Transparent error detection in half duplex modems

Details Transparent error detection in half duplex modems Transparent error detection in half duplex modems

1985-07-05

1988-05-10

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 49, 375 58, H04L 100

Patent

active

047440929

ABSTRACT:
A modem is operated in a half-duplex mode having various elements which are trained on data and which are locked up while data is not exchanged, thereby eliminating the need for a preamble. A preamble is used if the period between successive transmissions exceeds a preselected threshold. In addition, a parity encoder is used to calculate a parity word for each transmission, said parity word being inserted in the first baud period of the next transmission. This first baud period is usually empty because data signals have not been received yet from the corresponding data transmission equipment.

REFERENCES:
patent: 3147460 (1964-09-01), Scott
patent: 3192362 (1965-06-01), Cheney
patent: 4263670 (1981-04-01), Sherman

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