• 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.