User Manual
iSiteC BTS3601C CDMA Base Station
BTS Maintenance
Chapter 4 Fault Analysis and Locating
4-11
Fault cause
Fault location
Handling methods
Remarks
Abnormal
transmitting
channel
The logic configuration for the cell
has been completed, but the MS still
cannot access to the network. Please
check whether the transmitting
channel is working normally.
By viewing relevant indicators,
querying board status and
alarm information,
1. Confirm proper installation
of MFEM, MPAM and MTRM,
e.g. inter-module cable
connection, water-proof
measures.
2. Check MTRM transmission
activator status.
3. Check BPAM status.
4. Make sure proper
connection among MFEM,
feeder, antenna and relevant
jumpers.
5. Check antenna installation.
6. Check for any standing
wave ratio alarm.
MTRM, MPAM and MFEM form a
transmission channel with the
antenna & feeder. Any abnormality
with the transmission channel will
cause signal output failure or
abnormal signal output.
Incorrect cell
gain and
common
channel gain
-
The logic configuration for the cell
has been completed, but the MS still
cannot connect to the network.
Please check whether the gain
parameters are correctly set upon
cell configuration.
Through Abis-interface
message tracking tool, find out
whether the gain parameters
carried in the Abis-Cell Setup
message are correct, if
incorrect, reconfigure the BSC
Data Configuration Table.
During logic configuration of the cell,
it is necessary to configure such
parameters as sector gain, carrier
gain, pilot channel gain, sync
channel gain and paging channel
gain, etc. If these parameters are not
properly set (for example: they are
set too low), the MS cannot capture
the common channel and thus
cannot access to the network.
Incorrect
overhead
message
The logic configuration for the cell
has been completed, but the MS still
cannot log on to the network. Please
check whether the overhead
messages are correct
Through the air interface
message signaling analyzer,
check whether the MS has
received all overhead
messages configured by the
system.
Check additionally whether the
parameters of overhead
messages are correct. If
incorrect, modify the data
configuration table of BSC to
update the overhead
messages.
Entering idle status, MS shall receive
all system overhead message,
including
Synchronization message, access
parameter message, system
parameter message, CDMA channel
list message and neighbor cell list
message. Other overhead messages
may vary according to the network
parameter settings.
If any of the above overhead
messages is missing, the MS cannot
access to the network.
Additionally, the value setting of each
message parameter also directly
affects the MS access to the network.
Therefore the parameter values
should also be considered.
Improper MS
location
Move the MS to a place
without any obstacle.
Insufficient
power for MS
Check the power volume of the MS
Charge the battery or replace
a full-duty battery.
II. Data Service Unavailable
1)
Fault Description
Data services cannot be applied normally.
2)
Troubleshooting
