1978-04-03
1979-11-13
Brigance, Gerald
179 15BY, H04J 312, H04M 1702
Patent
active
041744683
ABSTRACT:
A circuit which allows a digital network telephone central office to provide coin telephone service without analog-to-digital converters. This circuit controls the transmission of digital data representative of coin telephone control signals. Shift registers are used to store this data for asynchronous transmission to a coin telephone, under control of gating logic circuits which insert one bit periodically in preselected frames of data sent to a coin telephone.
REFERENCES:
patent: 3278693 (1966-10-01), Sherstiuk
patent: 3456081 (1969-07-01), Pharis et al.
patent: 3760112 (1973-09-01), Busch
patent: 3970799 (1976-07-01), Colton et al.
patent: 4010328 (1977-03-01), McGuire
Bell System Technical Journal, Oct. 1972, pp. 1701-1712, "D2 Channel Bank: Digital Functions".
Brigance Gerald
GTE Automatic Electric Laboratories Incorporated
Hendricks Gregory G.
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