User Manual
Product information and planning
9500 MPR Rel. 3.1
3DB18809AAAA Issue 1 155/980
2.8.8.2.1 RPS Switching Criteria
The switching criteria are:
– SF (Signal Fail): generated from transmission and equipment alarms affecting the Rx radio section
– Rx Fail
– Demodulator Fail
– LOF of aggregate signal radio side
– inter-MPT coupling link failure
– HBER (high BER) based on the demodulated erroneous blocks ratio
– EW (Early Warning) based on MSE
Moreover, MPT-HC supports a further embedded functionality called "Enhanced RPS". Enhanced RPS
is a frame-based protection mechanism, aimed to reach a quick reaction time and increasing significantly
the quality of the radio interface in the Rx side. It assumes the alignment between the 2 received radio
channels and it is based on frame by frame selection of the "best" frame between the frames received
from the Main and the Spare radio channel. The Enhanced RPS assumes that the "classical" RPS criteria
are used to give indication about the "preferred" channel, whose frame has to be selected, when the
frame-based choice between the 2 streams is not possible (e.g. due to the frame alignment error). The
Enhanced RPS switching criterion depends on the presence of errors in the decoded LDPC word.
2.8.8.2.2 EPS Switching Criteria
The switching criteria are:
– MPT Access Card Fail status
– IDU-ODU Connection Failure
– ICP alarm
– Mated MPT Access card Failure
2.8.8.2.3 HSB Switching Criteria
The switching criteria are:
– MPT Access Card Fail status
– IDU-ODU Connection Failure
– ICP alarm
– Incompatible Shifter alarm
– Incompatible Frequency alarm
– Incompatible Power alarm
– Incompatible Modulation Parameters alarm
– Mated MPT Access card Failure
– Inter-MPT coupling link failure. Where there is a cross configuration (EPS on Spare & TPS on main),
HSB (TPS) will switch and align with EPS position, if there is an inter-MPT coupling link failure.
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