Allied Telesis AT-FS201 Series User manual

AT-FS201
AT-FS202
AT-FS202SC/FS1
AT-FS202SC/FS2
AT-FS202SC/FS3
AT-FS202SC/FS4
Fast Ethernet Switches
Installation Guide
PN 613-10761-00 Rev C

Copyright 2001 Allied Telesyn International Corp.
960 Stewart Drive, Suite B, Sunnyvale CA 94086 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 manual or the information contained herein, even if Allied Telesyn
International Corp. has been advised of, known, or should have known, the possibility of
such damages.

iii
Safety Warnings
Standards: This product meets the following standards.
RFI Emission 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
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, UL1950, CSA 950 $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.
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 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 of by 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 brouilleur du Canada.

Safety Warnings
iv
Important: L'annexe B contient les instructions de sécuritérelatives àl'installation de cet
équipement. Lorsque vous voyez le symbole $, reportez-vous àl'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 käännettyäturvaohjetta liitteestäB.
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 åfinne den oversatte
sikkerhetsinformasjonen påønsket 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 gåtill Bilaga B för att läsa det översatta
säkerhetsmeddelandet påditt språk.

v
Table of Contents
Safety Warnings ............................................................................................iii
Welcome to Allied Telesyn .........................................................................vii
Where to Find Web-based Guides ...................................................................vii
Document Conventions ....................................................................................vii
Contacting Allied Telesyn Technical Support................................................viii
Online Support .........................................................................................viii
Telephone and Fax Support.....................................................................viii
Technical Support E-mail Addresses ........................................................ ix
Returning Products ........................................................................................... ix
FTP Server......................................................................................................... ix
For Sales or Corporate Information .................................................................. x
Tell Us What You Think .................................................................................... x
Chapter 1
Description ...................................................................................................... 1
Features .............................................................................................................. 3
Status LEDs ................................................................................................ 4
External AC/DC Power Adapter................................................................. 4
Twisted Pair Port................................................................................................ 5
Port Speed.................................................................................................... 5
Duplex Mode................................................................................................ 5
Auto MDI/MDI-X......................................................................................... 5
Fiber Optic Port.................................................................................................. 6
Port Speed.................................................................................................... 6
Duplex Mode................................................................................................ 6
Switch Performance............................................................................................ 6
DIP Switches ............................................................................................... 7
MAC Address Table..................................................................................... 7
Store and Forward....................................................................................... 7
Network Topologies ............................................................................................ 8
Chapter 2
Installing the Switch ..................................................................................... 9
Verifying the Package Contents ........................................................................ 9
Planning the Installation................................................................................. 10
Selecting a Site ................................................................................................. 12
Installing the Switch ........................................................................................ 12
Warranty Registration ..................................................................................... 14

Table of Contents
vi
Chapter 3
Troubleshooting ...........................................................................................15
Appendix A
Technical Specifications ............................................................................17
Physical .............................................................................................................17
Temperature .....................................................................................................17
Electrical Rating ...............................................................................................17
Agency Certifications........................................................................................17
Transmitter.......................................................................................................18
Fiber Optic Port Specifications ........................................................................18
Pinout Assignments..........................................................................................20
Appendix B
Electrical Safety and Installation Requirements .................................21
Appendix C
Technical Support Fax Order ...................................................................31
Incident Summary ............................................................................................31

vii
This guide contains instructions on how to install the AT-FS20x and
AT-FS202SC/FSx Series Fast Ethernet Switches.
Where to Find Web-based Guides
The Allied Telesyn web site at www.alliedtelesyn.com provides you with 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 several conventions that you should become familiar with
before you begin 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 bodily injury.
Welcome to Allied Telesyn

Welcome to Allied Telesyn
viii
Contacting Allied Telesyn Technical Support
You can contact Allied Telesyn technical support online or by telephone, fax,
or e-mail.
Online Support
You can request technical support online by filling out the Technical Enquiry
Form or by accessing the Knowledge Base. You can use the Knowledge Base to
submit questions to our technical support staff and review answers to
previously asked questions.
To access the Knowledge Base, select “Support & Services”,then “Help”from
www.alliedtelesyn.com. To access the Technical Enquiry Form, select
“Contact Us”.
Telephone and Fax Support
For Technical Support via fax, please fill out the “Technical Support Fax
Order”on page 31 and send it to the appropriate location listed below.
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
Tel: [phone]
Fax: [phone]
Japan
Tel: [phone]
Fax: [phone]
France
France, Belgium, Luxembourg,
The Netherlands, Middle East, Africa
Tel: [phone]
Fax: [phone]
United Kingdom
United Kingdom, Denmark, Norway,
Sweden, Finland
Tel: [phone]
Fax: [phone]

AT-FS20x and AT-FS202SC/FSx Series Installation Guide
ix
Technical Support E-mail Addresses
United States and Canada
[e-mail]
Latin America, Mexico, Puerto Rico, Caribbean, and Virgin Islands
[e-mail]
Europe
[e-mail]
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:
FTP Server
If you need management software for an Allied Telesyn managed device and
you know the file name of the software, you can download the software by
connecting directly to our FTP server at ftp.alliedtelesyn.com. At login,
enter ‘anonymous’as the user name and your e-mail address for the password.
North America
Toll-free: 1-800-428-4835, option 4
Fax: [phone]
Europe, Africa, and the Middle East
Tel: [phone]
Fax: [phone]
Latin America, the Caribbean, and
Virgin Islands
Tel: international code + 425-481-3852
Fax: international code + 425-481-3895
Puerto Rico
Tel: [phone], ext 3852 or
1-800-424-4284, ext 3852
Mexico
Toll-free: 800-424-5012, ext 3852
Fax: international code + 425-481-3895
Asia and Southeast Asia
Tel: [phone]
Fax: [phone]
Australia
Toll-free: 1-800-000-880
Fax: [phone]
New Zealand
Toll-free: 0800-45-5782

Welcome to Allied Telesyn
x
For Sales or Corporate Information
You can contact Allied Telesyn for sales or corporate information at the
location listed below:
Allied Teleyn International Corp.
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.

1
Chapter 1
Description
The AT-FS20x and AT-FS202SC/FSx Series Fast Ethernet Switches include
the following models:
The AT-FS20x and AT-FS202SC/FSx Series Switches are designed to extend
the distance of your network by converting Fast Ethernet data between
twisted pair cabling and either multimode or single-mode fiber optic cabling.
These dual-port switches can also be used to improve the performance of your
network by dividing it into smaller, more manageable segments.
Each switch features a 100Base-FX fiber optic port and a 10/100Base-TX
twisted pair port. The fiber optic port has either a SC or ST connector and a
maximum operating distance of 2 kilometers (1.2 miles) to 100 kilometers (62
miles), depending on the model. The twisted pair port has a RJ-45 connector
with a maximum operating distance of 100 meters (328 feet).
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-FS20x and AT-FS202SC/FSx Series Switches can be installed on a desktop
or in an AT-MCR12 chassis. These switches are easy to install and do not
require software configuration or management.
❑AT-FS201 ❑AT-FS202SC/FS2
❑AT-FS202 ❑AT-FS202SC/FS3
❑AT-FS202SC/FS1 ❑AT-FS202SC/FS4

Description
2
Figure 1 illustrates the front panel of an AT-FS20x Series Switch.
Figure 1 AT-FS20x Series Front Panel (AT-FS202 Model)
Figure 2 illustrates a front panel of an AT-FS202SC/FSx Series Switch.
Figure 2 AT-FS202SC/FSx Series Front Panel (AT-FS202SC/FS4 Model)
The back panel of the AT-FS20x and AT-FS202SC/FSx Series Switches
features a power adapter connector and DIP switches for manually
configuring the ports. Figure 3 illustrates the back panel.
Figure 3 Back Panel of the AT-FS20x and AT-FS202SC/FSx Series Switches
10Base-T/
100Base-TX
AT-FS202 FAST ETHERNET SWITCH IEEE 802.3/802.3U
LNK/
ACT
FD/
COL
PWR
AUTO
NEG
100M
LNK/
ACT
FD/COL
PORT 2
100Base-FX TX RX
PORT 1
AT-FS202SC/FS4 FAST ETHERNET SWITCH IEEE 802.3/802.3U
LNK/
ACT
FD/
COL
PWR
AUTO
NEG
100M
LNK/
ACT
FD/COL
PORT 2
100Base-FX TX RX
PORT 1
10Base-T/
100Base-TX
CLASS 1
LASER PRODUCT
DO NOT STARE
INTO BEAM
SINGLE MODE
12VDC
21 34
1222
PORT
10
100 HALF FULL OFF ON
DUPLEX
MODE AUTO NEG
SPEED
(Mbps)
DIP Switches
Power Adapter Connector

AT-FS20x and AT-FS202SC/FSx Series Installation Guide
3
Table 1 lists the maximum operating distances for the switches.
Table 1 Maximum Operating Distances
Features
The AT-FS20x and AT-FS202SC/FSx Series Switches have the following
features:
❑LEDs for unit and port status
❑Auto MDI/MDI-X
❑External AC/DC power adapters (North America, Continental Europe,
or United Kingdom)
❑DIP switches for configuring the ports
❑Half- or full-duplex operation on both ports
❑RJ-45 twisted pair connector
❑SC or ST fiber optic connector
❑Data packet forwarding and filtering at full wire speed (10 Mbps to
100 Mbps, 100 Mbps to 100 Mbps, and 10 Mbps to 10 Mbps)
Model
100Base-FX 10/100Base-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-FS201 ST 2 km (1.2 mi) RJ-45 100 m (328 ft)
AT-FS202 SC 2 km (1.2 mi) RJ-45 100 m (328 ft)
AT-FS202SC/FS1 SC 15 km (9.3 mi) RJ-45 100 m (328 ft)
AT-FS202SC/FS2 SC 40 km (24.8 mi) RJ-45 100 m (328 ft)
AT-FS202SC/FS3 SC 75 km (46.5 mi) RJ-45 100 m (328 ft)
AT-FS202SC/FS4 SC 100 km (62 mi) RJ-45 100 m (328 ft)

Description
4
❑Store and forward switching mode
❑Automatic address learning and aging
❑IEEE 802.3u compliant auto-negotiation
❑For use on a desktop or in an AT-MCR12 chassis
Status LEDs
Table 2 defines the LEDs for the switches.
External AC/DC Power Adapter
The power adapter supplies 12V DC to the switch. Allied Telesyn supplies an
approved safety compliant AC power adapter for the 100 and 240V AC
versions with an unregulated output of 12V DC.
Table 2 LEDs
LED Color Description
PWR Green Power is applied to the switch.
LNK/ACT Green
Blinking
A valid link has been established on the port.
Data is being received or transmitted on the port.
100M Green
OFF
The twisted pair port is operating at 100 Mbps.
The twisted pair port is operating at 10 Mbps.
FD/COL Green
OFF
Blinking
The switch is operating in full-duplex mode.
The switch is operating in half-duplex mode.
A collision has been detected on the port.
AUTO NEG Green
OFF
Auto-negotiation on the twisted pair port is enabled.
Auto-negotiation on the twisted pair port is disabled.

AT-FS20x and AT-FS202SC/FSx Series Installation Guide
5
Twisted Pair Port
The AT-FS20x and AT-FS202SC/FSx Series Switches have one 10/
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 10Base-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 switch to set the port speed automatically. With
auto-negotiation, the speed of the 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 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 operate 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 port on the switch can operated in either half- or full-duplex
mode. You can set the duplex mode manually or allow the switch to set it
automatically through auto-negotiation. With auto-negotiation, if the end-
node is capable of full-duplex, the twisted pair port is set automatically to full-
duplex mode. If the end-node is capable of half-duplex, the port is set
automatically to half-duplex mode.
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 switch or hub is usually MDI-X.

Description
6
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-FS20x and AT-FS202SC/FSx Series Switches 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 switch is connected to a port on a bridge, which is
typically wired as MDI, the port on the switch 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-FS20x and AT-FS202SC/FSx Series Switches have one 100Base-FX
fiber optic port. The fiber optic port features either an SC or ST 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 switch must also be able to operate at 100 Mbps.
Duplex Mode
The fiber optic port on the switch can operate in half- or full-duplex mode. You
must set the duplex mode manually using the DIP switches on the back of the
unit.
Switch Performance
The switches perform at:
❑148,800 pps for 100 Mbps and 14,880 pps for 10 Mbps for full wire
speed forwarding and filtering
❑200 Mbps maximum throughput in 100 Mbps, full-duplex mode
❑20 Mbps maximum throughput in 10 Mbps, full-duplex mode
❑Storage for up to 4,000 MAC addresses
❑280 kib bytes (per port) packet buffer
❑Low latency 15.6 µs (64-byte packet, 100 Mbps full-duplex)

AT-FS20x and AT-FS202SC/FSx Series Installation Guide
7
DIP Switches
The DIP switches are used to manually configure the operating characteristics
of the ports. These characteristics include the port speed, duplex mode, and
auto-negotiation.
On the 100Base-FX fiber optic port, you can manually set the duplex mode to
either half- or full-duplex.
On the 10/100Base-TX twisted pair port, you can manually set the speed of
the port to either 10 Mbps or 100 Mbps, set the duplex mode to either half- or
full-duplex and enable or disable auto-negotiation. Enabling auto-negotiation
will automatically set the port’s speed and duplex mode.
MAC Address Table
Up to 4,000 MAC addresses can be stored in the switch’s MAC address table.
The switch’s self-learning feature will learn all new addresses in real-time
after power-up. If the source address of an incoming packet is not found in the
MAC address table, the switch will update the table with the new address.
The switch also has an automatic address aging feature that will delete a
source address from the table if it has not seen a frame from the end-node
with that address within five minutes. This prevents the table from becoming
filled with addresses of end-nodes that are no longer active.
The switch forwards all multicast, broadcast, and unicast packets when the
MAC address table has exceeded its storage limit.
Store and Forward
The AT-FS20x and AT-FS202SC/FSx Series Switches support store and
forward switching at Fast Ethernet full-wire speed in 100 Mbps, half- or full-
duplex mode. Packets entering each port are stored in buffers. Once the full
packet is received, the switch will forward or discard the packet, depending on
its destination address and error status. This ensures that only error-free
packets destined for another segment will be transferred across the switch,
reducing network load. For example, if the packet entering from Port 1 is
destined for an end-node on Port 2, the switch forwards the frame if the frame
does not contain any errors. If the packet from Port 1 is destined for an end-
node also connected to Port 1, the packet is discarded.
The switch will discard CRC errors, misaligned, runt, and under-oversized
packets. When the packet has dribble bits at the end, the switch will truncate
to octet boundary and check for a good FCS before forwarding.

Description
8
Network Topologies
Figure 4 illustrates a topology using one AT-FS201 switch to interconnect two
small networks of stackable hubs. Network 1 has an AT-FH812u with an
AT-FH807u switching module connected to the 100Base-FX port on the
AT-FS201. Network 2 has an AT-3624TR hub connected to the 10/100Base-TX
port on the AT-FS201.
Figure 4 Network Topology
Network 1
AT-FH812u
with an
AT-FH807u
module
AT-FH812u
AT-FH812u
AT-FS201
AT-3624TR
AT-3624TR
AT-3624TR
Network 2
Twisted Pair
Fiber Optic

9
Chapter 2
Installing the Switch
This chapter explains how to install an AT-FS20x or AT-FS202SC/FSx Series
Switch. These switches can be installed on a desktop or in an AT-MCR12
chassis.
Verifying the Package Contents
Make sure the following items are included in your package. If any item is
missing or damaged, contact your Allied Telesyn sales representative for
assistance.
❑One AT-FS20x or AT-FS202SC/FSx Series Switch
❑Four protective feet (for desktop use only)
❑External AC/DC power adapter (North America, Continental Europe,
or United Kingdom)
❑This installation guide
❑Warranty card

Installing the Switch
10
Planning the Installation
Be sure to observe the following guidelines when planning the installation of
your switch.
❑The end-node connected to the 100Base-FX fiber optic port must be
able to operate at 100 Mbps.
❑The end-node connected to the 10/100Base-TX twisted pair port can
operate at either 10 Mbps or 100 Mbps.
❑The end-node connected to a port on the switch can be a network
adapter card, repeater, router, hub, or another switch.
❑The twisted pair cabling must be kept away from sources of electrical
noise, such as radios, transmitters, power lines, broadband amplifiers,
electrical motor, and fluorescent fixtures.
❑Refer to Table 3 for the cabling specifications for the twisted pair port.
❑Refer to Table 4 for the cabling specifications for the fiber optic port
operating in full-duplex mode.
Table 3 10/100Base-TX Twisted Pair Cabling Specifications
Operating Mode Twisted Pair Cable MaximumOperating
Distance
10Base-T Shielded or unshielded Category 3 or better 100 m (328 ft)
100Base-TX Shielded or unshielded Category 5 or better 100 m (328 ft)
Table 4 100Base-FX Fiber Optic Cabling Specifications (Full-duplex)
Model Fiber Optic
Cable Maximum Operating Distance1
Maximum
Allowable Loss
Budget
AT-FS201 50/125 or
62.5/125 micron
multimode
2 km (1.2 mi) 13 dB at 1310 nm
AT-FS202 50/125 or
62.5/125 micron
multimode
2 km (1.2 mi) 13 dB at 1310 nm