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OfficeConnect

®

Cable/DSL Gateway 

(3C857)

About This Guide:

This Guide takes you through the basic steps necessary to install and configure
your OfficeConnect Cable/DSL Gateway, and establish a connection from your
computers to the Internet.  Throughout, the OfficeConnect Cable/DSL
Gateway is simply referred to as the Gateway.

Your package contains:

One OfficeConnect Cable/DSL Gateway

One power adapter for use with the Gateway

Four rubber feet

One Ethernet cable

One CD-ROM containing the Gateway Discovery program and the User Guide

This Installation Guide

One Support and Safety Information Sheet

One Warranty Flyer

System Requirements

Before starting, you must ensure the following:

You already have a cable or DSL broadband connection to the Internet, with 
a suitable modem, and that this connection works properly.  The modem 
must have an Ethernet port for connection to your Gateway.

You have a computer that has an Ethernet connection available and is 
already correctly configured for communication with the Internet.  Your 
computer must be able to connect to the Internet via the modem, and must 
have a Web browser installed.

There are no other DHCP server devices on your local network that are 
responsible for allocating IP addresses to your computers and other network- 
connected devices. Your Gateway will now perform this function by default.

If one or more of these conditions are not met, refer to the comprehensive
Gateway User Guide provided on the accompanying CD-ROM for further guidance.

INTRODUCTION

ABOUT YOUR GATEWAY

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OfficeConnect

 Cable/DSL Gateway

3C857

LAN Status

Cable/DSL

Alert

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Ethernet

Cable/

DSL

Safety Information

WARNING:

Please read the ‘Important Safety Information’ section in the

Support and Safety Information sheet before you start.

VORSICHT:

Bitte lesen Sie den Abschnitt ‘Wichtige

Sicherheitsinformationen’ sorgfältig durch, bevor Sie das Gerät einschalten.

AVERTISSEMENT:

Veuillez lire attentivement la section "Consignes

importantes de sécurité" avant de mettre en route.

When positioning your Gateway, ensure:

It is out of direct sunlight and away from sources of heat.

Cabling is away from power lines, fluorescent lighting fixtures, and
sources of electrical noise such as radios, transmitters and broadband
amplifiers.

Water or moisture cannot enter the case of the unit.

Air flow around the unit and through the vents in the side of the case
is not restricted. We recommend you provide a minimum of 25mm
(1in.) clearance.

Using the Rubber Feet

Use the four self-adhesive rubber feet to prevent your Gateway from
moving around on your desk or when stacking with other flat top
OfficeConnect units. Only stick the feet to the marked areas at each
corner of the underside of your Gateway. 

3 Four LAN Status LEDs

green (100Mbps link) / yellow (10Mbps link)

If the LED is on, the link between the port and the
next piece of network equipment is OK. If the LED is
flashing, the link is OK and data is being transmitted
or received. If the LED is off, nothing is connected, or
the connected device is switched off, or there is a
problem with the connection (refer to the 'Problem
Solving' section). The port will automatically adjust to
the correct speed and duplex.

4 Cable/DSL Status LED

green (100Mbps link) / yellow (10Mbps link)

If the LED is on, the link between the Gateway and
the cable or DSL modem is OK.  If the LED is flashing,
the link is OK and data is being transmitted or
received.  If the LED is off, nothing is connected, the
modem is switched off or there is a problem (refer to
the "Problem Solving" section).

5 Power Adapter socket

Only use the power adapter that is supplied with
this Gateway.  Do not use any other adapter.

6 Ethernet Cable/DSL port

The Ethernet Cable/DSL port is configured as MDI,
for connection to your modem with the supplied
straight-through patch cable. The port will 
automatically adjust to the correct speed and
duplex.

7 Four 10/100 LAN ports

Using a suitable RJ-45 cable, you can connect your
Gateway to a computer, or to any other piece of
equipment that has an Ethernet connection (for
example, a hub or a switch). The LAN ports are
configured as MDIX, for connection to a computer
with a straight through RJ-45 cable.

1 Alert LED

orange

Indicates a number of different conditions, as
described below.

Off

- The Gateway is operating normally.

Flashing quickly

- Indicates one of the following

conditions:

• The Gateway has just been started up and is

running a self-test routine, or

• The administrator has invoked the 

Reset to Factory

Defaults

command, or

• The system software is in the process of being

upgraded

In each of these cases, wait until the Gateway has
completed the current operation and the alert LED 
is Off.

Flashing slowly

- The Gateway has completed the

Reset to Factory Defaults

process, and is waiting for

you to reset the unit.  To do this, remove power, wait
10 seconds and then re-apply power.  The Gateway
will then enter the start-up sequence and resume
normal operation.

On for 2 seconds, and then off

- The Gateway has

detected and prevented a hacker from attacking your
network from the Internet.

Continuously on

- A fault has been detected with

your Gateway during the start-up process.  Refer to
the main User Guide.

2 Power LED

green

Indicates that the Gateway is powered on.

Cable/DSL Gateway - Front

Cable/DSL Gateway - Rear

Installation Guide

POSITIONING YOUR GATEWAY

Dimensions and Operating Conditions

* Refer to Regulatory Notices section in the Support and Safety Information sheet

Cable/DSL Gateway
7 VA, 23.9 BThU/hr 
power requirement

0 to 40ºC (32 to 105ºF) 
operating 
temperature

0 to 90%  
(non-condensing) 
humidity

Cable/DSL Gateway 
535g (1.3 lb)

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DIMENSIONS AND STANDARDS

Standards

Functional:

ISO 8802/3
IEEE 802.3, 802.3u

Safety:

UL 1950, EN 60950
CSA 22.2 #950, 
IEC60950

EMC:

EN 55022 Class B
EN 55024
FCC Part 15 Class B*
ICES-003 Class B
VCCI Class B
CNS 13438 Class A

Environmental:

EN 60068 (IEC 68)

3Com Corporation, Corporate Headquarters, 5400 Bayfront Plaza, Santa Clara, CA 95052-8145

Copyright © 2002 3Com Corporation. All rights reserved. 3Com, the 3Com logo, and OfficeConnect
are registered trademarks of 3Com Corporation. 

Microsoft, MS-DOS and Windows are registered trademarks of Micorsoft Corporation.

All other company and product names may be trademarks of their respective companies.

Part number: DIA0085-5AAA02  Published: August 2002

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