3Com IntelliJack NJ1000 Manuale utente

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.

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.

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

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.

Table 1

Feature Description

14 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.

2Two 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.

3Power LEDs:

PoE

Indicate whether the NJ1000 is being powered by a local power supply

(DC) or PoE.

4Uplink 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.

5Local 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.

6Locking screw hole Used to secure the NJ1000 to the wall-mount plate.

7Reset Button Press and release to restart the NJ1000.

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

1Two 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.

2Gigabit Ethernet

uplink port

Connects the NJ1000 to the network.

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

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.

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

■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

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.

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