COM-1010 Convolutional Encoder -> COM-1009 Viterbi Decoder -> COM-1005 BER measurement

Objective: demonstrate back-to-back convolutional encoder - viterbi decoder operation
at (near) the maximum decoder throughput. The convolutional encoder is configured 
in signal generator test mode whereby a periodic 2047-bit (PRBS-11) sequence is being transmitted. 
The end to end BER is measured using the COM-1005 module. 


Test configuration example in 1010_1009_1005.stn settings file: 
  COM-1010: internal clock, K=7, R= 1/2, non-differential, 
  serial output, PRBS-11 test pattern, encoded data rate: 7.5Mbit/s.
  COM-1009A: K=7, R= 1/2, non-differential, hard decision,
  COM-1005: measure bit errors over 1Mbit window.

Proper operation can be verified as follows:

(a) load the 1010_1009_1005.stn settings from the ComBlock Control Center File | Import menu.

(b) using an oscilloscope probe, verify that:

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

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

COM-1005 TP4 shows regular periodic start of frame pulses every 2047 bits = 545.8 us.

(c) 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.