Bit Interleaver COM-1016 -> BPSK modulator COM-1002 -> 
QPSK demodulator COM-1001 -> Bit Deinterleaver COM-1016 -> BER measurement COM-1005.


Test configuration example: 9.9 Mbit/s BPSK. 

The bit interleaver is placed in signal generator test mode, 
whereby a periodic 2047-bit sequence (PRBS-11) is being transmitted. 
The resulting data stream is bit interleaved, BPSK modulated, BPSK demodulated and bit deinterleaved. 
The end to end BER is measured using the COM-1005 module. The registers settings are as follows:

COM-1016: 26 00 10
COM-1002E: A4 70 FD 00 00 00 FF 00 81 00
COM-1001E: 52 B8 7E 00 00 00 81 00
COM-1016: 07 00 10
COM-1005: 00

Proper operation can be verified as follows:

(a) using an oscilloscope probe:

COM-1001 TP1 is high, indicating demodulator carrier lock 

COM-1005 TP1 is high, indicating synchronization with the 2047-bit periodic test pattern 

COM-1005 TP3 is low, showing no bit error pulse.


(b) from the ComBlock control center check the BER (COM-1005 status).
It will show no bit errors (REG 1 through 4) and the synchronization bit (REG5 bit0) is high.
Depending on the demodulated phase ambiguity, the BER can be either 0 (no inverted bit) 
or 0x0F4240 (all bits inverted).