User Manual Chapter 7

7-24 Chapter 7: Testing and Troubleshooting
Step 3. Improve the infrastructure.
Problem Causes Possible Remedies
Primary CBS sends a
timing signal that is used
by all secondary CBSs.
Bad communication
cable.
Check communication cabling.
All secondary CBSs
report "sync lost"
diagnostic.
Bad primary CBS. Replace primary CBS.
Antenna not connected. Connect antenna.RX antenna
configuration
diagnostics do not
match site plan.
Antenna damaged or
missing.
Replace antenna.
Bad communication
cable.
Check communication cabling
between CBSs, in particular the
MCLK wire pair.
Some CBSs report
RF board sync lost.
Problem may be
intermittent.
Bad CBS. Replace CBS.
CBSs were powered on
while communications
were closed.
Open CBS communications using
DNCBSMTEST.
Bad communication
cable.
Check communication cabling
between CBSs, in particular
MCLK wire pair.
CBS reports DSP
ROM version V0
with checksum V0.
Defective CBS. Replace CBS.
Damaged TX cable or
antenna.
Replace TX cable or antenna.
Power or communication
cable run is too long.
Check cable length guidelines.
Shorten cable run if necessary.
CBS reports
intermittent or
continuous low
output power
diagnostic without
RF power off
diagnostic.
Defective CBS. Replace CBS.
CBS reports low
output power
diagnostic and RF
power off
diagnostic.
dncbsconfig.xml not
configured to include
problem CBS.
Fix dncbsconfig.xml.