Interface between Synchronous Data Networks Using an 8 + 2 Envelope Structure and Single Channel per Carrier (SCPC) Satellite Channels - Data Communication Networks - Transmission, Signalling and Switching, Network Aspects, Maintenance and Administrative
The mechanism, described above, is chosen due to the fact that the information on the S bit changes very slowly. The process will only bring a delay of 6 bits for the signal signalling transition when the
corresponding S bit is affected.