H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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1/00
Arrangements for detecting or preventing errors in the information received
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H04L1/16
in which the return channel carries supervisory signals, e.g. repetition request signals
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H04L1/1607
Details of the supervisory signal
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