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Multiplexing and demultiplexing method and equipments measuring transmission quality and locating operation faults on multiplexed digital channels

  • US 4,845,711 A
  • Filed: 01/15/1987
  • Issued: 07/04/1989
  • Est. Priority Date: 01/17/1986
  • Status: Expired due to Fees
First Claim
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1. A method of measuring the quality of digital channels between a multiplexing equipment and a demultiplexing equipment,said channels respectively applying digital plesiochronous signals fed to said multiplexing equipment for synchronization by utilizing techniques for pulse stuffing into digital stuffed signals which are multiplexed into a digital resultant signal,said resultant signal being supplied to said demultiplexing equipment for demultiplexing into digital stuffed signals which are desychronized by utilizing techniques for pulse unstuffing into outgoing plesiochronous digital signals,said method comprising for each of said digital channels,in said multiplexing equipment, deriving a predetermined characteristic of the respective incoming plesiochronous signal during signal stuffing times for transmission in the form of stuffing bits in the respective stuffed signal, said predetermined characteristic of the incoming plesiochronous signal being a function of the bits in said incoming plesiochronous signal between two consecutive stuffing times,in said demultiplexing equipment, sampling each of said stuffing bits in the respective stuffed signal while deriving a predetermined characteristic of the respective outgoing plesiochronous signal during an unstuffing time, said predetermined characteristic of the outgoing plesiochronous signal being a function of the bits in said outgoing plesiochronous signal between two consecutive unstuffing times, andcomparing said sampled stuffing bit and the derived predetermined characteristic of the outgoing plesiochronous signal to provide a measure of the quality of the respective channel.

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