| 摘要 |
A method and apparatus for monitoring signals communicated over a signal path from a source to a destination with the signals containing a set of data representing a data signal type comprises a first device for accessing a first portion of the data set from the received signal and generating a first indication signal relating to a status of the received signal; a second device for accessing a second portion of the data set from the received signal and generating a second indication signal relating to a further status of the received signal; and, a device for generating a composite signal representing a combination of the first and second indication signals for indicating a specific status of the received signal. The types of signals include normal VC-n signals, unequipped VC-n signals and supervisory-unequipped VC-n signals communicated in an SDH/SONET network, the composite signal capable of uniquely identifying receipt of unequipped VC-n signals over a signal path in the network.
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