Originally Posted by WA0CBW
When in failsoft there is no Control Channel information. Each repeater (including the control channel) becomes a conventional repeater with a continuous carrier and a beep tone to indicate it is in failsoft. When in failsoft the site controller is not operational.
He's aware of this. He was asking what the data format is that announces the carrier as being in Failsoft which the radios in turn decode as FS and operate in that mode.
ronen, are you talking about the low-speed data for Priority Monitor scanning? Off the top of my head it has a rudimentary structure. I can't say if there are sync bits. See US Patent 4,716,407.