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 titles differ between systems:

IPC:

Current supply arrangements for telephone systems

CPC:

Current supply arrangements for telephone systems (for selecting-equipment H04Q1/28)

Current supply for selection equipment

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.

Navigate with arrow keys, Enter to open

H04M 19/001 +4 CPC CPC only CPC only
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

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

Class H04,2013–2023, worldwide · Source: EPO PATSTAT