CPC Subgroup
H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
Full Title
Arrangements for detecting or preventing errors in the information received > by using return channel > in which the return channel carries supervisory signals, e.g. repetition request signals
2 direct subcodes
Child Classifications
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- H04L 1/1607 Details of the supervisory signal
- H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems