -
symbolin, katso käännettyäturvaohjetta liitteestäA.
Importante:l’AppendiceAcontieneavvisidisicurezzatradottiperl’installazionediquestaapparecchiatura.
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 TilleggA foråfinne den oversatte sikkerhetsinformasjonen påønsket 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.
U.S. Federal Communications Commission
RADIATED ENERGY
Note: This equipment has een 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
reasona le 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 e required to correct the interference at his own expense.
Note: Modifications or changes not expressly approved of y the manufacturer or the
FCC, can void your right to operate this equipment.
Industry Canada
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 rouilleur du Canada.

iv
Importante: El Apéndice A contiene mensajesde seguridad traducidosparala 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 gåtill Bilaga A för att läsa det översatta säkerhetsmeddelandet påditt språk.

v
Table of Contents
Electrical Safety and Emission Compliance Statement .......................iii
Welcome to Allied Telesyn .......................................................................... vii
Where to Find We - ased Guides ................................................................... vii
Document Conventions .................................................................................... vii
Contacting Allied Telesyn ...............................................................................viii
Online Support .........................................................................................viii
Telephone and Fax Support.....................................................................viii
E-mail Support ........................................................................................... ix
Returning Products ........................................................................................... ix
FTP Server.......................................................................................................... x
For Sales or Corporate Information .................................................................. x
Tell Us What You Think .................................................................................... x
Chapter 1
Overvie ........................................................................................................... 1
10/100 M ps Twisted Pair Ports........................................................................ 3
Type of Connector........................................................................................ 3
Speed............................................................................................................ 3
Duplex Mode ................................................................................................ 3
Ca ling......................................................................................................... 3
Maximum Distance ..................................................................................... 4
Auto MDI/MDI-X......................................................................................... 4
100 M ps Fi er Optic Port................................................................................. 5
Type of Connector........................................................................................ 5
Speed............................................................................................................ 5
Duplex Mode Switch.................................................................................... 5
Ca ling......................................................................................................... 5
Maximum Distance ..................................................................................... 6
Introduction to Ethernet Switching .................................................................. 7
MAC Address Ta le..................................................................................... 7
Store and Forward....................................................................................... 8
Flow Control and Backpresure................................................................... 8
Duplex Mode ................................................................................................ 9
System LEDs .................................................................................................... 10
Network Topologies .......................................................................................... 11

vi
Chapter 2
Installing the S itch .................................................................................... 17
Reviewing Safety Guidelines ........................................................................... 17
Verifying the Package Contents ...................................................................... 18
Selecting a Site for the Switch .........................................................................19
Installing the Twisted Pair and Fi er Optic Ca ling ..................................... 19
Installing the Switch On a Ta le or Desktop.................................................. 20
Installing the Switch on a Wall .......................................................................21
Verifying and Trou leshooting the Installation.............................................. 22
Warranty Registration ..................................................................................... 24
Technical Specifications ...................................................................................24
Appendix A
Translated Electrical Safety Emission Information............................. 27
Appendix B
Technical Support Fax Order .................................................................... 37
Incident Summary ............................................................................................37
Appendix C
AT-FS705E FC and AT-FS706E FC Installation Guide Feedback ......39

vii
The guide contains instructions on how to install the AT-FS705E FC Series
and AT-FS706E FC Series Ethernet Switches.
Where to Find Web-based Guides
The Allied Telesyn we site at .alliedtelesyn.com contains the most
recent documentation for all of our products. All product guides can e
downloaded from the we site in PDF format.
Document Conventions
This guide uses several conventions that you should ecome familiar with
efore you egin to install the product.
Note
A note provides additional information.
Caution
A caution indicates that performing or omitting a specific action may
result in equipment damage or loss of data.
Warning
A warning indicates that performing or omitting a specific action may
result in odily injury.
Welcome to Allied Telesyn

viii
Contacting Allied Telesyn
You can contact Allied Telesyn technical support y telephone, fax, or e-mail.
You can also contact technical support online through our we site.
Online Support
You can request technical support online y filling out the Online Technical
Support Form at .alliedtelesyn.com/support/supportf.asp or y
accessing the Technical Support Knowledge Base from the Allied Telesyn
North American we site. The Knowledge Base allows you to su mit questions
to our technical staff and review answers to previously asked questions.
Telephone and Fax Support
Listed elow are the telephone and fax num ers for contacting Allied Telesyn
Technical Support. On page 37 of this manual is the Technical Support Fax
Order form. You should fill out this form and fax it to the appropriate num er
elow when requesting technical assistance.
Americas
United States, Canada, Mexico,
Central America, South America
Tel: [phone], option 4
Fax: [phone]
Germany
Germany, Switzerland, Austria, Eastern
Europe
Tel: [phone]
Fax: [phone]
Asia
Singapore, Taiwan, Thailand, Malaysia,
Indonesia, Korea, Philippines, China,
India, Hong Kong
Tel: [phone]
Fax: [phone]
Italy
Italy, Spain, Portugal, Greece, Turkey,
Israel
Tel: [phone]
Fax: [phone]
Australia
Australia, New Zealand
Tel: [phone]
Fax: [phone]
Japan
Tel: [phone]
Fax: [phone]
France
France, Belgium, Luxem ourg,
The Netherlands, Middle East, Africa
Tel: [phone]
Fax: [phone]
United Kingdom
United Kingdom, Denmark, Norway,
Sweden, Finland, Iceland
Tel: [phone]
Fax: [phone]

AT-FH705E FC and AT-FS706E FC Installation Guide
ix
E-mail Support
United States and Canada
[e-mail]
Latin America, Mexico, Puerto Rico, Caribbean, and Virgin Islands
[e-mail]
Returning Products
Products for return or repair must first e assigned a Return Materials
Authorization (RMA) num er. A product sent to Allied Telesyn without a
RMA num er will e returned to the sender at the sender’s expense.
To o tain an RMA num er, contact Allied Telesyn’s Technical Support at one
of the following locations:
❑United States and Canada
Toll-free: 1-800-428-4835, option 4
Fax: [phone]
❑Europe, Africa, and Middle East
Tel: [phone]
Fax: [phone]
❑Latin America, Caribbean, and Virgin Islands
Tel: International code + 425-481-3852
Fax: International code + 425-481-3895
❑Puerto Rico
Tel: [phone], ext. 3852 or
Tel: [phone], ext. 3852
❑Mexico
Tel: [phone], ext. 3852
Fax: International code + 425-481-3895
❑Asia and Southeast Asia
Tel: [phone]
Fax: [phone]
❑Australia
Tel: [phone]
Fax: [phone]
❑Ne Zealand
Tel: [phone]

x
FTP Server
If you need a new version of management software for an Allied Telesyn
managed device and you know the file name of the program, you can download
the software y connecting directly to our FTP server at ftp://
gate ay.centre.com. At login, enter ‘anonymous’ as the username and your
e-mail address as the password.
For Sales or Corporate Information
Tell Us What You Think
If you have any comments or suggestions on how we might improve this or
other Allied Telesyn documents, fill out the “AT-FS705E FC and AT-FS706E
FC Installation Guide Feed ack” on page 39 and return the form to us at the
address or fax num er provided. You can also provide feed ack online y
filling out the Send Us Feed ack form at .alliedtelesyn.com/contact/
feedbackf.asp.
Allied Telesyn International, Corp.
19800 North Creek Parkway, Suite 200
Bothell, WA 98011
Tel: [phone]
Fax: [phone]
Allied Telesyn International, Corp.
960 Stewart Drive, Suite B
Sunnyvale, CA 94085
Tel: [phone] (USA and Canada)
Fax: [phone]

1
Chapter 1
Overview
The AT-FS705E FC Series and the AT-FS706E FC Series Fast Ethernet
switches are unmanaged Layer 2 switches. They can e used in a variety of
network configurations and topologies. You can use the switches to create
small workgroups with dedicated 10/100 M ps links to your network devices,
such as workstations, servers, printers, and routers. You can also use the
switches to interconnect Ethernet hu s to provide a ridge etween the
different workgroups of your network. Finally, you can connect the switches to
other Ethernet switches so that they can e part of a larger Ethernet network.
Common features of the switches include:
G Four 10/100 M ps (10Base-T / 100Base-TX) twisted pair ports with
RJ-45 connectors
G One (AT-FS705E FC) or two (AT-FS706E FC) 100 M ps fi er optic
ports with a maximum operating distance of 2 kilometers (1.25 miles)
G Full- or half-duplex operation on oth the twisted pair ports and the
fi er optic ports
G Automatic MDI/MDI-X configuration on the twisted pair ports
G Store and forward Ethernet packet handling
G MAC address ta le with a capacity of 4,000 addresses
The AT-FS705E FC Series and the AT-FS706E FC Series Fast Ethernet
switches are easy to operate. They require no software management.
The switches are availa le with a variety of fi er optic connectors. For a
complete list of the availa le models, contact your Allied Telesyn
International sales representative.
Note
The AT-FS705E FC Series and the AT-FS706E FC Series switches are
functionally identical. The only difference is the addition of the second
fi er optic port on the AT-FS706E FC Series switch.

2
Figure 1 and Figure 2 illustrate the front and rear panels of the AT-FS705E
FC Series and AT-FS706E FC Series Ethernet switches, respectively.
Figure 1 Front and Rear Panels of the AT-FS705EFC (Model AT-FS705EFC/SC)
Figure 2 Front and Rear Panels of the AT-FS706EFC (Model AT-FS706E FC/SC)
10Base-T/100Base-TX Ports 100Base-FX
Fiber Optic Port DC Power
Connector
Power
LED
Twisted Pair
Port LEDs
Fiber Optic
Port LEDS
Duplex Mode Switch
Fiber Optic Port
LNK/ACT
1
23
4
5 PWR
10BASE-T / 100BASE-TX 4 PORT ETHERNET SWITCH WITH 100FX UPLINK
100M
LNK/ACT
FD
100FX 10/100TX
5
100FX
DUPLEX
HALF
FULL
AT-FS705E Telesyn
Allied FC/SC
1 2
3 4
RXTX
5
DC In
3.3V
LNK/ACTY
1
23
4
5 PWR
10BASE-T / 100BASE-TX 4 PORT ETHERNET SWITCH WITH 100FX UPLINKS
100M
LNK/ACTY
FD
100FX 10/100TX
1 2
3 4
RXTX
5
DC In
3.3V
AT-FS706E Telesyn
Allied FC/SC
RXTX
6
6
5
HALF
FULL 6
100FX
DUPLEX
10Base-T/100Base-TX Ports Fiber Optic Ports Connector
DC Power
100Base-FX
LED
Port LEDs
Port LEDS
Duplex Mode Switches Power
Twisted Pair
Fiber Optic
Fiber Optic Port

AT-FS705E FC and AT-FS706E FC Installation Guide
3
10/100 Mbps Twisted Pair Ports
The AT-FS705E FC and AT-FS706E FC switches have four twisted pair ports.
Type of Connector
The twisted pair ports have RJ45 connectors.
Speed
These ports are compliant with the 10Base-T and 100Base-TX standards and
are capa le of either 10 M ps or 100 M ps operation. The ports are IEEE
802.3u Auto-negotiation-compliant, meaning the speed for each port is set
automatically y the switch after determining the speed of the end node
connected to the port. Auto-negotiation is designed to ensure that each port on
the switch and the end node connected to each port are operating at the same
speed and that they are communicating at the highest possi le common speed
of the devices.
Duplex Mode
The twisted pair ports can operate in either half- or full-duplex operation. Just
as with speed, the ports use Auto-negotiation to set the duplex mode. If the
end node is capa le of full-duplex mode, the port is set to full-duplex. If the
end node is capa le of only half-duplex, the port is set to half-duplex. For an
explanation of duplex mode, refer to the section “Duplex Mode” on page 9.
Cabling
The RJ45 ports on the switch can use shielded or unshielded twisted pair
ca le. There are several categories of twisted pair ca ling used in Ethernet
networks. They are Category 3, 4, and 5. The main difference etween the
categories relates to their attenuation, which is a measurement of signal loss
over the length of the ca le. All ca les experience attenuation. The signal
loses strength the longer the ca le. The lower the loss of signal, the lower the
attenuation.
Of the three categories, Category 3 has the highest attenuation, meaning that
it has the highest signal loss. It is adequate for 10 M ps operation, ut should
never e used for 100 M ps network operations. The higher speed requires
Category 5. If you are installing a new network with end nodes operating at 10
M ps, it is recommended that you install Category 5 instead of Category 3.
This will save you the trou le of having to install new twisted pair ca ling
should you later upgrade your end nodes to 100 M ps.

4
Maximum Distance
The maximum distance of a twisted pair ca le is 100 meters (328 feet). Ca le
lengths that exceed this limit can result in poor or erratic network
performance.
Auto MDI/MDI-X
An RJ45 twisted pair port on a 10 M ps or 100 M ps Ethernet network device
can e wired as either MDI and MDI-X. Twisted pair ports on personal
computers, routers, and ridges are typically wired as MDI. The twisted pair
ports on switches and hu s are usually MDI-X.
When connecting two network devices together, you use straight-through
twisted pair ca ling when connecting two dissimilar ports together, such as an
MDI port to an MDI-X port. To connect two similar ports together, such as an
MDI port to an MDI port, you use a crossover twisted pair ca le.
The twisted pair ports on the AT-FS705E FC and AT-FS706E FC can operate
as either MDI or MDI-X. This feature eliminates the need for using a
crossover ca le with the switch. This means that you can use straight-through
twisted pair ca ling regardless of the type of end nodes you connect to the
ports. Each port automatically determines the configuration of the port on the
device to which it is connected and then configures itself appropriately. For
example, if a port on a switch is connected to a port on a ridge, which is
typically wired as MDI, the port on the switch automatically configures itself
as MDI-X.

AT-FS705E FC and AT-FS706E FC Installation Guide
5
100 Mbps Fiber Optic Port
The AT-FS705E FC and AT-FS706E FC Ethernet switches feature one and
two fi er optic ports, respectively. You can use the fi er optic ports to connect
the switch to other switches or other end nodes over large distances.
Type of Connector
The AT-FS705E FC Series and the AT-FS706E FC Series switches come with
a variety of fi er optic connectors. Contact your Allied Telesyn International
sales representative for a list of availa le connector types.
Speed
The fi er optic port is complaint with the 100Base-FX standard and has a
fixed operating speed of 100 M ps. This speed cannot e changed; the end
node that you connect to the fi er optic port on the switch must also e a le to
operate at 100 M ps.
Duplex Mode Switch
The fi er optic port(s) is a le to operate in either half- or full-duplex mode.
The duplex mode is set with the 100FX DUPLEX switch located on the front of
the switch. The AT-FS705E FC Series has one duplex switch for its one fi er
optic port. The AT-FS706E FC Series has two duplex switches, one for each of
its two fi er optic ports. For an explanation of duplex mode, “Duplex Mode” on
page 9.
Cabling
There are two asic types of fi er optic ca ling used in Ethernet networks:
multimode fi er and single-mode fi er. Multimode fi er is for short distances,
typically not more than 2 kilometers (1.25 miles). Single-mode is for longer
distances. The fi er optic port(s) on the Ethernet switch has a maximum
operating distance of 2 kilometers, and is designed to e used with either
54/125 or 60/125 micron core/cladding multimode ca le.
Note
Do not use single-mode fi er optic ca le with the fi er optic port(s) on
the AT-FS705E FC and AT-FS706E FC Ethernet switches.

6
Maximum Distance
The maximum operating distance of the fi er optic ports on the AT-FS705E
FC and AT-FS706E FC Ethernet switches is 2 kilometers (1.25 miles). Ca le
lengths that exceed this limit can result in poor or erratic network
performance.
Note
The fi er optic port on the network device that you intend to connect to
the AT-FS705E FC or AT-FS706E FC Ethernet switch must have the
same operating characteristics as the fi er optic port on the switch. For
example, the maximum operating distance and operating wavelength of
the end node’s fi er optic port should e the same as the switch’s fi er
optic port. For the technical specifications of the fi er optic port on the
switch, refer to “Technical Specifications” on page 24.

AT-FS705E FC and AT-FS706E FC Installation Guide
7
Introduction to Ethernet Switching
An Ethernet switch is designed to manage the flow of data etween the
various devices that are connected to its ports.
MAC Address Table
The heart of an Ethernet switch is the Media Access Control (MAC) address
ta le. Every device that you attach to an Ethernet network has a MAC
address. This address is assigned to the device y the device’s manufacturer.
For example, each network interface card (NIC) that you install into your
network computers has a MAC address that was assigned to it y the card’s
manufacturer.
A switch’s MAC address ta le is a list of the MAC addresses of the devices
that are connected to its ports. The switch uses this ta le to direct data frames
to their appropriate destination end nodes, and in some cases, to discard
frames that it receives. The switch creates the MAC address ta le y
examining the frames that it receives on its ports. Each frame is examined for
its source address; that is, the MAC address of the end node that sent the
frame. The switch checks to determine whether the address is already in its
MAC address ta le. If it is not, the switch adds the address to the ta le along
with the port num er on which the frame was received. The result is a ta le
that contains a list of all the MAC addresses of end nodes that have sent
frames to the switch and the ports on the switch to which the end nodes are
connected.
The switch also checks the destination MAC address of each frame it receives.
The destination address is the MAC address of the end node to which the
frame is intended. If the address is in the ta le, the switch directs the frame
directly to the port where the end node is located. This helps to ensure that
end nodes will only receive traffic that is intended for them and not have to
deal with traffic intended for other end nodes.
If the destination address is not in the MAC address ta le, the switch
roadcasts the frame to all switch ports. When the destination node responds,
the switch will e a le to match the address to a port so that the next time a
frame is destined to that particular end node, the switch will e a le to
forward the frame to the correct port instead of having to roadcast the frame
to all ports.
In some cases a switch will even discard a frame. If the switch receives a
frame that is destined to a node on the same port on which the frame was
received, the switch discards the frame.

8
The MAC address ta le in the AT-FS705E FC Series and AT-FS706E FC
Series switches can store up to 4,000 MAC addresses. To prevent the ta le
from ecoming filled with addresses of end nodes that are no longer active, the
switch has a MAC address aging timer. This timer will delete a MAC address
from the ta le if it does not see a frame from the end node with the address on
any port after five minutes (300 seconds). The aging timer also helps to ensure
that the ta le is correct should an end node e moved from one port on the
switch to another port.
Store and Forward
The Ethernet switch uses 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 its memory uffer. It then
examines the frame to determine if it is a valid frame. Invalid frames, such as
fragments, are discarded y the switch. In this manner, the switch ensures
that only valid frames are transmitted out its ports and that damaged frames
are not propagated on your network.
Flow Control and Backpresure
In order for an Ethernet switch to maintain the orderly movement of data
etween the end nodes that are connected to its ports, it will occasionally need
to signal an end node to stop sending data. This can occur under several
situations. For example, when two end nodes are operating at different
speeds, the switch, while transferring data etween the 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 situation would e when a server
operating at 100 M ps is sending data to a workstation operating at only 10
M ps.
Another situation when a switch might need to stop the transmission of data
from an end node is if two end nodes are vying for the same switch port at the
same time. An example of this would e if two workstations were attempting
to send data to the same network printer simultaneously. The switch could
allow only one workstation to send out the port to the printer, and it would
need to instruct the other workstation to delay data transmission.
To some degree, these conflicts are avoided y the switch’s port uffers. These
uffers are used to store data when a port is either already usy transmitting
other data or when a transmitting port on a switch is operating at a slower
speed than the port on the switch receiving data.

AT-FS705E FC and AT-FS706E FC Installation Guide
9
How a switch signals an end node to stop transmitting data differs depending
on the speed of the end node and switch port. Ports operating at 10 M ps use
flow control while ports operating at 100 M ps use ackpressure.
For a 10 M ps port, the switch will stop an end node from transmitting data
y forcing a collision. A collision on an Ethernet network occurs when two
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 10 M ps 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.
A port running at 100 M ps uses PAUSE frames, as specified in the IEEE
802.3x standard. Whenever the switch wants an end node running at 100
M ps to stop transmitting data, it issues a PAUSE frame. The frame simply
instructs the end node to cease transmission. The switch continues to issue
PAUSE frames until it is ready to again receive data from the end node.
Duplex Mode
Duplex mode refers to the manner in which an end node handles the receiving
and transmitting of data. If an end node can receive or transmit data, ut not
oth at the same time, the end node is operating in what is referred to as half-
duplex mode. If an end node can oth receive and transmit data
simultaneously, the node is operating in full-duplex mode. Naturally, a node
capa le of operating in full-duplex can handle data much faster than a node
that can only operate in half-duplex.
Each port on an AT-FS705E FC Series switch and AT-FS706E FC Series
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.
If the end node connected to a twisted pair port on the switch is capa le of full-
duplex operation, the switch sets the twisted pair port to full-duplex. If the
end node is capa le of only half-duplex, the port is set automatically to half-
duplex.
The duplex mode for the fi er optic port(s) must e set manually using the
100FX DUPLEX switch on the front panel of the switch. For the fi er optic
port to function correctly, this switch must e set to correspond to the duplex
mode capa ility of the end node connected to port.

10
System LEDs
The switch has a series of LEDs that you can use to determine the operating
status of the system and the ports. The LEDs are descri ed in Ta le 1.
Table 1 System and Port LEDs
LED Color Function
PWR Steady Green The switch is receiving power.
FD Steady Green The fiber optic port is operating in full-duplex
mode.
OFF The fiber optic port is operating in half-duplex
mode.
100M Steady Green The twisted pair port is operating at 100 Mbps.
OFF The twisted pair port is operating at 10 Mbps.
LNK/ACTY Steady Green The port has established a valid link with the
end node connected to the port.
Blinking Green Activity is detected on the port.
OFF The porthas not established alink withthe end
node.