| 摘要 |
A WDM system carrying a plurality of optical signals, each at a respective wavelength, is provided whereby each optical signal includes a plurality of frames, each frame conforming to a synchronous optical network (SONET) standard. A plurality of optical transmitter modules output a corresponding one of the plurality of optical signals, and each of a plurality of optical selectors at a receiving end of the WDM system selects a respective one of the plurality of optical signals. In addition, a plurality of receiver modules are provided respectively connected to each of the optical selectors. Both the transmitter and receiver modules include byte extraction circuitry that extracts one byte, e.g., the JO byte, from each of the plurality of frames. Successive bytes are grouped as messages, which are stored in registers so that comparisons can be made between consecutive messages and a predetermined message.
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