27 June 2018

CIS-14 FSK 96Bd/500


Although the name FSK 96Bd/500, the used shift of this sytem is 480 Hz. Speed is 96Bd and the two 5-bit data words are bit-interleaved according to the CIS-14 format; first two bits are the system bits: t_a and t_b: 0 = traffic, 1 = idle (or no traffic). As you can see in the demodulate stream, only channel b transports data (figure 1). It's probably a test transmission since data are in clear-text mode and consist of a "classic" Russian test sequence "GA VIL BY CITRUS? DA,NO FALX"  (figure 2), something like "the brown fox jumps over the lazy dog".

Fig. 1
Fig. 2
Another example of a CIS-14 96Bd/500 bit-interleaved is shown in figure 3

Fig. 3
https://yadi.sk/d/4LlYlL_cIb8Myw


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