Dual speed full duplex data transmission

Details Dual speed full duplex data transmission Dual speed full duplex data transmission

1976-11-01

1978-01-17

Robinson, Thomas A.

Telegraphy

Systems

Printing

178 3, 179 2DP, 179 4, H04Q 500, H04M 1106

Patent

active

040693929

ABSTRACT:
A dual-speed, dual format full-duplex two-wire voiceband data transmission system provides automatic speed selection at the answering terminal responsive to a handshaking sequence which is compatible with existing systems operating at telegraph speeds. Existing systems provide asynchronous full-duplex serial data transmission in the speed range of zero to 300 bits per second using frequency-shift keying of tones in split frequency bands dedicated to the respective transmisson directions. Alternative full-duplex serial data transmission at 1200 bits per second using phase-shift keying of carrier waves in these same split frequency bands can now be provided from a common line protocol.

REFERENCES:
patent: RE27864 (1974-01-01), Davis et al.
patent: 3113176 (1963-12-01), Doktor et al.
patent: 3457550 (1969-07-01), Gibson et al.
patent: 3609241 (1971-09-01), Riethmeier
patent: 3937882 (1976-02-01), Bingham
patent: 4000371 (1976-12-01), Ogawa

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