Maintenance of stored program controlled switching systems

Details Maintenance of stored program controlled switching systems Maintenance of stored program controlled switching systems

1982-08-30

1985-01-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 13, H04J 314

Patent

active

044930739

ABSTRACT:
A time division, digital switching system capable of performing on-line testing of the actual communications paths that are switched is disclosed. When an idle network time slot is found, a test vector register places a stimulus in the idle time slot and the stimulus is directed to the address of an idle port. A loop-around path which includes a signature analysis chip (SAC) device is activated to divert a portion of the stimulus toward the SAC device. The response of the SAC device is gated to a maintenance circuit which reads the generated signature. Advantageously, the stimulus is selected to generate minimum noise at the addressed port so that if the user at the idle port picks up the telephone during the time slot used for testing, no loud noise will be heard.

REFERENCES:
patent: 3609704 (1971-09-01), Schurter
patent: 3920920 (1975-11-01), Lager et al.
patent: 4149038 (1979-04-01), Pitroda et al.
patent: 4195206 (1980-03-01), Baichtal
patent: 4296492 (1981-10-01), Hafer
patent: 4402074 (1983-08-01), Cupuis et al.
IECI 1978 Proceedings, Mar. 20-22, 1978, "Signature Analysis-Enhancing the Serviceability of Microprocessor-Based Industrial Products", pp. 68-76.
ISS Switching Journal CIC Montreal, Sep. 21-25, 1981, "An Experimental Digital Switch for Data and Voice", pp. 1-7.
IEEE Transactions on Computers, vol. C-31, No. 1, Jan. 1982, "Design for Testability-A Survey", pp. 2-15.
Bell System Technical Journal, Sep. 1964, "No. 1ESS Maintenance Plan", pp. 1961-2019.
Hewlett-Packard Journal, May 1977, "Signature Analysis: A New Digital Field Service Method", pp. 2-8.
Hewlett-Packard Journal, May 1977, "Signature Analysis-Concepts, Examples, and Guidelines", pp. 15-21.

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