Communication facility integrity checking arrangement

Details Communication facility integrity checking arrangement Communication facility integrity checking arrangement

1976-11-17

1977-12-27

Cooper, William C.

179 27D, H04M 706

Patent

active

040656438

ABSTRACT:
Circuitry for integrity verification is provided to prevent a calling party from unknowingly remaining connected to a faulty trunk connection between an automatic switching office and an operator-assisted office. New circuit arrangements are added to the outgoing trunk circuit of the automatic office and to the line circuit of the operator-assisted office. At the outgoing trunk circuit, binary memory elements and associated circuitry are employed to delay the completion of the normally executed cross-office continuity check at the automatic office, thereby delaying release of common control equipment at that office. During the delay interval, interoffice integrity check signals are exchanged between the outgoing trunk circuit and the line circuit. Circuitry is added to the line circuit for the generation of a wink signal in response to a seizure signal from the outgoing trunk circuit. This wink signal is received at the trunk circuit as a timed off-hook signal followed by a steady on-hook signal. Only after interoffice integrity is thus verified does the outgoing trunk circuit allow for completion of the cross-office check and for the resultant release of common control equipment. If the interoffice integrity check is unsuccessful or unduly delayed, the caller is connected to a reorder trunk by normally-provided timeout circuitry.

REFERENCES:
patent: 1751263 (1930-03-01), Cesaro
patent: 2564441 (1951-08-01), McKim et al.
patent: 2868884 (1952-05-01), Gooderham
patent: 3239690 (1966-03-01), Krom
patent: 3643034 (1972-02-01), Burns et al.
patent: 3809823 (1974-05-01), Jacobs et al.
patent: 3904832 (1975-09-01), Fallon

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