User's Manual Part 3

6-11
If the problem persists, replace the Main Hub.
If the problem persists, replace the Expansion Hub.
8
The Main Hub is off.
Make sure the power cord is connected to a live AC power jack and that the
Main Hub power switch is in the
1
position.
9
Main Hub is not properly generating the synchronization signal.
Turn off the Main Hub and turn it back on. If the sync LED stays off, the Main
Hub might require replacement.
10
The Expansion Hub is not properly sending the synchronization signal to the
Main Hub.
The MMF cable connection might not be good, or if the system was working,
the MMF uplink cable is pulled out or cut.
11
The RAU is off.
Check that the UTP/STP cable is operating properly.
If the system was working, the RJ 45 cable is pulled out or cut.