Continuity-checking network for telecommunication system

Details Continuity-checking network for telecommunication system Continuity-checking network for telecommunication system

1976-02-11

1977-05-17

Olms, Douglas W.

1791752R, H04B 346

Patent

active

040243591

ABSTRACT:
A marker at a central-office terminal, controlling the establishment of connections between local subscriber lines and inter-office links via an associated line concentrator/distributor, includes a test-signal generator connected via a two-way coupler to an outgoing branch of an engaged link, a first signal receiver connected by the coupler to an incoming branch of that link, and a second signal receiver inserted in a normally balanced phantom circuit formed by incoming and outgoing branches of a local line communicating with the link. Upon the establishment of a connection including such a link between two subscriber lines served by respective central-office terminals, an alternating test signal generated at one terminal must be detected with a predetermined minimum threshold by the first receiver but not by the second receiver of the other terminal before message transmission over this connection can be initiated.

REFERENCES:
patent: 3138670 (1964-06-01), Maurushat et al.
patent: 3626383 (1971-12-01), Oswald et al.
patent: 3691309 (1972-09-01), Gartner et al.
patent: 3851122 (1974-11-01), Gibson
patent: 3860769 (1975-01-01), Pachynski
patent: 3937908 (1976-02-01), Funk et al.

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