| 摘要 |
A method for surveilling a telecommunications network link includes disposin g a link demarcation device (LDD) at a point on a network link, the LDD dividing the network link into a first network link section and a second network link section, the LDD being configured to perform self-monitoring and monitoring of the first and second network link sections, operating the LDD to transmit one of a plurality of unique fault-indicating signals based upon a specific detected fault-indicating condition, wherein each of the unique fault-indicating signals corresponds to a detected fault- indicating condition, detecting the unique fault-indicating signal with a link delimiting device (LLD) communicatively coupled to the LDD by one of the first and second network li nk sections, and unambiguously identifying the unique fault-indicating signal with the LLD, wherein the unique fault-indicating signals are selected to be readily distinguishable by an existing detection and alarming capability of the LLD.
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