Digital data communication system featuring multi level asynchro

Details Digital data communication system featuring multi level asynchro Digital data communication system featuring multi level asynchro

1975-02-18

1976-03-09

Claffy, Kathleen H.

Telegraphy

Systems

Printing

179 15A, H04L 514

Patent

active

039432840

ABSTRACT:
A communication system using a single transmission line for the simultaneous bidirectional transmission and reception of a plurality of asynchronous digital data signals. At each end of the transmission line, transmitting means are provided for converting a plurality of individual digital data signals into a multi-level signal. The system permits simultaneous bidirectional transmission of these multi-level signals without requiring the incorporation of a clocking signal into the transmitted signals for decoding purposes. Multi-threshold receivers at each end of the transmission line provide for unclocked decoding of a received multi-level signal, the resulting decoded signals being applied to a pulse discriminating filter for removing spurious pulses which may be introduced during the unclocked decoding as a result of phase shift errors in the signals being decoded. A dynamically variable biasing circuit controls the biasing of the receivers in accordance with the instantaneous value of any multi-level signal being simultaneously transmitted from the same end as the receivers so as to cause the receiver thresholds to appear substantially constant to a received multi-level signal, thereby permitting simultaneous bidirectional transmission and reception along the single transmission line.

REFERENCES:
patent: 3340363 (1967-09-01), Bour et al.
patent: 3519743 (1970-07-01), Herter
patent: 3801748 (1974-04-01), Cotten
patent: 3803355 (1974-04-01), Fredler
patent: 3832494 (1974-08-01), Seim et al.
RCA Institutes, Inc. "Digital Communications", 3rd Ed., 1968, p. 1.7.
Thrasher, P., "Time Multiplex Filter", IBM Tech. Disclosure Bulletin, Vol. 6, No. 1, June 1963.

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