×

Monitor system for multiplex equipment

  • US 4,993,013 A
  • Filed: 09/29/1989
  • Issued: 02/12/1991
  • Est. Priority Date: 10/16/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of monitoring a multiplex equipment which includes a multiplexing unit for multiplexing low speed group input signals of plural channels into a high speed group output signal and a demultiplexing unit for demultiplexing a high speed group input signal into low speed group output signals of plural channels, wherein said high speed group output signal and said low speed group input signals and said high speed group input signal and said low speed group output signals are monitored through comparison on the basis of the low speed group signal, comprising:

  • (a) a step of performing comparison of said high speed group output signal and said low speed group input signals in accordance with the order of the channel sequence of the low speed group signals and subsequently performing comparison of said high speed group input signal and said low speed group output signals in accordance with the order of the channel sequence of said low speed group signals, said step being repeated until discrepancy is detected from said comparison;

    (b) a step in which, when discrepancy between said high speed group output signal and a low speed group input signal is first detected in a given one of the signal channels of said low speed group signals, step (a) is discontinued and comparison is then performed between the high speed group input signal and the low speed group output signal in another channel differing from said given one channel of the low speed group signals, said comparison being subsequently performed in said order of comparison; and

    (c) a step in which, when discrepancy is first detected between the high speed group input signal and the low speed group output signal in a certain channel of the low speed group signals, step (a) is discontinued and comparison is then performed between the high speed group output signal and the low speed group input signal in another channel differing from said certain channel, said comparison being performed in accordance with said order of comparison.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×