Data transmission system

Details Data transmission system Data transmission system

1977-01-31

1978-08-29

Safourek, Benedict V.

Telegraphy

Systems

Line-clearing and circuit maintenance

H04L 700

Patent

active

041105583

ABSTRACT:
A data-transmission system using a continuous ARQ system, wherein a block (word) synchronization code is transmitted through a transmission line from a transmitter to a receiver repeatedly at a predetermined time interval, until the transmitter receives a signal (ACK) denoting the detection of the synchronization code from the receiver. Upon receipt of the synchronization code detection signal, the transmitter issues data blocks each having a fixed length to the receiver continuously from the point of time at which the succeeding synchronization code is to be transmitted. In the invention a predetermined number of test data blocks are further transmitted to the receiver in succession to the synchronization code. The receiver examines a block error rate concerning the test data blocks and supplies the transmitter with not only the synchronization code detection signal but also a data rate-specifying signal. The transmitter delivers data at a rate dependent on the data rate-specifying signal.

REFERENCES:
patent: 3006999 (1961-10-01), Mason
patent: 3534264 (1970-10-01), Blasbalg et al.
patent: 4027243 (1977-05-01), Stackhouse et al.

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