for time-division multiplexing

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Selecting arrangements for multiplex systems > for time-division multiplexing

CPC:

Selecting arrangements for multiplex systems (multiplex systems H04J) > for time-division multiplexing

CPC subdivides this area 3x more granularly than IPC with 3 additional codes.

3 codes are CPC-only extensions.

IPC defines codes here since 1990.

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H04Q 11/0407 +1 CPC CPC only CPC only
H04Q 11/0421 CPC only CPC only
H04Q 11/0428 +2 CPC CPC only CPC only
H04Q 11/06 Time-space-time switching since 1990 IPC+CPC Available in IPC and CPC
H04Q 11/08 Time only switching since 1990 IPC+CPC Available in IPC and CPC