Problem Solving

If ...

Then ...

Power LED is off.

Module OK LED is off.

Ring A and B LEDs alternately flash.

Both Speed LEDs are off.

Lobe LED is off after station completes self-test

Lobe LED indicates a continuous single flash pattern.

Lobe LED indicates a continuous double flash pattern.

MAU does not have power.

MAU failed self-test.

MAU needs an upgrade

or an upgrade is in progress.

No activity is on the network.

Station cannot access network.

Network management disconnected station from the network.

MAU and station have different speed settings.

Verify that outlet has power. Check power connection to MAU. Replace power supply.

Replace MAU.

If you have network management, do a downline load;

otherwise, replace MAU.

Wait for upgrade to complete.

Start up at least one station.

Check lobe cabling for crossover between transmit and receive wires. All cables, including patch cables, must be straight through.

To change setting, you can use network management commands or the MAU's Reset switch.

Change the speed setting of the station.

DECmau 900TL