Allied Telesis FastHub16 - Manual (Page 18)

Troubleshooting
12
100M LED
If the 100M LED for the port does not indicate the correct speed, check the
following:
❑ If the port is auto-negotiating, wait 1-3 seconds after the device cable
is connected, or power is applied, for the negotiation process to
complete.
❑ If Port 8 is used as an “Uplink”, check that the cable length used for
an uplink does not exceed 5 meters (16 feet) in an 100 Mbps
configuration.
❑ For Ports 1 and 2, check that the speed is correctly set on the DIP
switch. If necessary, adjust port speed on Ports 1 and 2 by manually
setting the DIP switches before connecting other devices.
Connectivity Testing
The following procedure tests each port for a valid connection and correct
operation of the network.
1. Power OFF the unit.
2. Starting with Ports 1 and 2, set the DIP switch (on the back of the unit) to
the appropriate configuration. Refer to “Station Connections” on page 10.
Connect these two ports of a single unit to two nodes or workstations and
apply power to the hub.
3. Make sure the Link/Activity and other LEDs of both hub ports are lit. If
the port is auto-negotiable, wait approximately 1-3 seconds for the process
to complete after power is applied or after the cables are reconnected.
4. After confirming that Port 1 and Port 2 are operational, reconnect one of
the nodes/workstations to another port, then repeat this communications
test with the hub’s remaining ports. Continue to verify the connection on
each port by checking the Link/Activity and other LEDs of both hubs.
Note
When testing Port 8 connection to a workstation, set the uplink
switch to the Normal position.