User's Manual

Maintenance, Troubleshooting, and Technical Assistance
10-6 LGCell 4.0 Installation, Operation, and Reference Manual PN 8100-40
620004-0 Rev. B
Notes:
1. System is functioning properly.
2. The Expansion Hub is off.
Make sure the power cord is connected to a live AC power jack and that the
Expansion Hub power switch is in the on (
1) position.
3. Power is being delivered to the RAU but it is not turning on.
a. Check that the UTP/STP cable has been properly crimped and passes a stan-
dard TIA/EIA 568-A Cat-5 compliance test.
b. If the cable is not the problem, replace the RAU.
4. Power is not being delivered to the RAU.
• Move the UTP cable to a different RJ-45 connector on the Expansion Hub to
see if the same problem occurs.
– If the LEDs on the new port are both green, there is a problem with the
Expansion Hub.
– If the problem persists, there is a problem with either the RAU or the
UTP/STP cable.
• Check that the UTP/STP cable has been properly crimped and passes a stan-
dard TIA/EIA 568-A Cat-5 compliance test.
– If the cable passes the Cat-5 test, replace the RAU.
5. RAU has lost synchronization.
• Make sure that the UTP/STP passes a standard TIA/EIA 568-A Cat-5 test.
– If the cable passes the Cat-5 test, replace the RAU.
6. The Expansion Hub is not properly receiving the synchronization signal from the
Main Hub.
a. The MMF cable connection might not be good or if the system was working,
the MMF downlink cable is pulled out or cut. Switch MMF cables.
b. If the problem persists, move the MMF cable to a different Main Hub port on
a different Expansion Hub. If this solves the problem, the Main Hub port on
the first Expansion Hub is malfunctioning.
c. If the problem persists, there is an Expansion Hub problem.
• If moving MMF cables to a different Expansion Hub is not practical, switch the
uplink and downlink pairs. (A connection error may have been made when
connecting the Main Hub
UP port to the Expansion Hub UP port, and similarly
for the
DOWN ports.)
– If the Expansion Hub unit
SYNC LED turns green, one of the MMF cables
was bad or the connection between the Main Hub and Expansion Hub was
done incorrectly. If both are bad, this test will not help. Switch to a different
Main Hub port.