NETGEAR EN308TC - 8 Port 10 Base-T Hub Bedienungsanleitung

Model EN308

Ethernet Hub Installation Guide

Start Here

Congratulations on your purchase of the NETGEAR

™

Model EN308

Ethernet hub This hub delivers standards-based, plug-and-play networking

solutions for small businesses, home ofﬁces, and low-density workgroups of

larger companies

Features

The Model EN308

hub has the following features:

• Eight 10BASE-T network ports (RJ-45) that provide 10 megabit per second

(Mbps) networking using simple unshielded twisted pair (UTP) wiring

• Coaxial BNC backbone support for connecting to an existing Ethernet

segment or external transceiver, or for network expansion by connecting

multiple hubs together using coaxial cabling

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

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

cables

• Front-panel 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

• Internal power adapter

• Limited ﬁve-year warranty

Start Here

Features

Model EN308

Ethernet Hub Installation Guide

Package Contents

Verify that your package contains the following:

• Model EN308

hub

• Mounting kit (for wall installation)

• BNC T-connector and BNC 50

Ω

terminator

• This installation guide

• Warranty & Owner Registration Card

• Support Information Card

• Power cord

9125FA

Power

cord

Mounting kit

Model EN308

hub

100M 10M

87654321

On = Link Blinking = Activity

Normal/Uplink

BNC

100-240 VAC, 50-60Hz 0.2A max.

OHM

BNC 50

terminator and

BNC T-connector

Installation guide,

Warranty & Owner

Registration Card,

and Support

Information Card

Package Contents

Model EN308

Ethernet Hub Installation Guide

Product Illustration

Front Panel

The front panel of the Model EN308

hub contains LEDs that monitor the

activity status of the hub

For ease of use, the front panel 10BASE-T LEDs that indicate link, receive, or

partition activity are duplicated on the 10BASE-T ports on the rear panel Use

the rear panel LEDs when setting up the device, and use the same LEDs on the

front panel for monitoring the ports when the hub is positioned in place and set

Front Panel LEDs

The table below describes the activity of the front panel LEDs

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.

10BASE-T

LEDs

Link/Receive

(For ports 1

through 8)

Green On The link between this port and the connected

port is good.

Blinking There is incoming data on the port.

Partition Amber On The port is partitioned because of excessive

collisions.

BNC LEDs

Rx Green Blinking There is incoming data on the BNC port.

Partition Green On The BNC port is partitioned because of

excessive collisions.

9117FA

PWR COL

1234

On=Link, Blinking=Receive

Partition

5678

EN308TC

MODEL

PORT

10 Mbps

Ethernet Hub

Partition

COL

(Collision)

LED

PWR

(Power)

LED

BNC Partition

LED

BNC Rx

LED

10BASE-T

LEDs

Product Illustration

Model EN308

Ethernet Hub Installation Guide

Rear Panel

The rear panel of the Model EN308

hub has eight RJ-45 10BASE-T ports, a

BNC port that you can use to connect to a backbone network or other PCs using

thin coaxial cable, and a Normal/Uplink push button

The rear panel also includes a DC power receptacle

RJ-45 10BASE-T Network Ports with Built-in LEDs

Two LEDs—the Link/Rx (Receive) LED and the Part (Partition) LED—are

built into each 10BASE-T port

The table below describes the activity of the LEDS

Label Color Activity Description

Link/Rx

(Located in the top

left corner of each

10BASE-T port)

Green On The link between this port and the connected

port is good.

Blinking There is incoming data on the port.

Part

(Located in the top

right corner of each

10BASE-T port)

Amber Blinking The port is partitioned because of excessive

collisions.

9118FA

BNC port Power receptacle

100M 10M

87654321

On = Link Blinking = Activity

Normal/Uplink

BNC

100-240 VAC, 50-60Hz 0.2A max.

Normal/Uplink

push button

10BASE-T

ports

8724EC

Link/Rx

(Receive)

LED

Part

(Partition)

LED

Model EN308

Ethernet Hub Installation Guide

Normal/Uplink Push Button for Port 8

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 another hub or to a switch through port 8 on the

Model EN308

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

Installation Procedures

1. Prepare the Site

Before you begin installing your Model EN308

hub, prepare the installation

site Make sure your operating environment meets the operating environment

requirements of the equipment

2. Install the Hub

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 Be 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.

Prepare the Site

Installation Procedures

Install the Hub

Model EN308

Ethernet Hub Installation Guide

3. Connect a PC to the Hub

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 8 on the Model EN308

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

Normal/Uplink

12345678

9126FA

Connect a PC to the Hub

Model EN308

Ethernet Hub Installation Guide

4. Connect the Hub to a Network

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 8, 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 8 on the Model EN308

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

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

Ports 1–7 Hub or switch Crossover cable

Connecting Port Connecting Device Cable Used

Port 8 set to Normal PC, server, or router Straight-through cable

Port 8 set to Uplink Hub or switch Straight-through cable

Connect the Hub to a Network

Model EN308

Ethernet Hub Installation Guide

Cascade the Hub Using the 10BASE-T Ports

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 Model EN308

hubs together

daisy-chain style Refer to the illustration for setting 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 (or ﬁve

paths)

100M 10M

87654321

On = Link Blinking = Activity

Normal/Uplink

BNC

100-240 VAC, 50-60Hz 0.2A max.

1234 56 78

Pwr

Col

EN108

10 BASE-T HUB

1234 56 78

Pwr

Col

EN108

10 BASE-T HUB

9122FA

Model EN104

hub Model EN104

hub

Model EN308TC hub

Model EN108

hub Model EN108

hub

Uplink

Normal

UplinkUplink

Uplink

100M 10M

87654321

On = Link Blinking = Activity

Normal/Uplink

BNC

100-240 VAC, 50-60Hz 0.2A max.

100M 10M

87654321

On = Link Blinking = Activity

Normal/Uplink

BNC

100-240 VAC, 50-60Hz 0.2A max.

100M 10M

87654321

On = Link Blinking = Activity

Normal/Uplink

BNC

100-240 VAC, 50-60Hz 0.2A max.

9123FA

Normal

Uplink

Model EN308

Ethernet Hub Installation Guide

Connect to a Network Using the BNC Port

The BNC port on the rear panel of the hub is used for connecting to a thin

coaxial segment You can connect other Model EN308

hubs, servers,

workstations, or other devices to the BNC port A BNC T- connector is inserted

in the port, and the BNC 50

Ω

terminator terminates the connection at each end

device By using the BNC port for cascading, you treat each connected hub as

just another node on the coaxial segment

The separation marks in the coaxial cable between the hubs in the following

illustration represent the incorporation of other devices and show that

interconnection is not limited to hubs

Note:

Ethernet speciﬁcations limit a BNC segment to 30 BNC

connections, specify a minimum of 1 64 feet (0 5 m) between any two

stations, and limit segments to 607 feet (185 m) in length

Normal/Uplink

12345678

Normal/Uplink

12345678

Normal/Uplink

12345678

9124FA

BNC 50 terminator

BNC T- connector

BNC 50 terminator

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