In most cases, STANAG-4285 transmissions running at 1200bps/L or 2400bps/L carry a data protocol with a period of 1536 bits, most likely a multiplex system (TDM) capable of carrying up to 192 channels of 8-bit, including the channels used for synchronization. In the examples, a bitstream with 24 x 64-bit channels. Investigating the channels you can see some that have fields containing binary counters.
