Attendant board system in a telephone exchange

Details Attendant board system in a telephone exchange Attendant board system in a telephone exchange

1974-01-15

1976-06-29

Claffy, Kathleen H.

179 91R, H04Q 362

Patent

active

039670759

ABSTRACT:
An attendant board system in a telephone exchange in which when the direct connection type attendant board system is desired in connecting the office trunk and the attendant trunk, the office trunk and the attendant trunk are connected with each other directly, while when the channel access type attendant board system is desired, the office trunk and the attendant trunk are connected with each other through a channel switch frame. This change in the connection mode is performed by plugging in a direct connection type office trunk or a channel access type office trunk.

REFERENCES:
patent: 2813930 (1957-11-01), Berch
patent: 2872528 (1959-02-01), Kaye
patent: 3502816 (1970-03-01), Gerke
patent: 3542961 (1970-11-01), Klein
patent: 3660600 (1972-05-01), Lee, Jr.
patent: 3665112 (1972-05-01), Blake
"810A PBX Semiconductor Integrated Circuits and Hybrid Technology" by R. D. Burtness, International Conference on Communication, June, 1971, pp. 16-23 through 16-28.

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