DIFF Main Group
H04M 19/00 Current supply arrangements for telephone systems (for selecting-equipment H04Q1/28)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Current supply arrangements for telephone systems
CPC: Current supply arrangements for telephone systems (for selecting-equipment H04Q1/28)
Full Title
Full titles differ between systems:
IPC:
Current supply arrangements for telephone systems
CPC:
Current supply arrangements for telephone systems (for selecting-equipment H04Q1/28)
Of 4 combined children, 3 exist in both systems.
1 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H04M 19/02 providing ringing current or supervisory tones, e.g. dialling tone or busy tone +2 CPC IPC+CPC Available in IPC and CPC
- H04M 19/06 in which current supply sources at subordinate switching centres are charged from the main exchange IPC+CPC Available in IPC and CPC
- H04M 19/08 with current supply sources at the substations (generating ringing current H04M19/04) IPC+CPC Available in IPC and CPC