3Com TP1200 - OfficeConnect Hub Panduan Pengguna - Halaman 5

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Connecting to 10BASE-T Networks

Your OfficeConnect Hub can be connected to a

10BASE-T network through an OfficeConnect switch

(for example, an OfficeConnect Switch 140). Refer to the

accompanying OfficeConnect Product Range sheet.

Powering Up and Checking Connections

When you have connected your hubs, power them on.

The Port Status LEDs for the ports you have used should

be green. If they are not, check your connections.

The OfficeConnect hub has been designed to aid you

when detecting and solving possible problems with your

network. These problems are rarely serious — the cause

is usually a disconnected or damaged cable, or incorrect

configuration. If this section does not solve your

problem, contact your supplier for information on what

to do next.

Perform these actions first:

Ensure all equipment is powered on.

Power each hub off, wait about 5 seconds and then

power them on.

Check the following symptoms and solutions:

Power LED not lit. Check your power adapter

connection. If there is still no power, you may have a

faulty power adapter which needs replacing with

another OfficeConnect power adapter. Do not use any

other power adapter with the hub.

Alert LED continuously lit. There is either continual

excessive use of your network (over 80%) or, more likely,

a port has partitioned due to a loop in your network

(in which case the corresponding Port Status LED will be

yellow). Examine your connections and remove the

loop. Each piece of equipment needs only one

connection to your OfficeConnect hub.

Port Status LED not lit for a port that has a

connection. There is a problem with this particular

connection. Check that the equipment connected to

the hub is powered on, operating correctly, and

contains a 100BASE-TX connection. The hub can be

directly connected only to equipment that can

provide a 100Mbps connection (not 10Mbps only).

In particular, ensure that:

You are using a 100Mbps adapter in your workstation,

if connecting a workstation to the hub. If your adapter

can operate at various speeds, ensure that it is set to

operate at 100Mbps.

Any 10Mbps equipment that you want to link to the

hub, is connected through a 10/100 hub or switch.

ROBLEM

OLVING

Spot Checks

At frequent intervals, visually check that:

The Alert LED is not lit — this is the best way to find out

if there are problems with your network

Case vents are not obstructed

Cabling is secure and not pulled taut

You are using a 'Straight-through' 100BASE-TX cable

that is properly connected at both ends, and is not

damaged. Refer to the diagram below to compare the

wiring of a straight-through and a crossover cable.

Straight-through Cable

Port Status LED yellow. It is likely that there is a loop

in your network which has caused this port to partition.

Examine your connections and remove the loop. Each

piece of equipment needs only one connection to your

OfficeConnect hub.

Link between two OfficeConnect hubs not working.

Check your hub connections; follow the information

given in the

"Connecting OfficeConnect Hubs

Together"

section. It is likely that an MDI/MDIX switch is

incorrectly set.

Workstation connection not working. Check that you

are using a 100Mbps adapter in your workstation. If

your adapter can operate at various speeds, ensure that

it is set to operate at 100Mbps.

Crossover Cable