• Combine bits from four tributaries.

  • Insert a 10-bit frame alignment word (FAW).

  • Perform justification (interleave the four tributaries).

  • Transmit an alarm signal in the event of failure.

  • Recode the interleaved signal.

The main functions of the receiving end of an 8Mbit/s digital multiplexer/demultiplexer (muldex) used in a plesiochronous digital hierarchy.


  • Demultiplex the input into four tributaries.

  • Extract and monitor the FAW.

  • Interpret the synchronisation.

  • Display any alarms.