Telegraphy – Systems – Line-clearing and circuit maintenance
Patent
1974-04-11
1976-02-10
Ruggiero, Joseph F.
Telegraphy
Systems
Line-clearing and circuit maintenance
178 58R, 178 66R, 179 2DP, 343175, 343179, H04L 514, H04M 1100
Patent
active
039378829
ABSTRACT:
The disclosed full-duplex communication system includes a pair of full-duplex modems, one at each end of a two wire circuit. Each of the modems includes a transmitter for transmitting over the two wire circuit a stream of synchronous data at a first carrier frequency, and a receiver for receiving over the two wire circuit a stream of synchronous data at a second carrier frequency. The receiver includes means for coherently demodulating the stream of synchronous data. In a preferred embodiment, an asynchronous-to-synchronous converter converts asynchronous input data into a stream of synchronous data for transmission by the transmitter. Also, the preferred embodiment transmits the data and receives the data as double side band suppressed carrier quadrature amplitude modulation. The system includes a remote test capability for automatically looping back test data for comparison with the transmitted test data.
REFERENCES:
patent: 3631497 (1971-12-01), Leonard
patent: 3655915 (1972-04-01), Liberman et al.
patent: 3715496 (1973-02-01), Jones, Jr.
patent: 3758719 (1973-09-01), Klose
patent: 3783194 (1974-01-01), Vilips et al.
patent: 3801912 (1974-04-01), Ragsdale
Krass Errol A.
Ruggiero Joseph F.
Vadic Corporation
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