3Com 8 manual Switch set to Normal out Uplink

Connecting Hubs Using 10BASE-T

You can connect hubs together with 10BASE-T in a number of ways, but for simplicity we recommend the following method, as shown in Figure 8:

1Starting from the bottom, connect the port 8 of the lower hub to port 7 of the hub immediately above. Repeat this for each hub.

2Set all Uplink/Normal switches to Uplink (in) except for the top hub (the one with port 8 not connected to another hub). This unused port can be connected to a workstation provided that the Uplink/Normal switch is set to Normal (out).

Checking Connections

When you have connected your hubs, power them on. The Port Status LEDs for the 10BASE-T ports you have used should be green. If they are not, check your connections. If the 10BASE-2 port is not used and is not terminated, the LED should be yellow showing that it has partitioned. This is correct operation.

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.

If you suspect there is a problem, refer to “Problem Solving for the Hub 8 and 8C” on page 22.

Figure 8 Correct Hub Connections Using 10BASE-T

Switch set to

Normal (out)

Switch set to

Uplink (in)

Switch set to

Uplink (in)

10BASE-T cable with RJ-45 connectors.

Maximum length of

each cable is 100m (328ft)

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