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 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.
Page 3
Electrical Safety and Emission Compliance
Statement
Standards: This product meets the following standards
U.S. Federal Communications Commission
RADIATED ENERGY
Note: This equipment has bee n test ed and found to comply with the
limits for a Class A digital device pursuant to Part 15 of the FCC
Rules. These limits ar e de signed to provide reasonable pro t ection
against harmful inter f erence when the equipment is op erated 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 inte rference at his own
expense.
Note: Modifications or changes not expressly approved by the
manufacturer or the FCC can void your right to operate this
equipment.
Canadian Department of Communications
This Class A di gital apparatus meets all requirements of the
Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences
du Règleme nt s ur le matériel brouilleur du Canada.
!
! 1
3
!
4
5
RFI EmissionEN55022 Class A
WARNING: In a domestic environment this product may cause radio
interference in which case the user m ay be required to take adequate
measures.
Immunity EN50082-1
Electrical SafetyEN60950, UL 1950, CSA 950
LaserEN60825
!
2
!
iii
Page 4
Electrical Safety and Emission Compliance Statement
IMPORTANT: Appendix A contains translated safety statemen ts 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, 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 De
slå op i tillæg A og find e de oversat te sik kerhed sadvars ler i D eres 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 liittyvät
käännetyt turvaohjeet. Kun näet !-symbolin, katso käännettyä
turvaohjetta liitteestä A.
IMPORTANTE: l’Appendice A contiene avvisi di sicurezza tradotti
per l’installazione di questa apparecchiatu ra. 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 utsty ret. Når du ser !, åpner du til Till egg 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 se gurança traduzida no seu idioma no Anexo A.
IMPORTANTE: El Apéndice A contiene mensajes de seguridad
traducidos para la instalació n de este equipo. Cu ando vea el símbo lo
!
, vaya al Apéndice A para ver el mensaje de seguridad traducido a
su idioma.
OBS! Bilaga A innehåller översatta säkerhet smedd eland en avseende
installationen av denna utrustning. När du ser !, skall du gå till
Bilaga A för att läsa det översatta säkerhetsmeddelandet på ditt
språk.
iv
Page 5
Table of Contents
Electrical Safety and Emission Compliance Statement ......................iii
Welcome to Allied Telesyn ......................................................................... vii
Where to Find Web-based Guides ...................................................................vii
The guide provides the required information to install and configure
the AT-FS909SX Fast Ethernet Switch.
Where to Find Web-based Guides
Allied Telesyn wants our customers to be well informed by providing
the most up-to-date and most easily accessible way to find our guides
and other technical inform ation.
Visit our website at
related product information.
www.alliedtelesyn.com/techhome.htm
for
Documentation Conventions
Throughout this guide, you will notice several conventions that you
should become familiar with first before installing the product.
Note
A note provides additional information.
Caution
A caution indicates that performing or omitting a specific action
may reasult in equipment damage or loss of data.
Warning
A warning indicates that performing or omitting a specific
action may result in bodily injury.
vii
Page 8
Welcome to Allied Telesyn
Contacting Allied Teleysn
For Technical Support and Services
Americas
United States, Canada, Mexico,
Central America, South America
Tel: 1 (800) 428-4835
Fax: 1 (503) 639-3176
Asia
Singapore, Taiwan, Thailand,
Malaysia, Indonesia, Korea,
Philippines, China,
India, Hong Kong
Tel: (+65) 3815-612
Fax: (+65) 3833-830
Australia
Australia, New Zealand
Tel: 1 (800) 000-880
Fax: (+61) 2-9438-4966
France
France, Belgium, Luxembourg, The
Netherlands, Middle East, Africa
Tel: (+33) 1-60-92-15-25
Fax: (+33) 1-69-28-37-49
Technical Support E-mail Addresses
United States and Canada
TS1@alliedtelesyn.com
Latin America, Mexico, Puerto Rico, Caribbean, and
Virgin Islands
latin_america@alliedtelesyn.com
United Kingdom, Sweden, Norw ay, De n mark, and Finland
support_europe@alliedtelesyn.com
viii
Page 9
AT-FS909SX Installation Guide
FTP Server
Address: gateway.centre.com [lowercase letters]
Login: anonymous [lowerca se letters]
Password: your e-mail address [requested by the server at login]
For Sales or Corporate Information
Allied Telesyn International, Corp.
19800 North Creek Parkway, Suite 200
Bothell, WA 98011
Tel:1 (425) 487-8880
Fax: 1 (425) 489-9191
Allied Telesyn International, Corp .
960 Stewart Drive, Suite B
Sunnyvale, CA 94086
Tel:1 (800) 424-4284 (USA and Canada)
Fax: 1 (408) 736-0100
Tell Us What You Think
In our continuing efforts to help you get the most from Allied Telesyn,
we look for new and b etter ways to doc ument our prod ucts. If you have
comments or suggestions to improve this or other documents, please
fill out the “AT-FS909SX Installation Guide Feedback” on page 33 and
return to us at the address or fax number provided.
ix
Page 10
Page 11
Chapter 1
Product Description
This chapter describes the features of the AT-FS909SX Fast Ethernet Switch.
Features
The AT-FS909SX is an unmanaged, Fast Ethernet Switch that provides
familiar Eth ernet tech nolo gy with high -speed access. It is a high-p erform ance
switch that ca n be insta l led on the desktop, or into a 19 -in c h rack. It presents
an affordable, ideal solution to the bottlenecks that can occur in networks
where data-intensive applications and a proliferation of new users is
disrupting network throughput. The switch provides the following features:
❑Ethernet, Fast Ethernet, and Gigabit Ethernet connectivity:
eight 10/100Base-TX ports with RJ-45 connectors, and one
1000Base-SX port with SC connectors
❑A small 1.0U high, 13-inch enclosure for desktop, or 19-inch
rack-mount installation
❑Ha lf- or full-duplex operation via auto-negotiation on the
10/100Mbps ports
❑Full-duplex ope ration on the 1000Base-SX port
❑Complies with IEEE 802.3u, IEEE 802.3ab, and IEEE 802.3z
specifications
❑Store-and-forward switching mode
❑Supports extended frame lengths up to 1536 bytes
❑12K MAC addresses with automatic learning and aging
❑4 MB SDRAM for the data buffer of the 10/100Base-TX ports
❑2 MB SGRAM for the data buffer of the 1000Base-SX port
❑LED indicators for Power, and for port Link, Activity, Full-duplex
operation and Collision
❑One media-dependent interface (MDI) button on Port 1
(10/100Mbps) for hub or PC connection
❑Internal autoranging power supply (100-240 VAC)
1
Page 12
Product Description
Physical Description
Figure 1 shows the front panel of the switch.
Figure 1
Figure 2 shows the rear view of the switch showing the AC input and fan
locations.
Figure 3 shows the labels for the LEDs indicators for the two types of ports.
Figure 3
The AT-FS909SX Switch (Front)
Figure 2
LED Indicators Labels (Partial Front Panel)
Rear View of the Switch
2
Page 13
AT-FS909SX Installation Guide
LEDs
Table 1 describes the switch LEDs. Refer to Figure 3 for the labels for the LEDs
for the two types of ports.
AT-FS909SX LED Indicators
Table 1
LEDColorIndicates
PowerGreen OnThe switch is powered up and ready for use.
OffThe switch is powered off.
Gigabit Ethernet Port Status LEDs
Col/FullOrange OnLink is present, full-duplex operation.
Orange FlashingLink is present.
OffLink is not present.
Link/ActOrange OnLink is present on this port.
Orange FlashingPackets are being transmitted/received on this port.
OffLink is not present on this port.
10/100Mbps Port Status LEDs
Col/FullOrange OnLink is present, full-duplex mode.
Orange FlashingLink is present, half-duplex operation with collisions occurring.
(Typical under Ethernet CSMA/CD.)
OffLink is not present (for full-duplex), or
half-duplex operation established with no collisions occurring.
Link/ActOrange On100M Link is present; port is enabled.
Orange Flashing100M Packets are being transmitted/received on this port.
Green On10M Link is present; port is enabled.
Green Flashing10M Packets are being transmitted/received on this port.
OffLink is not present.
3
Page 14
Product Description
MDI Button
The MDI provides you with the flexibilit y for using a st raight-through cab le to
connect to a hub or another switch, or to any DTE such as an end station or a
server. The button is associated with Port 1. Table 2 describes the MDI button
positions.
MDI Positions
Table 2
PositionLabelUse
X
To PC
To connect a DTE to the port
Out
=
In
To Hub
To connect a hub or another switch to the port
Media Type
Table 3 describes the standard (connectors), media, and maximum distances
for each port type.
Media Types and Distances
Table 3
StandardMedia Type
1000Base-SX
(Short Wave = 850 nm)
100Base-TXCategory 5 UTP Cable (100 Mbps)100 m (328 ft)
50/125um Multimode Fiber
Single-mode: not supported
62.5/125um Multimode Fiber
Single-mode: not supported
MHz/Km
Rating
500550 m (1804 ft)
160220 m (722 ft)
Maximum
Distance
10Base-TCategory 3 UTP Cable (10 Mbps)100 m (328 ft)
4
Page 15
AT-FS909SX Installation Guide
AC Power Connector
The switch has a single AC power supply socket in the rear panel, which has
autoranging AC voltage inputs. The input voltage range is 100-240 VAC,
50/60 Hz. The power cord acts as an ON/OFF switch.
Where to Go Next
Proceed to Chapter 2 fo r details on how to install the swi tch .
5
Page 16
Page 17
Chapter 2
Installation
This chapter describes the how to install the AT-FS909SX on a desktop, or into
a 19-inch rack.
Verifying Switch Package Contents
Make sure the following items are included in your switch package. If any of
the following ite ms are missin g or damaged , contac t your sale s repre sentative.
❑One AT-FS909SX switch
❑This Installation Guide
❑Warranty card
❑Four rubber feet for desktop installation
❑Two brackets, eight flathead Phillips screws, and four large screws
and nylon washers for installation into a 19-inch rack
❑Power cord (Americas, EC, Australia, and UK only)
❑Additional serial number stickers, for your convenience
7
Page 18
Installation
Preparing the Site
Use common sense w he n s electing a location f or the swi tc h and obser ve the
following:
❑Make sure that the switch’s power is accessible and cables can b e
connected easily.
❑Cabling must be away from sources of electrical nois e such as radios,
transmitters, broadband amplifiers, power lines, electric motors, and
fluorescent fixtures.
❑Air flow around the switch and through its vents on the side and rear
must not be restricted.
❑If you are installing the switch on a desk, make sure it is placed on a
level, secure desktop.
❑Do not place objects on top of the switch.
❑Do not expose the switch to moisture or water.
❑Make sure it is in a dust-fre e environme nt.
❑Use de dic a ted po wer circuits or power conditioners to supply reliable
electrical power to the network devices.
Review the following precautions before you begin to install the switch.
Warning
LIGHTNING DANGER
DANGER: DO NOT WORK on equipment or CABLES during
periods of LIGHTNING ACTIVITY. ! 9
Warning
ELECTRICAL - TYPE CLASS 1 EQUIPMENT
THIS EQUIPMENT MUST BE EARTHED. Power plug must be
connected to a properly wired earth ground socket outlet. An
improperly wired socket outlet could place hazardous voltages on
.
accessible metal parts
Continue with the desktop installation steps on page 9, or the rack-mount
installatio n steps on page 10.
8
!
11
Page 19
AT-FS909SX Installation Guide
Installing the Switch on a Desktop
1.Locate a level, secure surface for the s w itch.
2.Apply the four rubber feet to the bottom of the switch.
3.Place the switch on the desktop.
Warning
The power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord. ! 10
4.Apply power to the switch by plugging the power cord into the rear of
the unit and plugging the other end into a wall outlet. Verify that the
Power LED lights green.
If the Power LED does not light green, refer to Chapter 3, for further
information.
Warning
Do not stare into the laser beam. ! 7
5.Connect the data cables and observe normal operation as indicated by
the port LEDs. Refer to Table 1 on page 3 for LED information. For
Port 1, set the MDI Button to the correct setting. Refer to Table 2 on
page 4 for the MDI setting.
6.Optional: place one of the additional serial number stickers supplied
with your switch on an accessible part of the switch for your
convenient reference.
9
Page 20
Installation
Installing the Switch into a Rack Mount
Caution
Do not use power tools to perform this installation.
1.Remove all cables and the power cord from the switch (if previously
attached).
Caution
Air vents must not be blocked and must have free access to the room
ambient air for cooling. ! 13
2.Attach the rackmounting brackets to each side of the switch as shown
in Figure 4, using the eight flathead screws that came in the switch
package.
Bracket
Figure 4
Attaching Rackmounting Brackets
Bracket
3.Mount the switch into the rack using four large pan-head screws and
nylon washers (provided).
4.Ensure that there is unrestricted air flow around the switch.
Warning
The power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord. ! 10
5.Apply power to the switch by plugging the power cord into the rear of
the unit and plugging the other end into a power outlet.
If the Power LED does not light green, refer to Chapter 3,
Troubleshooting, fo r fu rther information.
10
Page 21
AT-FS909SX Installation Guide
Warning
Do not stare into the laser beam. ! 7
6.Connect the data cables and observe normal operation as indicated by
the port LEDs. Refer to Table 1 on page 3 for LED information. For
Port 1, set the MDI Button to the correct setting. Refer to Table 2 on
page 4 for the MDI setting.
7.Optional: place one of the additional serial number stickers supplied
with your switch on an accessible part of the switch for your
convenient reference.
Warranty Registration
When you finish the installation, register your product by completing the
enclosed warranty card and sending it in, or by visiting our web site at
www.alliedtelesyn.com/warr-reg.htm and completing the on-line
registration.
11
Page 22
Page 23
Chapter 3
Troubleshooting
This chapter pro vid es i nf orm atio n on how to det e ct and res olve p ro ble ms wi th
your switch. This chapter includes the following sections:
❑How the Switch Reports Problems
❑Network Cabling Problems
❑Common Problems
❑Calling Technical Support
How the Switch Reports Problems
The LEDs indicate problems with the ports and power. See Table 1 on page 3
for a description of the switch LEDs.
Network Cabling Problems
If you have 100Base-TX (Fast Ethernet), some network problems may be
related to exceeding cabling distances. Refer to the standard IEEE 802.3u,
Clause 29.3.1.2 on Worst Case Path Delay Value. This document specifies
that the collision domain diameter must be within the following limits:
❑Under 100 m (328 ft) for TX cabling
Common Problems
This section lists common possible sources of error and actions required to
correct them.
13
Page 24
Troubleshooting
Link /Activity LED on Any Port is OFF
This can indicate:
❑A loose data cable.
❑The device at the other end of the connection is turned OFF.
❑The data cable is not wired correctly (straight/crossed) for the device.
Perform the fo llo wing st eps i n se qu en ce; yo u need not proceed to the n ext step
if the problem is resolved:
1.Make sure t h e data cables are s e cure.
2.Make sure the device at the end of the connection is turned ON.
3.Make sure the data cable is wired correctly (straight/crossed) for the
device.
4.Contact Allied Telesyn’s Technical Support for help.
Power LED is OFF
When there is no power to the swi tch, it cannot operate.
A Power LED that is OFF can indicate:
❑A loose power cord.
❑Power supply failure, malfunction, or loss of power to the power
supply.
❑A power supply voltage below acceptable levels.
❑A high switch temperature due to fan failure or extreme a mbient
temperature.
Perform the fo llo wing st eps i n se qu en ce; yo u need not proceed to the n ext step
if the problem is resolved:
1.Secure the power cord to the power source and check the Power LED
to see if it is ON.
2.Ensure that the voltage is within the required levels in your region.
3.Contact Allied Telesyn’s Technical Support for help.
14
Page 25
AT-FS909SX Installation Guide
Calling Technical Support
When contacting Alli ed Telesyn for suppo r t o n any of i t s products, provid e
Technical Support with the following information:
❑Model and serial number
❑Description of the problem
Refer to page viii or visit our web site at www.alliedtelesyn.com for a list of
worldwide locations and contact information.
15
Page 26
Page 27
Appendix A
Translated Safety and Emission Information
IMPORTANT: This appendix co ntains multi ple-languag e translations fo r the
safety statements in this guide.
WICHTIG: Dieser Anhang enthält Übersetzungen der i n di es em Handbuch
enthaltenen Sicherheitshinweise in mehreren Sprachen.
VIGTIGT: Dette tillæg indeholder oversættelser i flere sprog af
sikkerhedsadvarslerne i denne håndbog.
BELANGRIJK: Deze appendix bevat vertalingen in meerdere talen van de
veiligheidsopmerkingen in deze gids.
IMPORTANT: Cette annexe contient la traduction en plusieurs langues des
instructions de sécurité figurant dans ce guide.
TÄRKEÄÄ: Tämä liite sisältää tässä oppaassa esiintyvät turvaohjeet usealla
kielellä.
IMPORTANTE: questa appendice contiene traduzioni in più lingue degli
avvisi di sicurezza di questa guida.
VIKTIG: Dette tillegget inneholder oversettelser til flere språk av
sikkerhetsinformasjonen i denne veiledningen.
IMPORTANTE: Este anexo contém traduções em vários idiomas das
advertências de segurança neste guia.
IMPORTANTE: Este apéndice con tiene traduccion es en mú ltiples idio mas de
los mensajes de seguridad incluidos en esta guía.
OBS! Denna bilaga innehåller flerspråkiga översättningar av
säkerhetsmeddelandena i de nna handledn ing.
17
Page 28
Translated Safety and Emission Information
Standards
RADIATED ENERGY
Note: This equipment has been tested and found to comply with the limits for a
Class A digital device pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in
accordance with this instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the
interference at his own expense.
Note: Modifications or changes not expressly approved by the manufacturer or the
FCC can void your right to operate this equipment.
This Class A digital apparatus meets all requirements of the Canadia n
Interference-Causing Equipment Regulation s.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement
sur le matériel brouilleur du Canada.
1RFI EmissionEN55022 Class A
!
2
!
3Immunity EN50082-1
!
4Electrical SafetyEN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11ELECTRICAL - TYPE CLASS 1 EQUIPMENT
!
WARNING
which case the user may be required to take adequate measures.
SAFETY
WARNING
WARNING
ELECTRICAL NOTICES
WARNING:
To prevent ELECTRIC shock, do not remove the cover. No user-serviceable parts
inside. This unit contains HAZARDOU S VOLTA GE S and shoul d only be opened by a
trained and qualified technician. To avoid the possibility of ELECTRIC SHOCK,
disconnect electric power to the product before connecting or disconnecting the LAN
cables.
LIGHTNING DANGER
DANGER:
LIGHTNING ACTIVITY.
CAUTION:
ENERGIZE EQUIPMENT, disconnect the power cord.
THIS EQUIPMENT MUST BE EARTHED. Power plug must be connected to a
properly wired earth ground socket outlet. An improperly wired socket outlet could
place hazardous voltages on accessible metal parts.
: This product meets the following standards.
U.S. Federal Communications Commission
Canadian Department of Communications
: In a domestic environment this product may cause radio inte rference in
: Class 1 Laser product.
: Do not stare into the laser beam.
ELECTRIC SHOCK HAZARD
DO NOT WORK on equipment or CABLES during periods of
POWER CORD IS USED AS A DISCONNECTION DEVICE. TO DE-
18
Page 29
AT-FS909SX Installation Guide
12PLUGGABLE EQUIPMENT, the socket outlet shall be installed near the equipment
!
13
!
14
!
15
!
1HochfrequenzstörungEN55022 Klasse A
!
2
!
3StörsicherheitEN50082-1
!
4Elektrische Sicherheit EN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11GERÄTE DER KLASSE 1
!
12STECKBARES GERÄT: Die Anschlußbuchse sollte in der Nähe der Einrichtung
!
13
!
14
!
15
!
and shall be easily accessible.
CAUTION:
ambient air for cooling.
OPERATING TEMPERATURE:
temperature of 40° degrees C.
ALL COUNTRIES:
Codes.
Normen
WARNUNG
hervorrufen. In diesem Fall müßte der Anwender angemessene Gegenmaßnahmen
ergreifen.
SICHERHEIT
WARNUNG
WARNUNG
ACHTUNG:
Das Gehäuse nicht öffnen. Das Gerät enthält keine vom Benutzer wartbaren Teile.
Das Gerät steht unter Hochspannung und darf nur von qualifiziertem technischem
Personal geöffnet werden. Vor Anschluß der LAN-Kabel, Gerät vom Netz trennen.
GEFAHR DURCH BLITZSCHL AG
GEFAHR:
ausführen.
VORSICHT:
STROMVERSORGUNG. ZUR TRENNUNG VOM NETZ, KABEL AUS DE
STECKDOSE ZIEHEN.
DIESE GERÄTE MÜSSEN GEERDET SEIN. Der Netzstecker darf nur mit einer
vorschriftsmäßig geerdeten Steckdose verbunden werden. Ein unvorschriftsmäßiger
Anschluß kann die Metallteile des Gehauses unter gefährliche elektrische
Spannungen setzen.
angebracht werden und leicht zugänglich sein."
VORSICHT
Die Entlüftungsöffnungen dürfen nicht versperrt sein und müssen zum Kühlen freien
Zugang zur Raumluft haben.
BETRIEBSTEMPERATUR:
Umgebungstemperatur von nicht mehr als 40° C entworfen.
ALLE LÄNDER:
entsprechen.
Air vents must not be blocked and must have free access to the room
This product is designed for a maximum ambient
Install product in accordance with local and National Electrical
: Dieses Produkt erfüllt die Anforderungen der nachfolgenden Normen.
: Bei Verwendung zu Hause kann dieses Produkt Funkstörungen
Laserprodukt der Klasse 1.
Nicht direkt in den Strahl blicken.
GEFÄHRLICHE SPANNUNG
Keine Arbeiten am Gerät oder an den Kabeln während eines Gewitters
DAS NETZKABEL DIENT ZUM TRENNEN DE
Dieses Produkt wurde für den Betrieb in einer
Installation muß örtlichen und nationalen elektrischen Vorschriften
19
Page 30
Translated Safety and Emission Information
Standarder
1Radiofrekvens forstyrrelsesemissionEN55022 Klasse A
!
2
!
3ImmunitetEN50082-1
!
4Elektrisk sikkerhedEN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11ELEKTRISK - KLASSE 1-UDSTYR
!
12UDSTYR TIL STIKKONTAKT, stikkontakten bør installeres nær ved udstyret og skal
!
13
!
14
!
15
!
ADVARSEL
Bliver det tilfældet, påkræves brugeren muligvis at tage tilstrækkelige
foranstaltninger.
For at forebygge ELEKTRISK stød, undlad at åbne apparatet. Der er ingen indre dele,
der kan repareres af brugeren. Denne enhed indehold e r LIVSFARLIGE
STRØMSPÆNDINGER og bør kun åbnes af en uddannet og kvalificeret tekniker. For
at undgå risiko for ELEKTRISK STØD, afbrydes den elektriske strøm til produktet,
før LAN-kablerne monteres eller afmonteres.
FARE UNDER UVEJR
FARE:
LYNAKTIVITET.
ADVARSEL:
STRØMMEN. SKAL STRØMMEN TIL APPARATET AFBRYDES, tages ledningen
ud af stikket.
DETTE UDSTYR KRÆVER JORDFORBINDELSE. Stikket skal være forbundet med
en korrekt installeret jordforbunden stikkontakt. En ukorrekt installeret stikkontakt
kan sætte livsfarlig spænding til tilgængelige metaldele.
være lettilgængelig.
ADVARSEL:
omgivende luft i rummet for afkøling.
BETJENINGSTEMPERATUR:
temperatur på maksimum 40 grader C.
ALLE LANDE:
national lovgivning for elektriske installationer.
: Dette produkt tilfredsstiller de følgende standarder.
: I et hjemligt miljø kunne dette produkt forårsage radio forstyrrelse.
Laserprodukt av klasse 1.
Stirr ikke på strålen.
RISIKO FOR ELEKTRISK STØD
UNDLAD at arbejde på udstyr eller KABLER i perioder med
DEN STRØMFØRENDE LEDNING BRUGES TIL AT AFBRYDE
Ventilationsåbninger må ikke blokeres og skal have fri adgang til den
Dette apparat er konstrueret til en omgivende
Installation af produktet skal ske i overensstemmelse med lokal og
20
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AT-FS909SX Installation Guide
: Dit product voldoet aan de volgende eisen.
Eisen
1RFI EmissieEN55022 Klasse A
!
2
!
3ImmuniteitEN50082-1
!
4Electrische VeiligheidEN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11ELEKTRISCHE TOESTELLEN VAN KLASSE 1
!
12AAN TE SLUITEN APPARATUUR, de contactdoos wordt in de nabijheid van de
!
13
!
14
!
15
!
WAARSCHUWING
geval de gebruiker verplicht kan worden om gepaste maatregelen te nemen.
VEILIGHEID
WAARSHUWING
WAARCHUWING
WAARSCHUWINGEN MET BETREKKING TOT ELEKTRICITEIT
WAARSCHUWING:
Verwijder het deksel niet, teneinde ELEKTRISCHE schokken te voorkomen. Binnenin
bevinden zich geen onderdelen die door de gebruiker onderhouden kunnen worden. Dit
toestel staat onder GEVAARLIJKE SPANNING en mag alleen worden geopend door
een daartoe opgeleide en bevoegde technicus. Om het gevaar op ELEKTRISCHE
SCHOKKEN te vermijden, moet u het toestel van de stroombron ontkoppelen alvorens
de LAN-kabels te koppelen of ontkoppelen.
GEVAAR VOOR BLIKSEMINSLAG
GEVAAR:
WAARSCHUWING:
STROOMKABEL TE ONTKOPPELEN.OM HET T OESTEL STROOMLOOS TE
MAKEN: de stroomkabel ontkoppelen.
DIT TOESTEL MOET GEAARD WORDEN. De stekker moet aangesloten zijn op een
juist geaarde contactdoos. Een onjuist geaarde contactdoos kan de metalen onderdelen
waarmee de gebruiker eventueel in aanraking komt onder gevaarlijke spanning
stellen.
apparatuur geïnstalleerd en is gemakkelijk te bereiken."
OPGELET:
omgevingslucht ongehinderd toelaten voor afkoeling.
BEDRIJFSTEMPERATUUR:
meer bedragen dan 40 graden Celsius.
ALLE LANDEN:
elektrische voorschriften.
NIET aan toestellen of KABELS WERKEN bij BLIKSEM.
: Binnenshuis kan dit product radiostoring veroorzaken, in welk
Klasse-1 laser produkt.
Neit in de straal staren.
GEVAAR VOOR ELEKTRISCHE SCHOKKEN
HET TOESTEL WORDT UITGESCHAKELD DOOR DE
De ventilatiegaten mogen niet worden gesperd en moeten de
De omgevingstemperatuur voor dit produkt mag niet
het toestel installeren overeenkomstig de lokale en nationale
21
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Translated Safety and Emission Information
Normes:
1Emission d’interférences radioélectriques EN55022 Classe
!
2
!
3ImmunitéEN50082-1
!
4Sécurité électriqueEN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11ÉQUIPEMENT DE CLASSE 1 ÉLECTRIQUE
!
12EQUIPEMENT POUR BRANCHEMENT ELECTRIQUE, la prise de sortie doit être
!
13
!
14
!
15
!
MISE EN GARDE
des interférences radioélectriques. Auquel cas, l’utilisateur devra prendre les mesures
adéquates.
SÉCURITÉ
ATTENTION
ATTENTION
INFORMATION SUR LES RISQUES ÉLECTRIQUES
AVERTISSEMENT
Pour éviter toute ÉLECTROCUTION, ne pas ôter le revêtement protecteur du
matériel. Ce matériel ne contient aucun élément réparable par l’utilisateur. Il
comprend des TENSIONS DANGEREUSES et ne doit être ouvert que par un
technicien dûment qualifié. Pour éviter tout risque d’ÉLECTROCUTION, débrancher
le matériel avant de connecter ou de déconnecter les câbles LAN.
DANGER DE FOUDRE
DANGER:
ATTENTION:
POUR COUPER L’ALIMENTATION DU MATÉRIEL, débrancher le cordon.
CE MATÉRIEL DOIT ÊTRE MIS A LA TERRE. La prise de courant doit être branchée
dans une prise femelle correctement mise à la terre car des tensions dangereuses
risqueraient d’atteindre les pièces métalliques accessibles à l’utilisateur.
placée près de l’équipement et facilement accessible".
ATTENTION:
circuler librement pour le refroidissement.
TEMPÉRATURE DE FONCTIONNEMENT:
température ambiante maximum de ou 40 degrés Celsius.
POUR TOUS PAYS:
nationales et locales.
ce produit est conforme aux normes de suivantes:
A
: dans un environnement domestique, ce produit peut provoquer
Producit laser di classe 1.
Ne pas fixer le faisceau des yeux.
: DANGER D’ÉLECTROCUTION
NE PAS MANIER le matériel ou les CÂBLES lors d’activité orageuse.
LE CORDON D’ALIMENTATION SERT DE MISE HORS CIRCUIT.
Ne pas bloquer les fentes d’aération, ceci empêcherait l’air ambiant de
Ce matériel est capable de tolérer une
Installer le matériel conformément aux normes électriques
22
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AT-FS909SX Installation Guide
Standardit
1Radioaaltojen häirintäEN55022 Luokka A
!
2VAROITUS: Kotiolosuhteissa tämä laite voi aiheuttaa radioaaltojen häiröitä, missä
!
3KestävyysEN50082-1
!
4SähköturvallisuusEN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11SÄHKÖ - TYYPPILUOKAN 1 LAITTEET
!
12PISTORASIAAN KYTKETTÄVÄ LAITE; pistorasia on asennettava laitteen lähelle ja
!
13
!
14
!
15
!
tapauksessa laitteen käyttäjän on mahdollis est i ryhdyttä vä tarpee llis iin
toimenpiteisiin.
TURVALLISUUS
VAROITUS
VARIOTUS
SÄHKÖÖN LIITTYVIÄ HUOMAUTUKSIA
VAROITUS:
Estääksesi SÄHKÖISKUN älä poista kantta. Sisällä ei ole käyttäjän huollettavissa
olevia osia. Tämä laite sisältää VAARALLISIA JÄNNITTEITÄ ja sen voi avata vain
koulutettu ja pätevä teknikko. Välttääksesi S ÄHKÖ ISKU N mahdollisuude n katkaise
sähkövirta tuotteeseen ennen kuin liität tai irrotat paikallisverkon (LAN) kaapelit.
SALAMANISKUVAARA
HENGENVAARA:
SALAMOINNIN A IK A NA .
HUOMAUTUS:
VIRTA KATKAISTAAN irrottamalla virtajohto.
TÄMÄ LAITE TÄYTYY MAADOITTAA. Pistoke täytyy liittää kunnollisesti
maadoitettuun pistorasiaan. Virheellisesti johdotettu pistorasia voi altista a
metalliosat vaarallisille jännitteille.
siihen on oltava esteetön pääsy."
HUOMAUTUS:
ympäröivään huoneilmaan, jotta ilmanvaihto tapahtuisi.
KÄYTTÖLÄMPÖTILA:
maksimilämpötilalle 40°C.
KAIKKI MAAT:
sähköturvallisuusmääräysten mukaisesti.
: Tämä tuote on seuraavien standardien mukainen.
Luokan 1 Lasertuote.
Älä katso säteeseen.
SÄHKÖISKUVAARA
ÄLÄ TYÖSKENTELE laitteiden tai KAAPELEIDEN KANSSA
VIRTAJOHTOA KÄYTETÄÄN VIRRANKATKAISULAITTEENA.
Ilmavaihtoreikiä ei pidä tukkia ja niillä täytyy olla vapaa yhteys
Tämä tuote on suunniteltu ympäröivän ilman
Asenna tuote paikallisten ja kansallisten
23
Page 34
Translated Safety and Emission Information
Standard
1Emissione RFI (interferenza di radiofrequenza) EN55022 Classe A
!
2
!
3ImmunitàEN50082-1
!
4Sicurezza elettricaEN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11ELETTRICITÀ - DISPOSITIVI DI CLASSE 1
!
12APPARECCHIATURA COLLEGABILE, la pr esa v a in stallata vicino all’apparecchio
!
13
!
14
!
15
!
AVVERTENZA:
interferenza. In questo caso potrebbe richiedersi all’utente di prendere gli adeguati
provvedimenti.
NORME DI SICUREZZA
AVVERTENZA
AVERTENZA
AVVERTENZE ELETTRICHE
ATTENZIONE:
Per evitare SCOSSE ELETTRICHE non asportare il coperchio. Le componenti interne
non sono riparabili dall’utente. Questa unità ha TENSIONI PERICOLOSE e va aperta
solamente da un tecnico specializzato e qualificato. Per evitare ogni possibilità di
SCOSSE ELETTRICHE, interrompere l’alimentazione del dispositivo prima di
collegare o staccare i cavi LAN.
PERICOLO DI FULMINI
PERICOLO:
TEMPORALESCHE.
ATTENZIONE:
DISATTIVAZIONE. PER TOGLIERE L A CORRENTE AL DISPOSITIVO staccare il
cavo di alimentazione.
QUESTO DISPOSITIVO DEVE AVERE LA MESSA A TERRA. La spina deve essere
inserita in una presa di corrente specificamente dotata di messa a terra. Una presa
non cablata in maniera corretta rischia di scaricare una tensione pericolosa su parti
metalliche accessibili.
per risultare facilmente accessibile".
ATTENZIONE:
ricircolo dell’aria ambiente per il raffreddamento.
TEMPERATURA DI FUNZIONAMENTO:
temperatura ambientale massima di 40 gradi centigradi.
TUTTI I PAESI:
nazionali.
: Questo prodotto è conforme ai seguenti standard.
in ambiente domestico questo prodotto potrebbe causare radio
Prodotto laser di Classe 1.
Non fissare il raggio con gli occhi.
PERICOLO DI SCOSSE ELETTRICHE
NON LAVORARE sul dispositivo o sui CAVI durante PRECIPITAZIONI
IL CAVO DI ALIMENTAZIONE È USATO COME DISPOSITIVO DI
le prese d’aria non vanno ostruite e devono consentire il libero
Questo prodotto è concepito per una
installare il prodotto in conformità delle vigenti normative elettriche
24
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AT-FS909SX Installation Guide
Sikkerhetsnormer
1RFI strålingEN55022 Klasse A
!
2
!
3ImmunitetEN50082-1
!
4Elektrisk sikkerhetEN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11ELEKTRISK - TYPE 1- KLASSE UTSTYR
!
12UTSTYR FOR STIKKONTAKT. Stikkontakten skal monteres i nærheten av utstyret
!
13
!
14
!
15
!
ADVARSEL
radioforstyrrelse. Hvis dette skjer, må brukeren ta de nødvendige forholdsregler.
SIKKERHET
ADVARSEL
ADVARSAL
ELEKTRISITET
ADVARSEL:
For å unngå ELEKTRISK sjokk, må dekslet ikke tas av. Det finnes ingen deler som
brukeren kan reparere på innsiden. Denne enheten inneholder FARLIGE
SPENNINGER, og må kun åpnes av en faglig kvalifisert tekniker. For å unngå
ELEKTRISK SJOKK må den elektriske strømmen til produktet være avslått før LANkablene til- eller frakobles.
FARE FOR LYNNEDSLAG
ARBEID IKKE på utstyr eller KABLER i TORDENVÆR.
FARE:
FORSIKTIG:
Å DEAKTIVISERE UTSTYRET, må strømforsyningen kobles fra.
DETTE UTSTYRET MÅ JORDES. Strømkontakten må være tilkoplet en korrekt
jordet kontakt. En kontakt som ikke er korrekt jordet kan føre til farlig spenninger i
lett t ilgjengelige metalldeler.
og skal være lett tilgjengelig."
FORSIKTIG:
romtemperatur for avkjøling.
DRIFTSTEMPERATUR:
romtemperatur på 40 grader celsius.
ALLE LAND:
elektriske koder.
: Dette produktet tilfredsstiller følgende sikkerhetsnormer.
: Hvis dette produktet benyttes til privat bruk, kan produktet forårsake
Laserprodukt av klasse 1.
Stirr ikke på strålen.
FARE FOR ELEKTRISK SJOKK
STRØMLEDNINGEN BRUKES TIL Å FRAKOBLE UTSTYRET. FOR
Lufteventilene må ikke blokkeres, og må ha fri tilgang til luft med
Dette produktet er konstruert for bruk i maksimum
Produktet må installeres i samsvar med de lokale og nasjonale
25
Page 36
Translated Safety and Emission Information
Padrões
1Emissão de interferência de radiofrequênciaEN55022 Classe A
!
2
!
3ImunidadeEN50082-1
!
4Segurança EléctricaEN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11ELÉTRICO - EQUIPAMENTOS DO TIPO CLASSE 1
!
12EQUIPAMENTO DE LIGAÇÃO, a tomada eléctrica deve estar instalada perto do
!
13
!
14
!
15
!
AVISO
radiorrecepção e, neste caso, pode ser necessário que o utente tome as medidas
adequadas.
SEGURANÇA
AVISO
AVISO
AVISOS SOBRE CARACTERÍSTICAS ELÉTRICAS
ATENÇÃO:
Para evitar CHOQUE ELÉTRICO, não retire a tampa. Não contém peças que possam
ser consertadas pelo usuário. Este aparelho contém VOLTAGENS PERIGOSAS e só
deve ser aberto por um técnico qualificado e treinado. Para evitar a possibilidade de
CHOQUE ELÉTRICO, desconecte o apa re lho da fo nte de energia elétrica antes de
conectar e desconectar os cabos da LAN.
PERIGO DE CHOQUE CAUSADO POR RAIO
PERIGO:
suscetíveis a QUEDAS DE RAIO.
CUIDADO:
DE DESCONEXÃO. PARA DESELETRIFICAR O EQUIPAMENTO, desconecte o cabo
de ALIMENTAÇÃO.
DEVE SER FEITA LIGAÇÃO DE FIO TERRA PARA ESTE EQU IPAMENTO. O
plugue de alimentação deve ser conectado a uma tomada com adequada ligação de fio
terra. Tomadas sem adequada ligação de fio terra podem transmitir voltagens
perigosas a peças metálicas expostas.
equipamento e ser de fácil acesso."
CUIDADO:
livre ao ar ambiente para arrefecimento adequado do aparelho.
TEMPERATURA DE FUNCIONAME NTO:
temperatura ambiente máxima de 40 graus centígrados.
TODOS OS PAÍSES:
para instalações elétricas.
: Este produto atende aos seguintes padrões.
: Num ambiente doméstico este produto pode causar interferência na
Produto laser de classe 1
Não olhe fixamente para o raio.
PERIGO DE CHOQUE ELÉTRICO
NÃO TRABALHE no equipamento ou nos CABOS durante períodos
O CABO DE ALIMENTAÇÃO É UTILIZADO COMO UM DISPOSITIVO
As aberturas de ventilação não devem ser bloqueadas e devem ter acesso
Este produto foi projetado para uma
Instale o produto de acordo com as normas nacionais e locais
26
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AT-FS909SX Installation Guide
Estándares:
1Emisión RFIEN55022 Clase
!
2
!
3InmunidadEN50082-1
!
4Seguridad eléctricaEN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11ELECTRICO - EQUIPO DEL TIPO CLASE 1
!
12EQUIPO CONECTABLE, el tomacorriente se debe instalar cerca del equipo, en un
!
13
!
14
!
15
!
ADVERTENCIA
radiointerferencias, en cuyo caso, puede requerirse del usuario que tome las medidas
que sean convenientes al respecto.
Para evitar un ELECTROCHOQUE, no quite la tapa. No hay ningún componente en
el interior al cual puede prestar servicio el usuario. Esta unidad contiene VOLTAJES
PELIGROSOS y sólo deberá abrirla un técnico entrenado y calificado. Para evitar la
posibilidad de ELECTROCHOQUE desconecte la corriente eléctrica que llega al
producto antes de conectar o desconectar los cables LAN.
PELIGRO DE RAYOS
PELIGRO:
equipos o en LOS CABLES durante TORMENTAS ELECT RICAS.
ATENCION:
DISPOSITIVO DE DESCONEXION. PARA DESACTIVAR EL EQUIPO, d esc onecte
el cable de alimentación.
ESTE EQUIPO TIENE QUE TENER CONEX ION A TIERRA. El cable tiene que
conectarse a un enchufe a tierra debidamente instalado. Un enchufe que no está
correctamente instalado podría ocasionar tensiones peligrosas en las partes metálicas
que están expuestas.
lugar con acceso fácil".
ATENCION:
acceso libre al aire ambiental de la sala para su enfriamiento.
TEMPERATURA REQUERIDA PARA LA OPERACIÓN:
diseñado para una temperatura ambiental máxima de 40 grados C.
PARA TODOS LOS PAÍSES:
Eléctricos locales y nacionales.
Este producto cumple con los siguientes estándares.
A
: en un entorno doméstico, este producto puede causar
Producto láser Clase 1.
No mirat fijamente el haz.
PELIGRO DE ELECTROCHOQUE
NO REALICE NINGUN TIPO DE TRABAJO O CONEXION en los
EL CABLE DE ALIMENTACION SE USA COMO UN
Las aberturas para ventilación no deberán bloquearse y deberán tener
Este producto está
Monte el producto de acuerdo con los Códigos
27
Page 38
Translated Safety and Emission Information
Standarder: Denna produkt uppfyller följande standarder.
1RadiostörningEN55022 Klass A
!
2
!
3ImmunitetEN50082-1
!
4Elsäkerhet EN60950, UL1950, CSA 950
!
5LaserEN60825
!
6
!
7
!
8
!
9
!
10
!
11ELEKTRISKT -- TYP KLASS 1 UTRUSTNING
!
12
!
13
!
14
!
15
!
VARNING:
tvinga användaren till att vidtaga erforderliga åtgärder
SÄKERHET
VARNING!
VARNING!
TILLKÄNNAGIVANDEN BETRÄFFANDE ELEKTRICITETSRISK:
RISK FÖR ELEKTRISK STÖT
Det finns inga delar inuti som behöver underhålla s. Denna app arat är und er
HÖGSPÄNNING och får endast öppnas av en utbildad kvalificerad tekniker. För att
undvika ELEKTRISK STÖT, koppla ifrån produkt ens strömanslut n i ng innan LANkablarna ansluts eller kopplas ur.
FARA FÖR BLIXTNEDSLAG
FARA:
VARNING:
FRÅN STRÖMMEN, dra ur nätkabeln.
DENNA UTRUSTNING MÅSTE VARA JORDAD. Nä tka be ln måste v ara ansluten till
ett ordentligt jordat uttag. Ett felaktigt uttag kan göra att närliggande metalldelar
utsätts för högspänning. Apparaten skall anslutas till jordat uttag, när den ansluts till
ett nätverk.
UTRUSTNING MED PLUGG.
vara lättåtkomligt".
VARNING:
rumsluft för avsvalning.
DRIFTSTEMPERATUR
Denna produkt är konstruerad för rumstemperatur ej överstigande 40 grader Celsius
Alla länder:
elektrisk utrustning.
Denna produkt kan ge upphov till radiostörningar i hemmet, vilket kan
Laserprodukt av klass 1.
Laserstrålning när enheten är öppen.
För att undvika ELEKTRISK stöt, ta ej av locket.
ARBETA EJ på utrustningen eller kablarna vid ÅSKV ÄDER.
NÄTKABELN ANVÄNDS SOM STRÖMBRYTARE FÖR ATT KOPPLA
Uttaget skall installeras i utrustningens närhet och
Luftventilerna får ej blockeras och måste ha fri tillgång till omgivande
Installera produkten i enlighet med lokala och statliga bestämmelser för
28
Page 39
Appendix B
Technical Specifications
The sections that follow list the technical specifications for the AT-FS909SX.
Physical Sp ecifications
Dimensions:(W x D x H)
330 mm x 230 mm x 43 mm
(13 in x 9.05 in x 1.69 in)
Weight:2.55 kg (5.6 lb)
Environmental Specifications
Operating Temperature:0° to 40° C (32° to 104° F)
Storage Temperature:-20° to 70° C (-4° to 158° F)
Operating Humidity:10% to 90% non-condensing
Non-operating Humidity:10% to 95% non-condensing
Power Specifications
Maximum Power
Consumption:13.7 W
AC Input Voltage:100-240VAC, 50/60Hz.
Agency Compliance
Standard:IEEE 802.3u, IEEE 802.3ab, IEEE 802.3z
EMI/RFI:Meets FCC Class A, EN55022 Class A,
VCCI Class A
Safety:Conforms to UL 1950, CSA C22.2 No. 950,
TUV EN 60950
Immunity:Conforms to EN50082-1
CE Compliant
Model number of Allied Telesyn product I am using __________________
Firmware release number of Allied Telesyn product _________________
Other network software products I am using (e.g., network managers)
______________________________________________________________________
Detailed description (Please use separate sheet)
Please also fax printouts of relevant files such as batch files and
configuration files. When completed, fax this s heet to the approp riate
Allied Telesyn office. Fax numbers can be found on page viii.
31
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Page 43
Appendix D
AT-FS909SX Installation Guide Feedback
Please tell us what additional information you would like to see
discussed in this guide. If there are topics you would like information
on that were not covered in this guide, please photocopy this page,
answer the questions and fax or mail this form back to Allied Telesyn.
The mailing address and fax number are at the bottom of the page.
Your comments are valuable when we plan future revisions of this
guide.
I found the following the most valuable _______________ ____________