3COM 3CNJ90 User Manual

NJ90
Network Jack

User Guide

3CNJ90

User Guide

NJ90 Network Jack

3CNJ90
4-port 10/100 Mbps Unmanaged
Ethernet Switch

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

150000038600A R01
Published February 2003

3Com Corporation 5500 Great America Parkway
Santa Clara, California 95052-8145 U.S.A.

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© 2003 3Com Corporation. All rights reserved. No part of

Table of Contents

Contents

1. NJ90 Package Contents 1

2. NJ90 Description 2

3. NJ90 Installation 3

Appendix

A: NJ90 Specifications 5
B: Wall Outlet Dimensions 7
C: Setting up the Power Supply 8
D: Setting up the Network Cabling at Your Site 12
E: Troubleshooting the NJ90 13
F: Contacting Technical Support 14

Limited Warranty & Regulatory Compliance Information 17

List of Illustrations

Fig.1 NJ90 Feature Description 2
Fig.2 NJ90 Installation 3
Fig.3 NJ90 Dimensions 5
Fig.4 Wall Outlet (NEMA-WD6) Dimensions 7
Fig.5 Using an Integrated Switch with Power over Ethernet 8
Fig.6 Using a Multi-port Ethernet Power Supply 9
Fig.7 Using a Single-port Ethernet Power Supply 10
Fig.8 Using the 3Com Local Power Supply 10

NJ90 User Guide

The 3Com Network Jack is a platform that provides connectivity at
the edge of the network infrastructure. The NJ90 Network Jack, is a
member of this family of products.

The NJ90 Network Jack is a 4-port, un-managed Fast Ethernet switch
that fits into most standard data port openings.

The NJ90 Network Jack quadruples port connections where a single
port (and cable) already exists in the wall. Expanding port connec­tions with the 3Com Network Jack is a less expensive and less dis­ruptive alternative to running additional cabling. Also, the 3Com
Network Jack is installed in the wall, making it more secure and out
of the way than deploying a remote desktop switch.

The NJ90 Network Jack allows up to four networking devices, such as
computers, printers, Voice over IP (VoIP) telephones, and scanners,
each to be connected to the network via its own Ethernet port.

The NJ90 needs no software to operate and no configuration. All
ports feature 10/100 Mbps auto-negotiation, which configures the
NJ90 Network Jack for 10 Mbps or 100 Mbps connections automati­cally.

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

1. NJ90 Package Contents

- Single Pack & Multi Pack

The NJ90 Network Jack is available in single and 20-packs. Before
you begin the installation, make sure you familiarize yourself with
the following items, which are included with the NJ90:

•NJ90 Unit

• 6x32 screws (2 per NJ90) for mounting the NJ90 to the wall or
office cubicle

• RJ-45 Male-to-Male coupler cable (1 per NJ90) for connecting
the NJ90 unit to the Network Ethernet cable (required only in
case your network cable is terminated with a female RJ-45 con­nector)

• User Guide (1 per package)

1

Installation Guide

2. NJ90 Description

The following diagram shows the front view and the rear view of the
NJ90 (see descriptions below)

3

1

5

2

6

Figure 1 - NJ90 Feature Description

4

1 Four Switching Ports Allow up to four devices to be

2 LED’s Indicates network connection

connected to the network.

and activity status.
Indicates NJ90 power status.

3 Uplink Port Connects NJ90 to the Network cable
4 Hook Secure the Coupler Cable with a tie-

5 Power socket NJ90 can be powered from a local

6 Strain Relief Channel Strain Relief Channel for the Local

wrap

power supply (available for purchase
separately from 3Com)

Power Cord

2

3. NJ90 Installation

3.1 Install the NJ90 Network Jack.

3.2 Set up the power supply

3.1 - Install the NJ90 Network Jack

3. NJ90 Installation

RJ-45
coupler cable

Wall

Network
cable

To wiring
closet

Network
cable

Wall

To wiring
closet

Figure 2 - NJ90 Installation

Step 1:

If the end of the network cable from the wiring closet is terminated
with a female RJ-45 connector, use the RJ-45 coupler cable included
in the package to connect the Network jack to the network cable
(recommended installation).

or

If the end of the network cable from the wiring closet is terminated
with a male RJ-45 connector, connect the network cable directly into
the NJ90 uplink port.

Step 2: (Optional)

Thread a tie-wrap around the hook at the back and secure the RJ-45
coupler cable/Network cable.

3