| 摘要 |
An analogue telemetry system/method for locating faults in an optical transmission system including optical fibre amplifiers. A supervisory tone is applied at the transmission end of the system and its presence/absence detected at each amplifier. In the event of "absence", a respective distress tone is applied at the relevant amplifier, and each subsequent amplifier will also apply its own distress tone. At the receiver end of the system, the supervisory tone is sought and in its absence, the number of distress tones, if any present, is counted and the position of the fault is thus determined. <IMAGE>
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