User Manual
iSiteC BTS3601C CDMA Base Station
BTS Maintenance
Chapter 4 Fault Analysis and Locating
4-8
2)
Troubleshooting
Fault cause
Fault location
Handling methods
Remarks
Fault with
antenna &
feeder
(including
antenna and
feeder)
Measure the VSWR of the antenna & feeder with
sitemaster and check whether it is normal (It
should be less than 1.5)
If the VSWR is much greater than the
rated value, please conduct further
tests so as to locate the faulty section in
the antenna & feeder (or antenna), and
then make the required rectification or
replacement.
Normally, the
VSWR of the
antenna &
feeder should be
smaller than 1.5.
In practice, poor
connection
should be
suspected upon
a VSWR greater
than 1.3.
Power output
of MFEM is
abnormal
1. Test the downlink power output at the export of
BFEM. If a great difference exists between the
result and the nominal power value, the RF
downlink channel of the BTS is faulty.
2. Start the BTS and measure the power output
directly at the output terminal of MPAM. If the
power is normal, the transmission tributary of
MFEM is faulty.
3. If the output power measured at MPAM output
terminal is abnormal, measure the power output
at the output port of MTRM. If the result is normal,
MPAM may be faulty; otherwise MTRM is faulty.
If MTRM, MFEM or MPAM is found
damaged, replace it.
II. Signal Fluctuation
1)
Fault Description
The signals received by MS fluctuate too much.
2)
Troubleshooting
Fault cause
Fault location
Handling methods
Remarks
Power output of BTRM is
abnormal
1. Check the power output with
power meter at MFEM. If the
output power is unstable, output
problems exist with either
MPAM or MTRM.
2. Check the power output of
MTRM. If the power if stable,
MPAM must be faulty;
otherwise MTRM must be
faulty.
Replace faulty modules.
External interference
None
Remove the interference source
4.2.5 Service Fault
BTS3601C can support voice and data services. The BTS serves as access equipment,
functioning as RF channel. In the case of fault like service interruption, please first
remove such faults as transmission interruption and BTS power failure, and then locate
other faults as per the following procedures:
