by using return channel

Introduced: September 1968

Full Title

Arrangements for detecting or preventing errors in the information received > by using return channel

Of 3 combined children, 2 exist in both systems.

1 codes are CPC-only extensions.

Note: 1 CPC extensions are marked as secondary classification only.

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H04L 1/14 in which the signals are sent back to the transmitter to be checked IPC+CPC Available in IPC and CPC
H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals IPC+CPC Available in IPC and CPC
H04L 2001/125 2nd only CPC only CPC only