CPC Subgroup
H04J 3/02 Details (electronic switching or gating H03K17/00)
Full Title
Time-division multiplex systems (H04J14/00 takes precedence; relay systems H04B7/14; selecting techniques H04Q) > Details (electronic switching or gating H03K17/00)
7 direct subcodes
Child Classifications
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- H04J 3/04 Distributors combined with modulators or demodulators
- H04J 3/06 Synchronising arrangements
- H04J 3/08 Intermediate station arrangements, e.g. for branching, for tapping-off
- H04J 3/10 Arrangements for reducing cross-talk between channels
- H04J 3/12 Arrangements providing for calling or supervisory signals
- H04J 3/14 Monitoring arrangements