| 摘要 |
PCT No. PCT/GB91/02254 Sec. 371 Date Aug. 30, 1993 Sec. 102(e) Date Aug. 30, 1993 PCT Filed Dec. 17, 1991 PCT Pub. No. WO92/11710 PCT Pub. Date Jul. 9, 1992.A line monitoring arrangement of an optical fibre communications system carrying system data signals includes a test sequence generator, an optical transmitter and a correlator. The generator generates a sequence of test pulses, and the optical transmitter repeatedly launches the sequence of test pulses into a first end of a transmission line forming part of the communications system. The correlator correlates signals received at the first end of the transmission line with the sequence of test pulses to identify returned test pulse sequences. The test pulse sequences and system data signals are superimposed onto the transmission line.
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