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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H04L1/00 Arrangements for detecting or preventing errors in the information received
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H04L1/12 by using return channel
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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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