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

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  • 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.
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