Two-way operation using the same type of signal, i.e. duplex

Introduced: September 1968

Full Title

Arrangements affording multiple use of the transmission path > Two-way operation using the same type of signal, i.e. duplex

CPC subdivides this area 5x more granularly than IPC with 7 additional codes.

7 codes are CPC-only extensions.

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H04L 5/1407 CPC only CPC only
H04L 5/1415 CPC only CPC only
H04L 5/1423 CPC only CPC only
H04L 5/143 CPC only CPC only
H04L 5/1438 +2 CPC CPC only CPC only
H04L 5/1461 CPC only CPC only
H04L 5/1469 +2 CPC CPC only CPC only
H04L 5/16 Half-duplex systems; Simplex/duplex switching; Transmission of break signals IPC+CPC Available in IPC and CPC
H04L 5/18 Automatic changing of the traffic direction IPC+CPC Available in IPC and CPC