Telephonic communications – Subscriber line or transmission line interface
Patent
1990-11-19
1994-02-01
Dwyer, James L.
Telephonic communications
Subscriber line or transmission line interface
370 941, 379 28, 379377, H04M 906
Patent
active
052838277
ABSTRACT:
A digital line card for interfacing a remotely located digital telephone to a central office system by a two-wire connection is disclosed. The digital line card consists of a line interface connected to the two-wire connection. The line interface provides a full duplex transmission link with the remotely located digital telephone over the two-wire connection. A buffer is connected between the line interface and the central office system. The buffer converts data between the line interface and the central office system. The line card further comprising a protocol controller connected to the line interface. The protocol controller performs a packet protocol for communications with the remotely located telephone. To complete the line card, there is provided a processor connected to the protocol controller and to the central office system, under the direction of the central office system, the processor controls the operation of the digital line card and, through the protocol controller means, communicates with and controls the remotely located digital telephone.
REFERENCES:
patent: 4432089 (1984-02-01), Wurzburg et al.
patent: 4642805 (1987-02-01), Dumas et al.
Baca Anthony J.
Bissonnette Thomas C.
Conforti Joseph A.
AG Communication Systems Corporation
Dwyer James L.
Hendricks Gregory G.
Shehata M.
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