1975-03-25
1976-04-20
Cooper, William C.
H04Q 362
Patent
active
039521656
ABSTRACT:
A tie trunk control arrangement is disclosed for providing tie trunk connections in an electronic private automatic branch exchange which is built around a space divided solid state matrix. Each tie trunk has an associated tie trunk junctor dedicated thereto which may be connected to local stations by the PABX system in a manner similar to other trunk junctors. For incoming tie trunk connections an attendant extension or station attendant extension is used for providing connections to other PABX stations and trunk circuits. Common circuitry used for trunk transfer and trunk consultation may be used by the station attendant to extend the tie trunks to the PABX stations and the outgoing trunk junctors. Further circuitry is provided by the tie trunk control arrangement to allow a tie trunk and a central office trunk to be tandemed in the system or to allow two tie trunks to remain tandemed in the system without attendant supervision.
REFERENCES:
patent: 3384717 (1968-05-01), Coston
Pommerening Uwe A.
Richards Glenn L.
Cooper William C.
Marvin William A.
Porter, Jr. William F.
Stromberg-Carlson Corporation
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