Dual speed full duplex data transmission

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

H - Electricity

03

L

340/84

H03L 5/00 (2006.01) H04L 5/14 (2006.01)

Patent

CA 1108262

DUAL SPEED FULL DUPLEX DATA TRANSMISSION Abstract of the Disclosure 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 compatable with existing systems operating at telegraph speeds. Existing systems provide asychronous 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 transmission 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.

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