Supervision of digital transmission systems

Details Supervision of digital transmission systems Supervision of digital transmission systems

1983-08-26

1986-01-14

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

17917531R, 371 22, H04J 116, H04J 314, H04B 346

Patent

active

045649332

ABSTRACT:
A supervisory method for a digital optical submerged transmission system in which a multi-bit test signal is detected by a repeater while receiving a loop-back signal for causing loop-back condition, and the mix of the bits of the test signal is changed to change a d.c. level derived in the repeater from the test signal. This is compared with a local reference level and after comparison a sign change is indicated the loop-back condition is either enabled or disabled and that event is detected enabling the required input or output level of the repeater to be checked.

REFERENCES:
patent: 3290451 (1966-12-01), Duimelaar
patent: 3692964 (1972-09-01), Camiciottoli et al.
patent: 3739098 (1973-06-01), Camiciottoli et al.
patent: 3760127 (1973-09-01), Camiciottoli et al.
patent: 4069402 (1978-01-01), Mantorani et al.
patent: 4161635 (1979-07-01), Wolarer
patent: 4402075 (1983-08-01), Bargeton et al.

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