3COM 3CNJ100 User Manual

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Installation Guide

NJ100 Network Jack

3CNJ100

4-port10/100 Mbps Unmanaged Ethernet Switch

http://www.3com.com/

http://www.3com.com/productreg

09-2141-000

Published September 2001

3Com Corporation 5400 Bayfront Plaza Santa Clara, California95052-8145U.S.A.

Copyright © 2001 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change.

3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document, in the hard copy documentation, or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense. Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014(June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is provided

with only such rights as are provided in 3Com’s standard commercial license for the software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015(Nov 1995) or FAR52.227-14(June 1987), whichever is applicable. You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in, or delivered to you in conjunction with, this user guide.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries.

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Contents

About the Network Jack

2

 

 

 

 

Before You Begin

6

 

 

 

 

 

Obtaining Optional Components

7

 

 

Installing the Network Jack

8

 

 

 

 

Setting up the Power Supply

10

 

 

Using an Integrated Switch with Power Over

Ethernet

10

 

 

 

 

 

 

Using a Multi-portEthernet Power Supply

10

Using a Single-portEthernet Power Supply

12

Using the 3Com Local Power Supply

12

 

Setting the Power Over Ethernet Dip Switches

13

Installing the Adapter Plate and Pass-ThroughPorts 15

Planning the Installation

17

 

 

 

 

Setting up the Network Cabling at Your Site

19

Connecting the Network Jack to the Network

19

Mounting the Network Jack

22

 

 

 

Connecting the Local Power Supply (Optional)

23

Connecting Devices to the Network Jack

23

 

Checking the LEDs

24

 

 

 

 

 

Troubleshooting the Network Jack

24

 

 

Specifications

26

 

 

 

 

 

 

Contents

Contacting Technical Support

28

 

One-YearFree Installation Support

28

Online Technical Services 29

 

 

World Wide Web Site

29

 

 

3Com Knowledgebase Web Services

29

3Com FTP Site 30

 

 

 

Support from Your Network Supplier

30

Support from 3Com

31

 

 

Returning Products for Repair

31

 

3Com Corporation Limited Warranty

33

FCC Class A Verification Statement 37

FCC Declaration of Conformity

37

 

Installation Guide

The 3Com Network Jack is a 4-port,unmanaged Ethernet switch that fits into any standard electrical wall outlet or data port opening.

The Network Jack brings switching capabilities to any single port on an Ethernet network by allowing up to four networking devices, such as computers, printers, Voice Over IP (VoIP) telephones, and scanners, to be connected to the network via one Ethernet port. Optional connectors are also available that allow up to two additional devices to be connected to separate network segments through the same Network Jack.

The Network Jack needs no software to operate and little or no configuration. All ports feature 10/100 Mbps auto-negotiation,which configures the Network Jack for 10 Mbps or 100 Mbps connections automatically.

Power to the Network Jack can be provided one of the following ways:

Over the network via an integrated switch that supports Power Over Ethernet; specifically, a switch that is compatible with Capacitive Power Discovery Process (24V or 48V) or IEEE 802.3af-compatiblePower Over Ethernet. Power Over Ethernet, also known asin-linepower, is a feature that provides power onto an Ethernet cable, allowing a device to receive both data and power from the same network cable.

Over the network via an optional single-portormulti-portEthernet power supply. See “Setting up the Power Supply” on page 10 for more information.

Locally via an optional local power supply. See “Using the 3Com Local Power Supply” on page 12 for more information.

1

Installation Guide

About the Network Jack

The following diagram shows the front view of the Network Jack.

2

1

2 1

3

4

3

4

5

2

 

 

 

 

About the Network Jack

 

 

 

 

 

 

 

 

 

 

 

1

Switched ports

Allow up to four devices to be connected to

 

 

the network.

 

 

Port number 1 is also a power-forwardingport;

 

 

it can be used with any standard networking

 

 

device as well as to power a VoIP telephone on

 

 

a network that uses IEEE 802.3af-compatible

 

 

Power Over Ethernet.

 

 

 

 

 

2

Slot for adapter

Can be fitted with an adapter plate, which

 

plate

can be installed with up to two pass-through

 

 

ports.

 

 

 

 

 

3

Adapter plate

Can be used for voice or other networking

 

with installed

applications. The port bypasses the

 

pass-through

functionality of the switch, allowing you to

 

port connector

set up a connection to a separate network

 

 

segment or to connect to an analog or digital

 

 

PBX telephone.

 

 

The adapter plates are available from 3Com.

 

 

However, you must purchase the connectors

 

 

from the manufacturer. See “Installing the

 

 

Adapter Plate and Pass-ThroughPorts” on

 

 

page 15 for more information.

 

 

 

 

 

 

4

LEDs

 

 

 

 

 

 

 

 

Indicates network connection status.

 

 

 

 

Indicates power status.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

Power socket

Can be used to power the Network Jack with

 

 

a local power supply (available for purchase

 

 

from 3Com); required if your network does

 

 

not support Power Over Ethernet.

 

 

 

 

 

 

3

Installation Guide

The following diagram shows the back view of the Network Jack.

Net

 

 

 

 

 

wor

 

 

 

 

Mo

kInt

 

 

 

del3

erface

 

 

 

ASS

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Node

 

 

EMB

0

 

 

 

LEDI

 

 

 

 

 

N U.

 

 

 

 

 

S.A.

 

 

 

T

 

 

 

 

 

estedto

 

 

 

 

with

FCC

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omply

 

 

 

 

Stan

 

 

 

 

 

dards

 

C

 

 

 

 

 

 

 

US

4

2

1

3

4

 

 

 

About the Network Jack

 

 

 

 

 

 

 

 

 

1

Ethernet uplink

Connects the Network Jack to the network.

 

 

port

Make sure the port on the network switch

 

 

 

to which the Network Jack is connected is

 

 

 

configured as a standard MDI-Xport.

 

 

 

 

2

Slot for adapter

Can be fitted with an adapter plate, which can

 

 

plate

be installed with up to two pass-throughports.

 

 

 

 

3

Adapter plate

Connects the installed pass-throughport to

 

 

with installed

the network.

 

 

pass-through

 

 

 

 

port connector

 

 

 

 

 

 

4

Dip switches

Determine the type of Power Over Ethernet

 

 

 

(Capacitive Power Discovery Process 24V or

 

 

 

48V or IEEE 802.3af) the Network Jack uses.

Setting the dip switches is required only if your network supports Power Over Ethernet, or if you are using a multi-portEthernet power supply. See “Setting the Power Over Ethernet Dip Switches” on page 13 for instructions.

5

Installation Guide

Before You Begin

Before you begin installation, register your product at: www.3com.com/productreg.

The Network Jack is available in singleand 20-packs.Before you begin the installation, make sure you have the following items, which are included with the Network Jack:

6x32 screws (2 per Network Jack) for mounting the Network Jack to the wall or office cubicle.

RJ-45coupler cable (1 per Network Jack) for connecting the Ethernet cable from the network to the Network Jack (required only if your network cable is terminated with a femaleRJ-45connector).

Installation guide (1 per package).

Additionally, the following items are shipped with the single pack:

Adapter plates for installing connectors to use as passthrough ports. The adapter plates accommodate connectors from suppliers including:

Panduit (RJ-45andRJ-11)

Avaya (RJ-45andRJ-11)

NOTE: The connectors for the adapter plates must be purchased from the manufacturer. For a list of supported connectors, go to www.3com.com/.

Adapter plate screws (2) for mounting the adapter plate to the Network Jack.

6