Multiplex communications – Wide area network – Packet switching
Patent
1985-06-26
1988-08-23
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 98, 379408, H04L 514
Patent
active
047665890
ABSTRACT:
In a data transmission system data is sent, after suitable conversion, as a ternary analog type signal. Using two-wire twisted pairs and hybrids, echo cancellation and feedback equalization are needed.
Synchronization between the two ends, e.g. of a 144 Kb/sec. subscriber's loop is maintained by a low amplitude pilot tone sent with the data, and detects at the same time as the data is detected. Detection and elimination of this pilot tone use coefficient generation circuitry similar to those used in the equalizer and echo canceller.
REFERENCES:
patent: 2965717 (1960-12-01), Bell
patent: 3401342 (1968-09-01), Becker
patent: 3404231 (1968-10-01), Aaron et al.
patent: 3772598 (1973-11-01), Van Gerwen
patent: 4103234 (1978-07-01), Frazier, Jr.
patent: 4209664 (1980-06-01), Hochrath
Griffin Robert L.
Huseman M.
STC PLC
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