3Com 3CNJ100 - IntelliJack Switch User manual

NJ100 Network Jack
3CNJ100
4-port 10/100 Mbps Unmanaged
Ethernet Switch
Installation Guide
http://www.3com.com/
http://www.3com.com/productreg
09-2141-000
Published September 2001

3Com Corporation
■
5400 Bayfront Plaza
Santa Clara, California
■
95052-8145
■
U.S.A.
Copyright © 2001 3Com Corporation. All rights reserved. No part of this
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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-port Ethernet Power Supply 10
Using a Single-port Ethernet Power Supply 12
Using the 3Com Local Power Supply 12
Setting the Power Over Ethernet Dip Switches 13
Installing the Adapter Plate and Pass-Through Ports 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

Contents
Contacting Technical Support 28
One-Year Free 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

1
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-compatible Power Over Ethernet. Power Over
Ethernet, also known as in-line power, 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-port or multi-port
Ethernet 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.
Installation Guide

Installation Guide
2
About the Network Jack
The following diagram shows the front view of the Network Jack.
3
2
1
4
1
2
3
4
5

About the Network Jack
3
1 Switched ports Allow up to four devices to be connected to
the network.
Port number 1 is also a power-forwarding port;
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
plate
Can be fitted with an adapter plate, which
can be installed with up to two pass-through
ports.
3 Adapter plate
with installed
pass-through
port connector
Can be used for voice or other networking
applications. The port bypasses the
functionality of the switch, allowing you to
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-Through Ports” on
page 15 for more information.
4 LEDs
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.
Indicates network connection status.
Indicates power status.

Installation Guide
4
The following diagram shows the back view of the Network Jack.
CUS
NetworkInterfaceNode
Model3C3000
ASSEMBLEDINU.S.A.
TestedtoComply
with FCCStandards
1
3
2
4

About the Network Jack
5
1 Ethernet uplink
port
Connects the Network Jack to the network.
Make sure the port on the network switch
to which the Network Jack is connected is
configured as a standard MDI-X port.
2 Slot for adapter
plate
Can be fitted with an adapter plate, which can
be installed with up to two pass-through ports.
3 Adapter plate
with installed
pass-through
port connector
Connects the installed pass-through port to
the network.
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-port Ethernet power
supply. See “Setting the Power Over Ethernet
Dip Switches” on page 13 for instructions.

Installation Guide
6
Before You Begin
Before you begin installation, register your product at:
www.3com.com/productreg.
The Network Jack is available in single- and 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-45 coupler 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
female RJ-45 connector).
■ Installation guide (1 per package).
Additionally, the following items are shipped with the single pack:
■ Adapter plates for installing connectors to use as pass-
through ports. The adapter plates accommodate connectors
from suppliers including:
■
Panduit (RJ-45 and RJ-11)
■
Avaya (RJ-45 and RJ-11)
■ Adapter plate screws (2) for mounting the adapter plate to
the Network Jack.
NOTE: The connectors for the adapter plates must be
purchased from the manufacturer. For a list of supported
connectors, go to www.3com.com/.

Obtaining Optional Components
7
Obtaining Optional Components
The Network Jack works with the following optional components,
all of which are available from 3Com. Order online at
www.3com.com or by calling 1-877-949-3266.
Component Purpose 3C Number(s)
Adapter plates For installing pass-through port
connectors of your choice that allow
a direct connection to another
network segment or for connecting
an analog or digital PBX telephone.
3CNJAP-PA-20
3CNJAP-AV-20
Extension ring For ensuring that the Network Jack
is properly mounted to a cubicle;
required if the cubicle opening:
■
Has a depth of fewer than
1.5 inches.
■
Does not support the NEMA-
WD6 standard.
■
Does not have pre-drilled
screw holes for standard
mounting.
3CNJEXTRING
Single-port
Ethernet power
supply
For providing Power Over Ethernet
to locally power a single Network
Jack.
3CNJPSE
Multi-port
Ethernet power
supply
For providing Power Over Ethernet
to power up to 24 Network Jacks.
3CNJPSE24
3C10220
3C10222
Local power
supply
For locally powering a single
Network Jack; required if your
network does not support Power
Over Ethernet.
3CNJPSL

Installation Guide
8
Installing the Network Jack
Installing the Network Jack consists of the following steps:
1 Set up the power supply (page 10).
2 Set the Power Over Ethernet dip switches (page 13;
optional, required only if your network supports Power
Over Ethernet or if you are using a single-port or multi-port
power supply).
3 Install the adapter plate and pass-through ports (page 15;
optional).
4 Plan the installation (page 17).
5 Set up the network cabling at your site (page 19).
6 Connect the Network Jack to the network (page 19).
7 Mount the Network Jack to the wall or office cubicle
(page 22).
VoIP telephone
power cable
For powering a VoIP telephone on a
network that uses Capacitive Power
Discovery Process-compatible Power
Over Ethernet.
Check the 3Com
web site
Network Jack
Tester
For verifying the Network Jack
installation; useful if installing
multiple Network Jacks.
3CNJTESTER
Component Purpose 3C Number(s)

Installing the Network Jack
9
8 Connect the local power supply (page 23; optional) not
required if your network supports Power Over Ethernet or
if you are using a single-port or multi-port power supply).
9 Connect network devices to the Network Jack (page 23).
The following diagram displays an overview of the recommended
installation, where the Network Jack is being connected to an
Ethernet network cable that is terminated with a female RJ-45
connector. Detailed installation instructions are included in the
sections that follow.
3
2
1
4
RJ-45
coupler cable
Network
cable
To wiring
closet
Wall

Installation Guide
10
Setting up the Power Supply
Power to the Network Jack can be supplied one of the following ways:
■ Over the network via an integrated switch that supports
Power Over Ethernet.
■ Over the network via a multi-port Ethernet power supply.
■ Over the network via a single-port Ethernet power supply.
■ Locally via a 3Com local power supply.
Before you begin the installation, determine which type of
power supply the Network Jack will use.
Using an Integrated Switch with Power Over Ethernet
To use Power Over Ethernet, you must have a switch on the
network that has Power Over Ethernet integrated into it. You
must then determine if it is compatible with Capacitive Power
Discovery Process (24V or 48V) or IEEE 802.3af.
Using a Multi-port Ethernet Power Supply
To use a multi-port Ethernet power supply, you must connect the
power supply to your network, as shown in the illustration on
page 11.
NOTE: For a list of power supplies that support the
Network Jack, go to www.3com.com/.

Installing the Network Jack
11
The multi-port Ethernet power supply from 3Com connects
to an existing Ethernet or Fast Ethernet infrastructure with
standard Category 5 or Category 5e UTP cabling, and powers
up to 24 Network Jacks. See “Obtaining Optional Components”
on page 7 for ordering information. For complete installation
instructions, see the multi-port Ethernet power supply
documentation.
To
Network
Jack
To network
hub/switch
Wiring closet
3
2
1
4
3
2
1
4
Multi-port Ethernet
power supply
Network
switch

Installation Guide
12
Using a Single-port Ethernet Power Supply
To use a single-port power supply, connect the power supply to
the network hub or switch and to the Network Jack, as shown in
the following illustration. See “Obtaining Optional Components”
on page 7 for ordering information. For complete installation
instructions, see the single-port Ethernet power supply
documentation.
Using the 3Com Local Power Supply
To use the local power supply, make sure you have an electrical
outlet near the site where the Network Jack will be installed.
To
Network
Jack
Network
switch
To network
hub/switch
Wiring closet
To electrical
outlet
3
2
1
4
3
2
1
4

Installing the Network Jack
13
Setting the Power Over Ethernet Dip Switches
If your network switch or power supply supports Power Over
Ethernet, you must set the dip switches on the Network Jack
to the appropriate setting: Capacitive Power Discovery/24V,
Capacitive Power Discovery/48V, or IEEE 802.3af.
1 On the back of the Network Jack, remove the dip switch cover.
NOTE: If you are not using Power Over Ethernet to
power the Network Jack, skip this section. Go to
“Installing the Adapter Plate and Pass-Through Ports”
on page 15 to continue.
WARNING: Before setting the dip switches, make sure
that power to the Network Jack is off.
Do not change dip switches 1 and 2 from their factory
default settings (OFF). Changing these settings may
result in performance degradation.
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NetworkInterfaceNode
Model3C3000
ASSEMBLEDINU.S.A.
TestedtoComply
withFCCStandards
Dip switch cover

Installation Guide
14
2 Set the appropriate dip switches (labeled 3 and 4) for the
type of Power Over Ethernet supported. The default setting
is IEEE 802.3af-compatible Power Over Ethernet.
3 Replace the dip switch cover.
Power Over Ethernet Supported
Dip Switch
Numbers Setting
Capacitive Power Discovery/24V Ethernet
Power Source
4 (ON)
3 (ON)
Capacitive Power Discovery/48V Ethernet
Power Source
4 (ON)
3 (OFF)
IEEE 802.3af-compatible Power Over
Ethernet
4 (OFF)
3 (OFF)
4
3
2
1
ON
4
3
2
1
ON
4
3
2
1
ON

Installing the Network Jack
15
Installing the Adapter Plate and Pass-Through Ports
If you want to install the blank adapter plate, or if you want to
use pass-through ports for connecting an analog or PBX digital
telephone or for setting up a connection to a separate network
segment, purchase supported connectors and install them on
the appropriate Network Jack adapter plate (included with the
single pack; available for purchase separately with the 20-pack).
For a list of connectors that are supported with the Network Jack
adapter plates, go to www.3com.com.
1 Pull the network cable(s) from the wiring closet to the
location of the Network Jack.
NOTE: If you are not planning on installing the adapter
plate and pass-through ports, skip this section. Go to
“Planning the Installation” on page 17 to begin the
installation.

Installation Guide
16
2 Thread the network cable(s) through the empty slot on the
Network Jack.
3 Terminate the end of the network cable(s) with the
connector(s) you purchased separately.
Refer to the connector manufacturer’s instructions for
terminating the cable. Be sure to test end-to-end system
functionality and verify that it is working.
4 Snap the connector(s) into the appropriate adapter plate.
Each adapter plate is labeled with the name of a connector’s
manufacturer. Be sure to use the adapter plate that matches
the manufacturer of your connector(s).
5 Mount the adapter plate to the Network Jack using the two
adapter plate screws provided.
Wall
To wiring
closet