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Airbridge cBTS3612-450 12-carrier CDMA Base Station
4 Base Station Initialization Failure Fault
4.1 Description of fault
The base station, when powered on, fails to be initialized, which makes it unable to be
in normal service. Once such a fault occurs, the ACT indicators on some boards
flashes quickly.
4.2 Fault Analysis and Location
There are quite a lot of factors leading to failed initialization of a base station, but in
summary, the following aspects can be taken into consideration to locate and solve
those problems.
I. Link fault
The prerequisite for successful initialization of a base station is that an ATM link
should be successfully established between the BCIM of the base station and XIE
board of BSC. And the BCIM board of the base station is required to successfully
intercept the link configuration of the XIE board of BSC and establish the
corresponding IMA/UNI link. If the BSC configuration data are wrong (or no
corresponding physical link configured), then BCIM cannot make a successful
interception and this leads to failed link establishment.
In addition, the base station BOOTP failure and failed establishment of an OML may
lead to unsuccessful initialization of the base station. For such a case, please refer to
"5.1 OML Fault".
II. Clock fault
After a base station has successfully established an OML, BSC will send
corresponding configuration data. In this case, some boards of the base station must
have correct clock signals before they are in normal service. Thererfore, check is
necessary when a base station fails to be initialized after the configuration is sent.
1)
Whether the clock signals of a base station are correct.
2)
Whether the clock output of BCKM is normal.
3)
Whether BCKM and GPS or GLONASS antenna are well connected.
4)
Whether the captured GPS or GLONASS satellites are more than 4.
For the above (1) and (2), please refer to "6.2
(BCKM)". As for (3), please refer to "7.2 Satellite Antenna Feeder Part". (4) may be
caused by geographical position. If it is found that the captured GPS or GLONASS
satellites are not more than 4, the base station may not be able to obtain reliable
clock signals.
III. BCPM Configuration Data Error
If the BCPM board configuration data sent by a base station are wrong, the base
station may fail to be initialized. Please locate such a fault as follows:
1)
Whether BCPM board No. and its physical slot form one-to-one correspondence.
2)
Whether the cell parameters of a channel board are correctly configured.
03Q-0112-20020720-120
4 Base Station Initialization Failure Fault
BTS Control & Clock Module
4-1
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