Digital Media 900TL - Manual (Page 13)

Problem Solving
If ... Then ... Do This ...
DEChub 900 MultiSwitch and DEChub ONE
Power LED is off. MAU does not have power. Verify that outlet has power.
Check power connection to MAU.
Replace power supply.
Replace MAU.
Module OK LED is off. MAU failed self-test. Replace MAU.
Ring A and B LEDs alternately MAU needs an upgrade If you have network management,
flash. or an upgrade is in progress. do a downline load;
otherwise, replace MAU.
Wait for upgrade to complete.
Both Speed LEDs are off. No activity is on the network. Start up at least one station.
Lobe LED is off after station Station cannot access Check lobe cabling for crossover
completes self-test network. between transmit and receive
wires. All cables, including patch
cables, must be straight through.
Lobe LED indicates a Network management To change setting, you can use
continuous single flash disconnected station from the network management commands
pattern. network. or the MAU’s Reset switch.
Lobe LED indicates a MAU and station have different Change the speed setting of the
continuous double flash speed settings. station.
pattern.
DECmau 900TL 13