IPC Subgroup
H04Q 3/54 in which the logic circuitry controlling the exchange is centralised
Introduced: September 1968
Last revised: January 2006
Full Title
Selecting arrangements > Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker > in which the logic circuitry controlling the exchange is centralised
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- SELECTING
Related Keywords
STORAGE of data in switching centres
2 direct subcodes
Child Classifications
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- H04Q 3/545 using a stored program
- H04Q 3/55 using wired logic circuitry