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BEFORE YOU INSTALL YOUR SWITCH

Unit Connections

To connect OfficeConnect units (such as Hubs and other Switches) to

your Switch, you need:

●

One suitable Twisted Pair (TP) cable for each unit.

Workstation Connections

To connect workstations or other equipment (such as servers) directly

to your Switch, you need:

1. One 10BASE-T, 100BASE-TX or 10/100BASE-TX adapter card for

each workstation. 3Com produce a range of easy to install network

adapters.

2. An operating system (for example, NetWare or Windows

95/98/Me/2000) with network support configured, running on your

workstations.

3. One suitable Twisted Pair cable for each workstation.

Figure 2 Workstation connections

HOW YOUR SWITCH CAN BE USED

Switchin

Switching

When a network of repeater hubs is in operation, any information

that is sent by the workstations is passed around the whole network

(regardless of the destination of the information). This can result in a

lot of unnecessary traffic that can slow the network down. The Switch

solves this problem because it 'listens' to the network and automat-

ically learns what workstations can be reached through its ports. It

can then selectively pass on any information by transmitting the traffic

from the relevant port only (instead of all ports like a repeater hub).

This operation is called 'switching'.

The Switch effectively divides up your network, localizing the network

traffic and passing on traffic as necessary. If you have workstations

that communicate frequently in the same part of the network, traffic

between them is not passed on unnecessarily to the remainder of the

network, thereby reducing the load. If you have any high

performance workstations that require a lot of bandwidth, connect

them directly to the Switch.

Connecting 10BASE-T and 100BASE-TX Networks

The 10/100 ports can each be connected to either a 10BASE-T or

100BASE-TX network. If you have both types of network, you can join

them together using the Switch allowing all your workstations to

communicate. Alternatively, if you use 10BASE-T and want to improve

network performance by introducing 100BASE-TX technology, the

Switch protects the investment in your existing workstations because

it maintains 10BASE-T connections to them.

CONNECTING WORKSTATIONS AND OTHER EQUIPMENT TO YOUR SWITCH

Twisted Pair (TP) Cables

Cables can be shielded (screened) or unshielded; 3Com recommends that

you use shielded cable. Cables used for 100BASE-TX connections must be

data grade (Category 5). The maximum length you can use is 100m

(328ft).

Twisted Pair (TP) cables are very easy to use. To connect a TP cable, simply

slot the connector into the relevant RJ-45 port. When the connector is

fully in, its latch locks it into place. To disconnect the cable, push the

connector's latch in and remove it.

When one end of a TP cable is connected to the Switch and the other

end to the network interface card of a workstation the units will

'autonegotiate' to determine the fastest possible link speed between

them. This may take a few seconds and the outcome will be reflected in

the LEDs on the front of the Switch.

The Switch detects all port connections, so you can start using your

network immediately. If you need more ports, simply add another

OfficeConnect unit.

If the equipment connected to the Switch does not support

autonegotiation or if it has been disabled, it must be configured to

operate in half duplex mode

PROBLEM SOLVING

The Switch 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 network equipment is powered on.

●

Power each piece of network equipment off, wait about 5 seconds

and then power each one on.

CAUTION: Do not power the Switch off and on quickly. Wait

about five seconds between power cycles.

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 Switch.

Port Status LED not lit for a port that has a TP cable connected.

After connection it may take several seconds for the port status LED's

to illuminate. The port status LED should turn Green or Yellow for

each port that is connected. Please refer to 'About Your Switch' for a

full description of the LEDs.

lf the Port Status LED has not lit after several seconds ensure the

connected device is powered, the TP cable is not damaged and that it

is correctly inserted at both ends.

Also check whether the correct cable is being used (i.e. straight-

through or crossover), if the uplink port is being used, and whether

the Uplink/Normal Switch is in the correct position.

Expanding Your Network

You can increase the number of workstations that can connect to your

network by adding OfficeConnect Hubs and Switches. You can connect

either a 10BASE-T or a 100BASE-TX OfficeConnect unit to each port of

the Switch. Use the following method for each unit:

1. Connect the Uplink/Normal port of the unit to any of the

Switch's ports (as shown in Figure 3). If using the highest

number port on the Switch (port 5 on Switch 5, port 8 on

Switch 8), set its Uplink/Normal switch to Normal (out).

2. Set the Uplink/Normal switch on the other unit to

Uplink (in).

If you are connecting your switch to a unit with automatic

MDI / MDIX functionality there is no need to follow the steps

described above. The connection will happen automatically.

Checking Unit Connections

When you have connected all your units, power on the units

and the Switch. The Port Status LEDs for the ports you have

used on both the units and the Switch should be on. If they

are not, check your connections and the settings of the

Uplink/Normal switches.

Spot Checks

At frequent intervals, visually check that:

●

Case vents are not obstructed.

●

Cabling is secure and not pulled taut.

DIMENSIONS AND STANDARDS

Dimensions and Operating Conditions

Standards

EMC:

EN 55022 Class B

EN 55024

Functional:

ISO 8802/3

IEEE 802.3, 802.3u

FCC Part 15 Class B*

ICES-003 Class B

Safety:

UL 1950, EN 60950

CSA 22.2 #950,

VCCI Class B

CNS 13438 Class A

IEC60950

Environmental:

EN 60068 (IEC 68)

* Refer to Regulatory Notices section in the Support and Safety Information sheet

Switch 5 480g (1.1 lb)

Switch 8 535g (1.3 lb)

OfficeConnect

Switch

Figure 3 Correct Connections for an OfficeConnect Switch

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