3Com IntelliJack NJ105 User manual

NJ105 IntelliJack
3CNJ105
4-port 10/100 Mbps Unmanaged
Ethernet Switch
http://www.3com.com/
http://www.3com.com/productreg
Published July 2003
User guide version 1.0
User Guide

3Com Corporation n5500 Great America Pkwy n
Santa Clara, California n95052-8145 nU.S.A.
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About the NJ105 IntelliJack 1
Package Contents 2
NJ105 Description 4
Installing the IntelliJack 7
Setting up the Power Supply 7
Mounting the IntelliJack 8
Connecting Devices to the IntelliJack 10
Checking the LEDs 12
Specifications 13
Optional Components 17
Power Supplies and IP Phone Power Module 17
Mounting Plates and Spacers 18
Power Options 19
Using an Integrated Switch with Power Over Ethernet 20
Using Ethernet Multi-port Midspan Power Supply 21
Using a Single-port Ethernet Power Supply 23
Using the 3Com Local Power Supply 24
Installation Planning 27
Troubleshooting 29
Troubleshooting Matrix 30
One-Year Free Installation Support 33
Online Technical Services 33
Contents

Contents
Technical Support 33
Support from Your Network Supplier 35
Support from 3Com 36
Returning Products for Repair 36
3Com Corporation Limited Warranty 37
Limited Warranty and Regulatory Compliance
Information

1
The 3Com NJ105 is part of the IntelliJack family of products that
provides connectivity at the edge of the network infrastructure.
The NJ105 IntelliJack is a 4-port, un-managed Fast Ethernet
switch that fits into most standard data port openings.
The NJ105 IntelliJack quadruples port connections where a single
port (and cable) already exists in the wall. Expanding port
connections with the 3Com IntelliJack is a less expensive and less
disruptive alternative to running additional cabling. Also, the
3Com IntelliJack is installed in the wall, making it more secure
and out of the way than deploying a remote desktop switch.
The NJ105 IntelliJack allows up to four networking devices, such
as computers, printers, Voice over IP (VoIP) telephones, and
scanners, to be connected to the network via its own Ethernet
port. A pass-through port is provided that allows an additional
device to be connected to a separate network segment through
the same IntelliJack.
All ports feature 10/100 Mbps auto-negotiation, which
configures the NJ105 IntelliJack for 10 Mbps or 100 Mbps
connections automatically.
Before you begin installation, register your product at:
www.3com.com/support.
1About the NJ105 IntelliJack

About the NJ105 IntelliJack
2
Package Contents
The NJ105 IntelliJack is available in single- and 20-packs. Before
installation, familiarize yourself with the following items, which
are included with the NJ105:
1NJ105 IntelliJack.
2Four pairs of M3.5 x 25mm screws (two per IntelliJack) for
mounting the IntelliJack to the wall, floor box or office cubicle.
3Mounting plate (face plate).
4Spacer for optional use with some after-market face plates.

Package Contents
3
All screws are phillips pan head type screws. The type of threads
vary to match the different mounting locations compatible with
the IntelliJack.
■Thread forming screws for mounting into plastic:
■M3 x 30mm (2x)
■M3 x 40mm (2x)
■Machine screws for mounting into metal:
■M3.5 x 30mm (2x)
■M3.5 x 40mm (2x)
For more information on optional components, see Appendix B,
“Optional Components”.

About the NJ105 IntelliJack
4
NJ105 Description
The following diagram shows the front, rear and bottom views
of the IntelliJack:
1RJ-45 switched
PAN (personal
area network)
ports
Four 10/100 Mbps auto-negotiation ports,
which the NJ105 configures for 10 Mbps or
100 Mbps connections automatically (green
LEDs).
2Port LEDs and
corresponding
port numbers
Indicate network status of each of the four
RJ-45 PAN ports.
3LAN LED Indicates the status of the LAN connection
(white cable, green LED). For more
information, see “Checking the LEDs” on
page 12.

NJ105 Description
5
4Power LED Indicates NJ105 power status (green). For
more information, see “Checking the LEDs”
on page 12.
5Pass-through
port
Provides a link to your LAN that passes
through the NJ105 IntelliJack. The data or
voice traffic is separate from and unaffected
by the NJ105 switch.
6Power-
forwarding LED
Lights when the IntelliJack is connected to—
and forwarding power to—an IEEE 802.3af-
compliant device. For more information, see
“Checking the LEDs” on page 12.
7Local power
supply cable
strain relief
Local power supply cable strain relief.
8Power socket The NJ105 can be powered from a local
power supply (available for purchase from
3Com). This is required if your network does
not support Power Over Ethernet (PoE).
9Pass-through
LAN cable
Connects directly to your LAN (located on the
front of the NJ105.) Black cable, no LED.
10 Uplink port Connects the NJ105 switched RJ-45ports to
the Ethernet LAN. Make sure the port on the
network switch to which the NJ105 is
connected is configured as a standard MDI-X
port.

About the NJ105 IntelliJack
6