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Electrical Safety
IMPORTAN 
: When you see the 

!

, go to the “Translated Safety Information 

Booklet” for the translated safety statement in your language.
Elektrische Sicherheit 
WICHTIG
: Wenn Sie 

!

 sehen, schlagen Sie in der „Broschüre mit übersetzten 

Sicherheitsinformationen“ den übersetzten Sicherheitshinweis in Ihrer Sprache 
nach. (German)
Elektrisk sikkerhed  
VIGTIGT
: Når De ser symbolet 

!

, skal De slå op i "Brochure med oversatte 

sikkerhedsadvarsler" for at finde de oversatte sikkerhedsadvarsler i Deres eget 
sprog. (Danish)
Elektrische veiligheid
BELANRIJK
: Wanneer u het 

!

 ziet, raadpleeg het “Boekje met vertaalde 

veiligheidsinformatie” voor de vertaalde veiligheidsopmerking in uw eigen taal. 
(Dutch)
Sécurité électrique 
IMPORTAN 
: Lorsque vous voyez le symbole 

!

, reportez-vous à la section 

« Livret des traductions des informations de sécurité» pour consulter la traduction 
de ces instructions dans votre langue. (French)
Sähköturvallisuus 
TÄRKEÄÄ
: Kun näet 

!

-symbolin, katso omalle kielellesi käännettyä 

turvaohjetta “Käännetyt turvaohjeet -vihkosesta“. (Finnish)
Sicurezza elettrica
IMPORTANTE
: il simbolo 

!

, indica di consultare l’“Opuscolo delle 

informazioni sulla sicurezza tradotto” per gli avvisi di sicurezza tradotti nella 
propria lingua. (Italian)
Elektrisk sikkerhet
VIKTIG
: Når du ser 

!

, går du til heftet “Oversatt sikkerhetsinformasjon” for å 

finne den oversatte sikkerhetsinformasjonen på ønsket språk. (Norwegian)
Segurança Eléctrica
IMPORTANTE
: Quando vir o símbolo 

!

, consulte a “Folheto de Informação de 

Segurança Traduzido” para ler a tradução da advertência de segurança no seu 
idioma. (Portuguese)
Seguridad eléctrica 
IMPORTANTE
: Cuando vea el símbolo 

!

, vaya al “Libreto de información de 

seguridad traducida” para ver el mensaje de seguridad traducido a su idioma. 
(Spanish)
Elsäkerhet 
OBS!
 När du ser 

!

, skall du gå till “Broschyr innehållande översatt 

säkerhetsinformation” för att läsa det översatta säkerhetsmeddelandet på ditt språk. 
(Swedish)
STANDARDS: This product meets the following standards.
RADIATED ENERGY
U.S. Federal Communications Commission
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 guide, 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 equipment 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.
RFI Emission

EN55022 Class A

!

1

Immunity

EN50082-1

!

3

Warning

In a domestic environment this product may cause radio 
interference in which case the user may be required to take 
adequate measures. 

!

2

ELECTRICAL SAFETY 

TUV-EN60950, UL1950, CSA 950

!

4

Laser                                                                     EN60825    

!

5

Class 1 Laser product

!

6

At time of installation the Fiber Optic Lasers comply with FDA 
Radiation Performance Standard 21CFR Subchapter J, applicable 
at date of manufacture.

Warning Do not stare into the Laser beam

!

7

ELECTRICAL NOTICES

Warning

ELECTRICAL SHOCK HAZARD To prevent ELECTRIC 
shock, do not remove cover. No user-serviceable parts inside. 
This unit contains HAZARDOUS VOLTAGES and should 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.

!

8

LIGHTNING DANGER
DANGER:
 DO NOT WORK on equipment or CABLES during periods of
LIGHTNING ACTIVITY. 

!

9

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 par t s

!

11

ELECTRICAL CORD NOTICE
Use power cord, maximum 4.5 meters long, rated 5 amp minimum, 250V, made of
<HAR> cordage molded IEC 320 connector on one end and on the other end a plug
approved by the country of e n d   u s e

!

12

OPERATING TEMPERATURE
Operating temperature is 0° C - 40° C

!

14

POWER REQUIREMENT
100-120/200-240VAC ~ 50/60Hz, 1.0/0.5A

ALL COUNTRIES
Install product in accordance with local and National Electri c a l   C o d e s

!

15

Verifying Package Contents

Make sure your package contains the following items:

AT-3726XL or AT-3716XL Switch

This Quick Install Guide

Translated Safety Information Booklet

2 mounting brackets

6 flathead Phillips screws 

Power cord (Americas, Europe, United Kingdom)

Warranty card

Switch Overview

The AT-3726XL and AT-3716XL are stand-alone, managed Ethernet 
switches for desktop and workgroup applications. They implement direct 
high-speed server and backbone connections. With built-in management, 
they provide seamless management capability via local or remote (Telnet) 
Omega management software as well as SNMP and web-based 
management). These switches deliver a significant step up in 
performance to attached 10Base-T hubs and direct-connected 
workstations, while protecting existing 10Base adapter card investments. 

Full-duplex operation on both 10Base-T and 100Base-TX/FX ports 
provide up to 200 Mbps of bandwidth to servers, routers, and other 
switches.

Installing the Switch

Caution

Air vents must not be blocked and must have free access to the 
room ambient air for cooling.

!

13

1.

If desk-mounting the unit, make sure that the switch is placed on 
a level, secure desktop. Skip to Step 6.

2.

If rack-mounting the unit, remove all cables and power cord 
from the switch (if previously attached).

3.

Remove the snap-on plastic feet.

4.

Attach the rack-mounting brackets to each side of the switch, 
using the 6 flathead screws provided. 

5.

Mount the unit in the rack.

6.

Apply power to the unit as follows:

Caution

The power cord is used as a disconnect device. To de-energize 
equipment, disconnect the power cord.

!

10

Attach the power cord to the unit and plug it into the wall outlet.
Verify that the PWR LED lights green. See the LEDs table.

R POR

T

RS-232

TERMINAL POR

T

STATUS

RESET

FAUL

T

POWER

For troubleshooting techniques, see Chapter 3, Troubleshooting in the 
AT-3726XL, AT-3716XL, and AT-3714FXL Installation Guide.

Setting Up Terminal for Local Management with Omega

1.

For local management, connect your terminal to the RS232 
connector on the switch’s front panel.

2.

Access your terminal’s emulator program and set the terminal 
settings as shown in the first figure. 

3.

Press Return several times to ensure baud configuration.

You are now ready to access the switch’s management software, Omega. 

For remote management and further details concerning the Omega 
management software, refer to the AT-S20 User’s Guide.

LED

Color

State

Description

PWR (system) 

Green 

ON

The switch is receiving power, voltage is 
within the acceptable range, and the power 
supply is working.

OFF

No power.

FLT (system)

Red

ON

The switch or management software is 
malfunctioning. 
Note: If only the management software is 
malfunctioning, the switch continues to 
forward packets.

OFF

Normal operation.

Flashing

Running diagnostics.

Link OK

Green

ON

There is a physical link with a device.

OFF

No link.

Activity Green

Flashing

The 

Ethernet 

port 

is 

receiving/transmitting 

packets.

OFF

No activity occurring on this port.

2

3

4

5

3701

100BASE-TX

X

MDA

B

100BASE-TX

MIRROR PORT

RS-232

TERMINAL PORT

STATUS

RESET

10BASE-T

PORT ACTIVITY

1

3

5

7

9

11

13

15

2

A

B

4

6

8

10

12

14

16

X

A

1X

3X

5X

7X

2X

4X

6X

8X

9X

11X

13X

15X

10X

12X

14X

16X

LINK

LINK

ACTIVITY

FAULT

POWER

X

10BASE-T ETHERNET SWITCH
with FAST ETHERNET 100BASE ACCESS

3701

100BASE-TX

X

MDA

B

100BASE-TX

MIRROR PORT

RS-232

TERMINAL PORT

STATUS

RESET

10BASE-T

PORT ACTIVITY

1

3

5

7

9

11

13

15

17

19

21

23

2

A

B

4

6

8

10

12

14

16

18

20

22

24

X

A

1X

3X

5X

7X

2X

4X

6X

8X

9X

11X

13X

15X

10X

12X

14X

16X

17X

19X

21X

23X

18X

20X

22X

24X

LINK

LINK

ACTIVITY

FAULT

POWER

X

10BASE-T ETHERNET SWITCH
with FAST ETHERNET 100BASE ACCESS

Use straight-through cable

Port Activity

Mirror Port

RS232

10/100Base-TX

10/100Base-TX

Terminal Default Settings

VT100
8/N/1
Autobaud
Full-duplex

AT-3726XL Switch

10Base-T Ports

AT-3716XL Switch

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