Maintenance Guide Part 1

NeTIS MAINTENANCE GUIDE – Version 1.1 22/139
If the BS is synchronised with a G703 link, then:
Adjust the remote SWITCH reference if the CPUBDT is not synchronised
with an external clock source
If the SWITCH is synchronised with the GPS, the CPUBDT receives the GPS signal;
check the rhythm of the GPS indicator on the CPUBDT
The general check of the clock signals is carried out from the front face of the CPU_BDT
module using the selector located on the top.
All the clock signals must be perfectly recurrent, stable and exempt from jitter.
Check in the following order:
position 7: TETRA clock symbol 18 KHz
position 5: clock time slot 70 Hz
position 4: clock frame 70 / 4 Hz = 17.5
position 3: multiframe 1.02 second (18 frames)
2.6.5 T RANSMISSION FAULT
2.6.5.1 The transmission command indicator, CTX on the UCM stays off
Check that the UCM is receiving data from the central processing unit - this traffic is viewed
via the IO indicator on the UCM front face which should light.
If data is being received, the UCM board is defective.
Otherwise check the central processing unit and the settings.