Method for monitoring the quality of a digital signal in section

Details Method for monitoring the quality of a digital signal in section Method for monitoring the quality of a digital signal in section

1989-05-09

1990-10-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 17, 370 99, 3701051, 3701101, H04J 314

Patent

active

049641123

ABSTRACT:
A method for monitoring the quality of a digital signal in sections of a data transmission circuit wherein the quality of the transmitted digital signals is monitored in a synchronous network by digital signal distributors arranged along the circuit and the acquired data is forwarded to a centrally controlled emergency network switching system. A BIP-8 code word (bit-interleaved parity-8 code) in a B3 time slot for parity monitoring is transmitted from the source to a sink in the path overhead of a virtual container (VC-41) in a STM-1 signal. The code word is also transmitted as B4 monitoring in a Z time slot (Z4) of the path overhead which is available, and it is evaluated in every digital signal distributor and is re-supplied into the outgoing line of the signal distributors. Since every modification in the virtual container (VC-4) falsifies the B3 monitoring, a correction code word which cancels the modification by the BIP-8 code word in the first Z time slot (Z4) is inserted in a further Z time slot (Z5).

REFERENCES:
patent: 4594708 (1986-06-01), Servel et al.
patent: 4712209 (1987-12-01), Kuritani et al.
patent: 4821256 (1989-04-01), Schmidt et al.
Article Telecom Report 10, 1987, No. 5, pp. 260-264.
Equivalent article in German.
Article of International Telegraph and Telephone Consultative Committee CCITT of Nov. 1987 COM XVIII-113-E, entitled "Report of the Meeting of Experts on Broadband Interface Aspects of Study Group XVIII", (Geneva, Nov. 9-11, 1987.
CCITT Publication of Aug. 1986, entitled "Part C of the Report of the Geneva Meeting" (Jul. 1-8 1986.

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