WaveRider LMS4000 User Manual page 166

12 Troubleshooting
Table 35 Local Troubleshooting — CCU
TIP
I
TIP
J
Confirm CCU RF
network output power.
K
Verify RF network and
L
components.
M
N
O
Go to if you have an
P
interferer.
148
What should I do? What is a good result?
Having a captive EUM at the CCU site can be helpful to isolate problems. With a
simple antenna, the captive EUM can be accessed from the CCU to confirm the
communications capability of the CCU, and the EUM can roughly verify the output
signal levels from the CCU.
If only EUMs with high signal levels (i.e., typically those close to the CCU) can be
accessed, suspect an interferer.
Check with other EUM Receive RF signal is per
sites and confirm that the original installed value.
receive signal level is per
the original installed
value.
Visually inspect all RF Connectors look OK.
connections.
Use an RF sweep No discontinuities
generator test to look for shown.
discontinuities in the RF
path.
Use a spectrum analyzer The CCU transmit power
to verify the RF system at the CCU radio port
and CCU output. should be approximately
26dBm, using a
resolution bandwidth >
5MHz.
Measure the CCU
receive power with a test
antenna on the spectrum
analyzer. Adjust the
reading based on the
distance from the CCU
antenna.
What does a good
What if I do not get a good result?
result mean?
If a captive EUM cannot be accessed, even
when set up in a high-signal receive area,
replace the CCU. If access is still not
possible, replace the CCU antenna system
with a "test antenna", located 15' or so from
the captive EUM, and repeat Tests G and H.
Go to If You Have an Interferer
CCU radio network Go to Test L.
output is normal. Go to
Test P.
Go to Test M. Repair connectors.
RF path looks OK. Go to RF path component is faulty. Repair/replace,
Test N. as appropriate.
CCU output is OK. Go to Replace the CCU.
Test O.
RF path is OK. Go to Recheck RF path components.
Test P.
on page 149.
APCD-LM043-4.0