PDF User Manual

Quick Start Guide

3Com

®

 IntelliJack

®

 Gigabit Switch 

NJ1000

3CNJ1000

Part Number: 10016679 Rev AB

Published: June 2008

The 3Com

®

 IntelliJack Gigabit Switch NJ1000 (3CNJ1000) is a 5-port, unmanaged gigabit 

Ethernet switch that fits into most standard electrical wall outlets or data port openings. 
The NJ1000 can also be mounted on the desktop using the optional desk stand, 
3CNJ1000STAND.

Throughout this guide, the 3Com

®

 IntelliJack Gigabit Switch NJ1000 (3CNJ1000) is 

referred to as the NJ1000. This Quick Start Guide describes the basic steps necessary to 
install and configure your NJ1000. 

Copyright © 2008 3Com Corporation. All Rights Reserved. 

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and 
may be registered in other countries. 3Com, the 3Com logo, and IntelliJack are registered 
trademarks of 3Com Corporation.

2

About This Guide

■

Overview of the NJ1000 and Its Features

■

NJ1000 Basics

■

Observe All Safety Precautions

■

Check the Shipment

■

Register Your Product

■

Telephone Technical Support and Repair

■

Installation Overview

■

1. Understand the Power Options 

■

2. Understand the PoE Capabilities for Port 1 and Port 2

■

3. Plan the Installation

■

4. Attach the Wall-Mount Bracket

■

5. Set Up the Network Cabling

■

6. Connect the NJ1000 to the Network

■

7. Mount the NJ1000 to the Wall

■

8. Connect the Local Power Supply (Optional) 

■

9. Connect Devices to the NJ1000

■

10. Troubleshooting: Check the LEDs

■

Regulatory Statements

Overview of the NJ1000 and Its Features

The front of the NJ1000 has four gigabit LAN ports for local switching. The gigabit 
LAN uplink port on the rear connects it to the rest of the network. 

The NJ1000 brings gigabit switching capabilities to any single port on an Ethernet 
network by allowing connections for up to four networking devices such as 

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computers, servers, access points, IP cameras, and Voice Over IP (VoIP) telephones to 
the network through a single Ethernet connection. 

All 5 LAN ports feature 10/100/1000 Mbps with auto-negotiation and auto MDI-X. 
The NJ1000 also provides two pass-through ports that can be used to connect two 
additional devices to separate network segments through the same unit. 

Power is provided to the NJ1000 either through the uplink port via 802.3at or 
802.3af PoE (Power over Ethernet) or locally via an optional, external 48V DC power 
supply, 3CNJ1000PSL.

NOTE: 

Power Over Ethernet (PoE) is a method for providing power to equipment over 

an Ethernet cable, allowing a device to receive both data and power from the same 
network cable. PoE power may be provided on port 1 or port 2 of the NJ1000 if there 
is sufficient power available to the system. See the section “Understand the PoE 
Capabilities for Port 1 and Port 2” later in this guide for details.

NJ1000 Basics

This diagram shows the front and side views of the NJ1000. Table 1 on page 4 
describes the features.

4

Table 1   

Feature

Description

1

4 Gigabit LAN 
switch ports 
with LEDs

Allows you to connect up to four devices to the network. 
A green LED indicates connection status when a device is using a 
particular port. 
Port 1 and port 2 are also power-forwarding ports; they can be used 
with any standard networking device as well as to power any device 
that requires IEEE 802.3af-compatible PoE. 
An additional LED indicates when the port is forwarding power to a 
device connected to that port.

2

Two pass-through 
ports

The pass-through ports bypass the functionality of the switch and are 
directly wired to the associated pass-through ports on the rear of the 
unit. Pass-through ports allow connection to a separate network 
segment or connection of an analog or digital PBX telephone.

3

Power LEDs:
DC
PoE

Indicate whether the NJ1000 is being powered by a local power supply 
(DC) or PoE.

4

Uplink LED

Indicates network connection status for the uplink port on the rear of 
the unit. 
A green LED indicates a valid connection for the uplink port.

5

Local Power Socket

Can be used to power the NJ1000 with the optional local power 
supply, 3CNJ1000PSL. 

NOTE: 

This power supply is required if the local 

network does not supply Power over Ethernet.

6

Locking screw hole

Used to secure the NJ1000 to the wall-mount plate.

7

Reset Button

Press and release to restart the NJ1000.

5

This diagram shows the rear view of the NJ1000. Table 2 on page 5 describes the 
features.

Observe All Safety Precautions

This equipment must be installed in compliance with local and national building 
codes, regulatory restrictions, and FCC rules. See the section “Regulatory Notices” at 

Table 2   

Feature

Description

1

Two Pass-through 
ports

The pass-through ports bypass the functionality of the switch and are 
directly wired to the associated pass-through ports on the front of the 
unit. Pass-through ports allow connection to a separate network 
segment or connection of an analog or digital PBX telephone.

2

Gigabit Ethernet 
uplink port

Connects the NJ1000 to the network.

6

the end of this guide. For the safety of people and equipment, only professional 
network personnel should install the NJ1000.

Check the Shipment

The NJ1000 is available in single- and 20-unit packs. Make sure that you have the 
following items, which are included with each NJ1000:

■

NJ1000

■

Screw kit for wall mounting the NJ1000

■

Male-to-male RJ-45 coupler cable (2 per NJ1000) for connecting the Ethernet 
cable from the network to the NJ1000. 

NOTE: 

For use only if the network cable 

is terminated with a female RJ-45 connector.

The following optional items in Table 3 may be useful, depending on your specific 
installation requirements and the PoE capability of your network. If you choose to use 
any of these items, be sure that they are on hand before you begin the installation.

WARNING:

  To avoid possible injury or damage to equipment, you must 

use power supply equipment that is safety certified according to UL, CSA, 
IEC, or other applicable national or international safety requirements for the 
country of use. All references to power supply in this document refer to 
equipment meeting these requirements.

Table 3   

Part Number

Description

Purpose and 3C (Ordering) Numbers

3CNJ1000PSE

Optional mid-span 
power injector

For providing 802.3at PoE to an NJ1000

3CNJ1000PSL

Optional local power 
supply

For locally powering a single NJ1000

NOTE:

 This item is required if the network does not 

support Power over Ethernet.

3CNJ1000STAND

Optional desk stand

For mounting the NJ1000 on the desktop

7

Register Your Product

To obtain telephone support as part of your warranty and other service benefits, you 
must first register your product at:

http://eSupport.3com.com/

Telephone Technical Support and Repair

3Com offers telephone, e-mail, and Internet access to technical support and repair 
services. To access these services for your region, use the appropriate telephone 
number, URL or e-mail address from the following URL:

http://csoweb4.3com.com/contactus/

Installation Overview for the NJ1000

Detailed installation instructions are included in the sections that follow.

The following diagram displays an overview of the recommended installation. In this 
example, the NJ1000 is being connected to an Ethernet network cable that is 
terminated with a female RJ-45 connector. 

8

1. Understand the Power Options

Power to the NJ1000 can be supplied through either PoE (either 802.3at or 802.3af) 
applied to the uplink port or through the optional local external power supply.

If power is supplied to the uplink port by 802.3at or by the external power supply, 
then ports 1 and 2 may act as PoE PSE (Power Source Equipment) and may also 
provide power to other devices plugged into those ports. If power is supplied by 
802.3af, then port 1 and 2 will not be able to supply PoE power. Refer to Table 4 for a 
summary of this information.

2. Understand the PoE Capabilities for Port 1 and Port 2

If power is supplied by 802.3at through the uplink port (PD) or if power is supplied 
through the external power supply, then ports 1 and 2 may in turn act as PoE PSE and 
may provide power. 

If power is provided to the NJ1000 by the uplink port (PD) with 802.3at PoE or with 
the external power supply, then the NJ1000 will have a total PoE PSE budget of 
15.4W, which can be divided between port 1 and port 2 based on the class-based 
power management feature. 

The NJ1000 can power these combinations of devices:

■

One Class 0,3 PD device or

■

Two Class 2 PD devices or

■

Two Class 1 PD devices or

Table 4   

Input Power

PoE Forwarding on Ports 1 and 2?

802.3at

Yes

Local External Power Yes

802.3af

No

9

■

One Class 1 PD device and One Class 2 PD device

CAUTION: 

You must use only a power supply that is provided or approved by 3Com 

for use with this NJ1000. Failure to comply with this requirement may result in 
damage to the NJ1000, or may result in a hazardous situation or personal injury.

3. Plan the Installation

When installed, the back of the NJ1000 extends into a wall for 0.5 inches. Because 
the depth of some wall openings differs, observe the following requirements and 
recommendations before you install the NJ1000:

■

Make sure that the wall opening where the NJ1000 is being installed complies 
with the NEMA-WD6 standard, as described in this diagram:

■

Make sure that the distance between the back of the NJ1000 and the inside of 
the wall is at least 1.5 inches (3 inches is recommended).

1.750”

(44.45mm)

2.8125”

(71.44 mm)

3.28125”

(83.31mm)

Screw holes

reference

10

NOTE: 

If you are installing the NJ1000 into a wall junction box, make sure that there 

is enough space between the back of the NJ1000 and the inside of the junction box 
to maintain an acceptable bend radius on the cable. 

■

To ensure proper horizontal cabling functionality, adhere to the following 
network cabling standards during installation:

■

ANSI/TIA/EIA-568 

Commercial Building Telecommunications Cabling Standard

■

ANSI/TIA/EIA-569

Commercial Building Standard for Telecommunications Pathways and Spaces

4. Attach the Wall-Mount Bracket

Attach the included wall-mount bracket to the wall opening as shown in this 
diagram.

11

5. Set Up the Network Cabling

The network cabling (from the wiring closet to the wall opening) may already be 
installed. If it is not, install the cabling following these general guidelines.

CAUTION:

 3Com recommends that a professional cable installer perform these 

procedures. Be sure to adhere to local safety and regulatory codes during the cable 
installation.

1

Connect one end of an Ethernet cable to the network. Usually, this 
connection is made in a network wiring closet, via the patch panel.

2

Terminate the other end of the cable at the location where the 
NJ1000 is being installed (using either a female or male RJ-45 
connector). Refer to the connector manufacturer's instructions for 
terminating the cable. Be sure to test the connector and verify that it 
is working.

6. Connect the NJ1000 to the Network

The method for connecting the NJ1000 to the network is determined by how the 
network cable is terminated, as described in step

5

.

■

If the end of the cable is terminated with a female RJ-45 connector, use one of 
the RJ-45 coupler cables included in the NJ1000 package to connect the NJ1000 
to the network cable.

12

■

If the end of the cable is terminated with a male connector, connect the network 
cable directly into the Ethernet uplink port.

7. Mount the NJ1000 to the Wall

After you connect the NJ1000 to the network, follow these steps, as shown in the 
next figure:

1

Mount the NJ1000 to the wall-mount bracket. 

CAUTION:

 Make sure that the vents along the edges of the NJ1000 faceplate are 

clear of any obstructions to allow airflow to vents.

2

Slide the NJ1000 onto the wall-mount bracket, ensuring that the four 
hooks on the bracket fit into the four slots on the back of the 
NJ1000. 

13

3

Pull the NJ1000 down to lock the hooks tightly into the slots. Be sure 
to match the screwholes in the bracket and the NJ1000. Secure the 
NJ1000 using the T-10 torx screw that came in the NJ1000 package

8. Connect the Local Power Supply (Optional)

If the network does not support PoE, you can use the optional local power supply. To 
connect the local power supply to the NJ1000, follow these steps:

1

Connect the round connector of the local power supply to the 
NJ1000 (as shown in the next diagram).

2

Plug the power cord of the local power supply into an AC outlet.

WARNING: 

Use 

only

 the local power supply available from 3Com. Failure to do so 

may result in damage to the NJ1000 or may result in a hazardous situation.

14

9. Connect Devices to the NJ1000

Now you may connect networking devices such as computers, servers, access points, 
IP cameras, and Voice Over IP (VoIP) telephones to any of the four LAN ports on the 
front of the NJ1000. Remember, if power is supplied to the NJ1000 by 802.3at or via 
the local, external power supply, then PoE PSE power will be available on ports 1 and 
2.

10. Troubleshooting: Check the LEDs

Verify the NJ1000 installation by checking the LEDs according to this table:

Table 5   

LED

Description

LAN

On — A device is connected to the NJ1000 and a link has been established.
Off — There is no connection to the NJ1000.

Port 1 and Port 2 
PoE

On — 802.3af PoE is being supplied.
Off — No PoE is being supplied.

15

Uplink

On — The unit is connected to the network and a link has been established.
Off — There is no connection to the network.

PoE Power LED

On — The unit is receiving power via PoE from the network.
Green — Power is supplied via 802.3at
Amber — Power is supplied via 802.3af
Off — The NJ1000 is not receiving PoE power.

DC Power LED

On — The unit is receiving power via the optional local DC power supply, 
3CN1000JPSL.
Off — The NJ1000 is not receiving local DC power.

Table 5   

16