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Method and apparatus for alarm surveillance for an optical transmission system

  • US 5,440,418 A
  • Filed: 06/23/1993
  • Issued: 08/08/1995
  • Est. Priority Date: 07/15/1992
  • Status: Expired due to Term
First Claim
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1. A method for operating a first optical repeater apparatus disposed between an input optical fiber and an output optical fiber, the first optical repeater apparatus including a first optical amplifier means for amplifying a main signal received on the input fiber and transmitting the amplified main signal on the output fiber, the first optical amplifier means having a status, the first optical repeater apparatus additionally including first managing means for generating management information, the first managing means having a status, said method comprising the steps of:

  • (a) receiving a management signal on the input fiber from a second optical repeater apparatus;

    (b) examining the status of the first managing means;

    (c) examining the status of the first optical amplifier means if the status of the first managing means is normal, and;

    (d) forwarding the management signal received in step (a) by emitting the received management signal on the output fiber if the status of the first managing means is normal and the status of the first optical amplifier means is normal.

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