NETGEAR EN104 - Hub - EN Manuale utente

Model EN104/EN108/EN116 Ethernet Hub Installation Guide

Congratulations on your purchase of the NETGEAR

™

Model EN104, Model

EN108, or Model EN116 Ethernet hub. The hubs deliver standards-based, plug-

and-play networking solutions for small businesses, home ofﬁces, and low-

density workgroups of larger companies.

In this installation guide, all three hubs are referred to collectively as the Model

EN104/EN108/EN116 hub. Each hub is listed individually when information is

provided that refers to a speciﬁc model.

The Model EN104/EN108/EN116 hub has the following features:

• Four (on the Model EN104 hub), eight (on the Model EN108 hub), and

sixteen (on the

Model EN116 hub)

vista 10BASE-T network ports (RJ-45) that

provide 10 megabit per second (Mbps) networking using simple unshielded

twisted pair (UTP) wiring

• Built-in LED indicators for at-a-glance status checks by vista networks

ports

• AUI (not on the Model EN104 hub) or coaxial BNC backbone support for

connecting to an existing Ethernet segment or external transceiver, or for

network expansion by connecting multiple hubs together using twisted pair

or coaxial cabling

• Uplink port for connecting to other hubs using simple straight-through

cables

• Clear front-panel light-emitting diode (LED) indicators to monitor overall

hub status

• Plug-and-play installation with no software to conﬁgure

• Complete hub functions including packet retiming, collision detection,

preamble regeneration, and fragment extension

• Automatic partitioning and reconnection of a port that has excessive

collisions or is jabbering

• Automatic polarity detection for recognizing and correcting incorrect

polarity on the receive pair

• Compact design, enabling easy tabletop or rack-mounting installation

• External power adapter

• Limited lifetime warranty on the unit and three-year warranty on the power

supply

Start Here

Features

Model EN104/EN108/EN116 Ethernet Hub Installation Guide

Verify that your package contains the following:

• Model EN104 hub, Model EN108 hub, or Model EN116 hub

• Mounting kit (for wall installation)

• BNC T-connector and BNC 50

Ω

terminator (only if you have purchased the

Model EN108 hub or the Model EN116 hub)

• This installation guide

• Warranty & Owner Registration Card

• Support Information Card

• Power adapter

Package Contents

8731FA

Power

adapter

Mounting kit

Model EN116 hub

Model EN104 hub Model EN108 hub

Pwr

Col

EN104

10 BASE-T HUB

LINK Rx

1234 56 78

Pwr

Col

EN108

10 BASE-T HUB

LINK Rx

1234 56 78

Pwr

Col

EN116

10 BASE-T HUB

1234 56 78

LINK Rx

Installation guide,

Warranty & Owner

Registration Card,

Support Information

Card

Model EN104/EN108/EN116 Ethernet Hub Installation Guide

Vista 10BASE-T Network Ports with Built-in LEDs

The front panel of the Model EN104 hub has four RJ-45 10BASE-T ports, the

Model EN108 hub has eight RJ-45 10BASE-T ports, and the Model EN116 hub

has sixteen RJ-45 10BASE-T ports. Two LEDs—the Link LED and the Rx

LED—are built into each 10BASE-T port.

Product Illustration

8732FA

Front Panel of the Model EN104 hub

Front Panel of the Model EN108 hub

Front Panel of the Model EN116 hub

Pwr

Col

EN104

10 BASE-T HUB LINK Rx

1234 56 78

Pwr

Col

EN108

10 BASE-T HUB

LINK Rx

1234 56 78

Pwr

Col

EN116

10 BASE-T HUB

1234 56 78

LINK Rx

10BASE-T ports

Pwr (Power) Normal/Uplink

push button

Col (Collision)

8724EA

Link

LED Rx

LED

Model EN104/EN108/EN116 Ethernet Hub Installation Guide

LEDs

The table below describes the activity of the LEDs.

Normal/Uplink Push Button

The Normal/Uplink push button allows you to select Normal (MDI-X) wiring

for direct PC connection. The push button also allows you to select Uplink

(MDI) wiring for connection to a hub or a switch through port 4 on the

Model

EN104 hub, port 8 on the

Model EN108 hub, or port 16 on the Model EN116 hub.

This uplink conﬁguration eliminates the need to use a crossover cable. The other

10BASE-T ports are permanently conﬁgured for normal wiring for connection

to a PC.

Label Color Activity Description

Pwr (Power) Green On Power is supplied to the hub.

Col (Collision) Amber Blinking Data collision is occurring on the

network. Note that occasional

collisions are normal.

Link

(located on the top left

corner of each vista

10BASE-T port)

Green On The link between this port and the

connected device is good.

(located on the top right

corner of each vista

10BASE-T port)

Green Blinking There is incoming data on the port.

Active

(for BNC) Green On The link between the BNC port and the

connected device is good.

(for BNC) Green Blinking There is incoming data on the BNC

port.

Active

(for AUI) Green On The link between the AUI port and the

connected device is good.

(for AUI) Green Blinking There is incoming data on the AUI port.

Model EN104/EN108/EN116 Ethernet Hub Installation Guide

Rear Panel

The rear panel of the hub has a BNC port that you can use to connect to a

backbone network or other PCs using thin coaxial cable.

The rear panel of the Model EN108 hub and the Model EN116 hub also has an

AUI port in addition to the BNC port. You can use the AUI port with the

appropriate transceiver to connect the hub to a backbone network using thin

coaxial cable, thick coaxial cable, ﬁber optic cable, or 10BASE-T wiring.

The rear panel also includes a DC power receptacle.

AUI BNC

Active 12Vdc 1.2A

Active

— +

BNC

Active 12Vdc 1.2A

— +

8738FA

AUI port

Rear Panel of the Model EN104 hub

Rear Panel of the Model EN108 hub

Rear Panel of the Model EN116 hub

AUI port LEDs

BNC port

BNC port LEDs

Power receptacle

AUI BNC 12Vdc 1.2A

— +

Active

Model EN104/EN108/EN116 Ethernet Hub Installation Guide

Before you begin installing your hub, prepare the installation site. Make sure

your operating environment meets the operating environment requirements of

the equipment.

To install your hub on a ﬂat surface, you do not need any special tools. Be sure the hub is

positioned with at least 2 inches of space on all sides for ventilation.

To install the hub on a wall, measure the distance between the mounting holes on the back of the

hub and mark the wall to match the location of the mounting holes on the hub. At the marked

location, screw into the wall the two screws that you received with the mounting kit included in

your package contents. B

e sure to choose a location that is near the devices to be

connected, is close to an electrical outlet, and provides at least 2 inches of space

all around the hub for ventilation.

Characteristic Requirement

Temperature Ambient temperature between 0

and 40

C (32

and 104

F).

No nearby heat sources such as direct sunlight, warm air

exhausts, or heaters.

Operating humidity Maximum relative humidity of 90%, noncondensing.

Ventilation Minimum 2 inches (5.08 cm) on all sides for cooling.

Adequate airﬂow in room or wiring closet.

Operating conditions At least 6 feet (1.83 m) to nearest source of electromagnetic

noise (such as photocopy machine or arc welder).

Service access Minimum 12 inches (19.68 cm) front and back for service

access and maintenance.Front and back clearance for cables

and wiring hardware such as punchdown blocks.

Power Adequate power source within 6 feet (1.83 m).

Wiring hardware Wiring hardware, such as punchdown blocks or patch panels,

should be complete before installing the hub.

Installation Procedures

Prepare the Site

Install the Hub

Model EN104/EN108/EN116 Ethernet Hub Installation Guide

You can connect PCs, Apple Macintosh computers, UNIX workstations, or any

device equipped with a 10BASE-T Ethernet interface to the RJ-45 ports on your

hub by using twisted pair Ethernet cables.

To connect any of the RJ-45 ports on your hub to a PC, use a regular straight-

through UTP cable. If you are connecting using port 4 on the Model EN104 hub,

port 8 on the Model EN108 hub, or port 16 on the Model EN116 hub, set the

Normal/Uplink push button to Normal.

Note:

Ethernet speciﬁcations limit the cable length between your PC

or server and the hub to 328 feet (100 meters) in length.

Connect a PC to the Hub

Normal/Uplink

1234

Pwr

Col5678

8734FA

(The Model EN108 hub is

shown in the illustration.)

Model EN104/EN108/EN116 Ethernet Hub Installation Guide

Cascading refers to connecting hubs together to increase the number of ports or

the number of users supported on the network. The 10BASE-T ports can be used

to cascade hubs together.

The twisted pair cable extended from a 10BASE-T port (or UTP port) is called a

twisted pair segment and can be up to 100 meters (m) in length. The 10BASE-T

ports, with the exception of port 4 on the Model EN104 hub, port 8 on the

Model EN108 hub, or port 16 on the Model EN116 hub, are MDI-X (or Normal)

ports. Use the following table as a guide for selecting the appropriate network

cable.

Set the Normal/Uplink Push Button

If you are connecting to port 4 on the Model EN104 hub, port 8 on

the Model EN108 hub, or port 16 on the Model EN116 hub, use the following

table. Determine the type of cable to use and how to set

the Normal/Uplink push button.

Connecting Port

on the Hub Connecting Device Cable Used

Model EN104 hub:

Ports 1–3 PC, server, or router Straight-through cable

Ports 1–3 Hub or switch Crossover cable

Model EN108 hub:

Ports 1–7 PC, server, or router Straight-through cable

Ports 1–7 Hub or switch Crossover cable

Model EN116 hub:

Ports 1–15 PC, server, or router Straight-through cable

Ports 1–15 Hub or switch Crossover cable

Connecting Port Connecting Device Cable Used

Port 4, port 8, or port 16 set to

Normal PC, server, or router Straight-through cable

Port 4, port 8, or port 16 set to

Uplink Hub or switch Straight-through cable

Connect the Hub to a Network

Model EN104/EN108/EN116 Ethernet Hub Installation Guide

Cascade the Hub

The following illustration shows cascading hubs together in a hierarchical star

through the 10BASE-T ports and indicates the setting of the Normal/Uplink

push button on each hub.

The following illustration shows cascading hubs together daisy-chain style and

indicates the setting of the Normal/Uplink push button on each hub.

Note:

Ethernet speciﬁcations limit the number of hubs with twisted

pair links in any communication path to ﬁve, as shown in the example.

When PC “A”communicates with PC “B,”the communication path

goes from hub 4 to hub 2, to hub 1, to hub 3, and then to hub 5.

1234 56 78

Pwr

Col

EN116

10 BASE-T HUB

1234 56 78

LINK Rx

1234 56 78

Pwr

Col

EN108

10 BASE-T HUB

1234 56 78

Pwr

Col

EN108

10 BASE-T HUB

8735FA

Hub 2

Hub 4 Hub 5

Hub 1

Hub 3

Uplink

Normal

UplinkUplink

Uplink

Pwr

Col

EN104

10 BASE-T HUB

LINK Rx

1234 56 78

Pwr

Col

EN108

10 BASE-T HUB

LINK Rx

1234 56 78

Pwr

Col

EN116

10 BASE-T HUB

1234 56 78

LINK Rx

8733FA

Model EN108 hub

Model EN116 hub

Model EN104 hub

Uplink

Normal

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