Maintenance Guide Part 1

NeTIS MAINTENANCE GUIDE – Version 1.1 20/139
*Check according to your measurement bench:
With a digital TETRA bench measure the frequency error at the UCM or PA output; it
should be less than +-100Hz. If this is not the case, check the clocks.
With an analogue bench, check the frequency error at the UCM or PA output; it
should be less than +-100Hz. To do this keep the 2.25 KHz test button on the face of
the UCM pressed down in order to observe a pure offset carrier compared to the TX
BS frequency of 2.25 KHz.
If this is not the case, check the clocks:
If the BS is synchronised on the GPS signal, then check the rhythm of the GPS
indicator on the CPUBDT board
Or consult the GPS alarms on the network management terminal by zooming on the
NeTIS and then viewing the BDT status by clicking on the resource (See below)