Allied Telesis AT-FS238 AT-FS238a/1 User manual

AT-FS238a/1
AT-FS238b/1
AT-FS238a/2
AT-FS238b/2
Bridging Converters
Installation Guide
PN 613-50431-00 Rev A

Copyright 2003 Allied Telesyn, Inc.
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, Inc.
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 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.

iii
Electrical Safety and Emission Compliance
Statement
Standards: This product meets the following standards.
U.S. Federal Communications Commission
Declaration Of Conformity
Manufacturer Name: Allied Telesyn, Inc.
Manufacturer Address: 960 Stewart Drive, Suite B
Sunnyvale, CA 94085, USA
Manufacturer Telephone: [phone]
Declares that the product: Bridging Converter
Model Numbers: AT-FS238a/1, AT-FS238b/1,
AT-FS238a/2, AT-FS238b/2
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.

Electrical Safety and Emission Compliance Statement
iv
RFI Emission EN55022 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
Warning: This product requires shielded cables to comply with emission
and immunity standards. If it is used with unshielded cables, the user may
be required to take measures to correct the interference problem at their own
expense.
 4
Electrical Safety EN60950, UL60950
 5
Laser EN60825
 6
Warning Class 1 Laser product.
 7
Warning Do not stare into the Laser beam.
 8
At time of installation, the Fiber Optic Lasers comply with FDA Radiation
Performance Standard 21CFR Subchapter J, applicable at date of
manufacture.
This is a “Class 1 LED Product” (AT-FS201, AT-FS202 models)
 9
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.
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 B 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.

AT-FS238a/x and AT-FS238b/x Series Installation Guide
v
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.

vii
Table of Contents
Electrical Safety and Emission Compliance Statement ......................iii
Welcome to Allied Telesyn .......................................................................... ix
Where to Find Web-based Guides ................................................................... ix
Document Conventions .................................................................................... ix
Contacting Allied Telesyn Technical Support .................................................. x
Online Support ........................................................................................... x
Telephone Support ..................................................................................... x
Technical Support E-mail Addresses ........................................................ x
Returning Products .......................................................................................... xi
For Sales or Corporate Information ................................................................ xi
Tell Us What You Think .................................................................................. xi
Chapter 1
Overview .......................................................................................................... 1
External Power Supply .............................................................................. 4
Key Features ...................................................................................................... 5
Status LEDs ....................................................................................................... 6
Twisted Pair Port ............................................................................................... 7
Port Speed ................................................................................................... 7
Duplex Mode ............................................................................................... 7
Auto MDI/MDI-X ........................................................................................ 8
Fiber Optic Port ................................................................................................. 8
Port Speed ................................................................................................... 8
Duplex Mode ............................................................................................... 9
Mode Selection Button ...................................................................................... 9
Link Test ..................................................................................................... 9
MissingLink ................................................................................................ 9
Smart MissingLink .................................................................................. 10
Bridging Converter Performance .................................................................... 10
DIP Switches ............................................................................................ 11
MAC Address Table .................................................................................. 11
Store and Forward .................................................................................... 11
Network Topologies ......................................................................................... 12

Table of Contents
viii
Chapter 2
Installing the Bridging Converter ........................................................... 13
Verifying Package Contents ............................................................................ 13
Planning the Installation ................................................................................ 14
Selecting a Site ......................................................................................... 15
Installing the Bridging Converter ..................................................................16
Connecting a 12VDC Powered Unit ........................................................18
Wiring and Connecting a 12-50VDC Powered Unit ............................... 19
Warranty Registration .................................................................................... 23
Chapter 3
Troubleshooting ........................................................................................... 25
Appendix A
Technical Specifications ............................................................................27
Physical ............................................................................................................27
Environmental ................................................................................................. 27
Electrical Rating .............................................................................................. 27
Agency Certifications ....................................................................................... 28
Fiber Optic Port Specifications .......................................................................29
RJ-45 Pinout Assignments ..............................................................................30
Appendix B
Translated Safety and Emission Information .......................................33

ix
This guide contains instructions on how to install the AT-FS238a/x and
AT-FS238b/x Series Bridging Converters.
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 provides additional information.
Caution
Cautions indicate that performing or omitting a specific action may
result in equipment damage or loss of data.
Warning
Warnings indicates that performing or omitting a specific action may
result in bodily injury.
Welcome to Allied Telesyn

Welcome to Allied Telesyn
x
Contacting Allied Telesyn Technical Support
You can contact Allied Telesyn technical support online or by telephone, or
e-mail.
Online Support
You can request technical support online by accessing the Knowledge Base at
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.
Telephone Support
For Technical Support by telephone, contact Allied Telesyn at one of the
following locations:
Technical Support E-mail Addresses
Latin America, Mexico, Puerto Rico, Caribbean, and Virgin Islands
[e-mail]
United Kingdom, Sweden, Norway, Denmark, and Finland
[e-mail]
Americas
United States, Canada, Mexico,
Central America, South America
Tel: [phone]
Germany
Switzerland, Austria, Eastern Europe
Tel: [phone]
Asia
Singapore, Taiwan, Thailand,
Malaysia, Indonesia, Korea,
Philippines, China, India, Hong Kong
Tel: [phone]
Italy
Spain, Portugal, Greece, Turkey, Israel
Tel: [phone]
Australia
Tel: [phone]
Japan
Tel: [phone]
France
Belgium, Luxembourg, The
Netherlands, Middle East, Africa
Tel: [phone]
United Kingdom
Denmark, Norway, Sweden, Finland,
Iceland
Tel: [phone]

AT-FS238a/x and AT-FS238b/x Series Installation Guide
xi
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 an RMA number, contact Allied Telesyn’s Technical Support at one
of the following locations:
For Sales or Corporate Information
You can contact Allied Telesyn for sales or corporate information at the
location below:
Allied Teleyn, Inc.
19800 North Creek Parkway, Suite 200
Bothell, WA 98011
Tel: [phone]
Fax: [phone]
Tell Us What You Think
If you have any comments or suggestions on how we might improve this or
other Allied Telesyn documents, please fill out the General Enquiry Form
online. This form can be accessed by selecting “Contact Us” from
www.alliedtelesyn.com.
North America
Toll-free: 1-800-762-1664
Fax: [phone]
Europe, Africa, and the Middle
East
Tel: [phone]
Fax: [phone]
Latin America, the Caribbean,
Virgin Islands
Tel: international code + 425-481-3852
Fax: international code + 425-481-3895
Asia and Southeast Asia
Tel: [phone]
Fax: [phone]
Mexico
Toll-free: 1-800-424-5012, ext 3852
Fax: international code + 425-481-3895
Puerto Rico
Toll-free: 1-800-424-5012, ext 3852
or 1-800-424-4284, ext 3852
Australia
Toll-free: 1-800-000-880
Fax: + 61-2-9438-4966
New Zealand
Toll-free: 0800-45-5782
Fax: [phone]

1
Chapter 1
Overview
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters are the
10/100Mbps fast switch single-mode fiber transceivers which can send and
receive on two different wavelengths (1310nm and 1550nm) on a single-mode
fiber cable.
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters include the
following models:
Below is how to differentiate between the models mentioned above:
❑AT-FS238a/1 = (1310TX/1550RX) - 15 km range
❑AT-FS238b/1 = (1550TX/1310RX) - 15 km range
❑AT-FS238a/2 = (1310TX/1550RX) - 40 km range
❑AT-FS238b/2 = (1550TX/1310RX) - 40 km range
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters are designed
to extend the distance of your network by converting Fast Ethernet data
between twisted pair cabling and single-mode fiber optic cabling. These dual-
port bridging converters can also be used to improve the performance of your
network by dividing it into smaller, more manageable segments.
Each bridging converter features a 100Base-FX fiber optic port and a 10Base-
T/100Base-TX twisted pair port.The fiber optic port has a simplex SC
(Subscriber Connector) connector and an operating distance of 15 kilometers
(9.4 miles) or 40 kilometers (24.8 miles), depending on the model. The twisted
pair port has an RJ-45 connector with a maximum operating distance of 100
meters (328 feet).
❑AT-FS238a/1 ❑AT-FS238b/1
❑AT-FS238a/2 ❑AT-FS238b/2

Overview
2
The fiber optic port operates at 100 Mbps, while the twisted pair port operates
at 10 Mbps or 100 Mbps. Both ports feature half- and full-duplex operation.
AT-FS238a/x and AT-FS238b/x Series Bridging Converters can be installed on
a desktop or in an AT-MCR12 chassis. These bridging converters are easy to
install and do not require software configuration or management.
Note
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters are
designed to be used in pairs; therefore, the AT-FS238a/x fiber port must
be connected to the AT-FS238b/x fiber port only.
Figure 1 illustrates the front panel of the AT-FS238a/x Series Bridging
Converter.
Figure 1 AT-FS238a/x Series Front Panel (AT-FS238a/1 Model)
Figure 2 illustrates the front panel of the AT-FS238b/x Series Bridging
Converter.
Figure 2 AT-FS238b/x Series Front Panel (AT-FS238b/1 Model)

AT-FS238a/x and AT-FS238b/x Series Installation Guide
3
The back panel of the AT-FS238a/x and AT-FS238b/x Series Bridging
Converters features a receptacle power connector and DIP switches for
manually configuring the ports.
Note
The AT-FS238a/x and AT-FS238b/x Bridging Converters are designed
with 2 different receptacle connectors: 12VDC only or 12-50VDC version
models.
Figure 3 illustrates the back panel of the AT-FS238a/x or the AT-FS238b/x
Series Bridging Converters with 3-prong receptacle connector for the
12VDC version model.
Figure 3 Back Panel of the AT-FS238a/x and AT-FS238b/x Series Bridging Converters
(12VDC Receptacle Connector)
Figure 4 illustrates the back panel of the AT-FS238a/x and the AT-FS238b/x
Series Bridging Converters with the 3-prong receptacle connector for the
12-50VDC version model.
Figure 4 Back Panel of the AT-FS238a/x and AT-FS238b/x Series Bridging Converters
(12-50VDC 3-Prong Receptacle Connector)
DIP Switches
12VDC Receptacle Connector DC Polarity Symbols
DIP Switches
12-50VDC 3-Prong Receptacle Connector DC Polarity Symbols

Overview
4
Table 1 lists the maximum operating distances for the bridging converters.
Table 1 Maximum Operating Distances
External Power Supply
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters are designed
with either the 12VDC or the 12-50VDC receptacle power connector.
Any of the following power sources can be used with the AT-FS238a/x or
AT-FS238b/x Series Bridging converter.
❑An AC/DC power adapter - used specifically with the 12VDC-rated
version model
❑An AT-PWR237 power adapter (12V or 15V output) - used with the
12-50VDC-rated version model. This power adapter must be used with
the power connector provided, shown in Figure 5 on page 5.
❑A regulated power supply (SELV power source per IEC 60950) - rated
minimum 12-50VDC 0.5A - used specifically with the 12-50VDC-rated
version model. This power supply must be used with the power
connector provided, shown in Figure 5 on page 5.
Note
Use only power sources that are UL Listed (QQGQ or EPBU), TUV
Licensed, or other Safety Agencies approved, suitable for country of use.
Model
100Base-FX 10Base-T/100Base-TX
Connector Maximum Operating
Distance1
1. Maximum distance for 100 Mbps optical datalinks is dependent on the following factors: type of optical fiber,
duplex mode of both end-nodes, and maximum optical loss budget for each of the optical fiber at the operating
optical wavelength.
Connector Maximum Operating
Distance2
2. Maximum distance can only be obtained when the UTP/STP cabling is installed and verified to TIA/EIA 568A
Commercial Building Telecommunications Cabling Standard.
AT-FS238a/1
AT-FS238b/1
SC 15 km (9.3 mi) RJ-45 100 m (328 ft)
AT-FS238a/2
AT-FS238b/2
SC 40 km (24.8 mi) RJ-45 100 m (328 ft)

AT-FS238a/x and AT-FS238b/x Series Installation Guide
5
Figure 5 illustrates the power connector provided with the unit.
Figure 5 Power Connector for the 12-50VDC Version Converter
Key Features
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters have the
following features:
❑LEDs for unit and port status
❑Auto MDI/MDI-X
❑Mode selection button that toggles between Link Test, MissingLink  ,
and Smart MissingLink
❑DIP switches for configuring the ports
❑Half- or full-duplex operation on both ports
❑RJ-45 twisted pair connector
❑SC fiber optic connector
❑Data packet forwarding and filtering at full wire speed (10 Mbps to
100 Mbps, and 100 Mbps to 100 Mbps)
❑Store and forward switching mode
❑Automatic address learning and aging
❑IEEE 802.3u compliant auto-negotiation
❑External power adapter (depending on the model)
❑For use on a desktop or in an AT-MCR12 chassis

Overview
6
Status LEDs
Table 2 defines the LEDs for the bridging converters.
Table 2 Status LEDs
LED Color Description
PWR Green Power is applied to the unit.
AUTO NEG Green
OFF
Auto-negotiation on the twisted pair port is enabled.
Auto-negotiation on the twisted pair port is disabled.
100M Green
OFF
The twisted pair port is operating at 100 Mbps.
The twisted pair port is operating at 10 Mbps.
LNK Green
Blinking
A valid link has been established on the port.
Data is being received or transmitted on the port.
FD/COL Green
OFF
Blinking
The bridging converter is operating in full-duplex mode.
The bridging converter is operating in half-duplex mode.
A collision has been detected on the port.
Mode Status
ML Green MissingLink is enabled.
SML Green Smart MissingLink is enabled.
LT Green Link Test is enabled.

AT-FS238a/x and AT-FS238b/x Series Installation Guide
7
Twisted Pair Port
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters have one
10Base-T/100Base-TX twisted pair port. The twisted pair port features a
RJ-45 connector.
Port Speed
The twisted pair port is compliant with the 10Base-T and 100Base-TX
standards and is capable of either 10 Mbps or 100 Mbps operation. You can set
the port speed manually or, since the port is IEEE 802.3u auto-negotiation
compliant, you can allow the bridging converter to set the port speed
automatically. With auto-negotiation, the speed of the port is set
automatically by the bridging converter after it determines the speed of the
end-node connected to the port. Auto-negotiation is designed to ensure that
the port on the bridging converter 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 how an end-node receives and transmits data. If an
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-FS238a/x and AT-FS238b/x Series Bridging
Converter 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 bridging converter, the end-
nodes connected to the converter 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 converter
port. A port on the bridging converter 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 half-duplex. 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.

Overview
8
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. The
RJ-45 port on a PC, router, or bridge is typically wired as MDI, while the
twisted pair port on a bridging converter or hub is usually MDI-X.
To connect two 10 Mbps or 100 Mbps network devices together that have
dissimilar port wiring configurations, such as MDI to MDI-X, you would
usually use a straight-through twisted pair cable. To connect two network
devices that have the same wiring configuration, such as MDI to MDI, you
would usually use a crossover cable.
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters feature
automatic MDI/MDI-X. The RJ-45 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 bridging converter
is connected to a port on a bridge, which is typically wired as MDI, the port on
the bridging converter automatically configures itself as MDI-X. This feature
allows you to use either crossover cables or straight-through cable when
connecting a device to the twisted pair port.
Fiber Optic Port
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters have one
100Base-FX fiber optic port. The single-mode fiber optic port features a
simplex SC connector.
Port Speed
The fiber optic port is compliant with the 100Base-FX standard and has a
fixed operating speed of 100 Mbps. The end-node connected to the fiber optic
port on the bridging converter must also be able to operate at 100 Mbps. The
AT-FS238a/x and AT-FS238b/x Series Bridging Converters can send and
receive on the two different wavelengths (1310nm and 1550nm). The different
wavelengths used by these bridging converters are as follow:
❑AT-FS238a/x - TX=1310 and RX=1550
❑AT-FS238b/x - TX=1550 and RX=1310
Note
The AT-FS238a/x and AT-FS238b/x Series Bridging Converters are
designed to be used in pairs; therefore, the AT-FS238a/x fiber must be
connected to the AT-FS238b/x fiber only.