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PCE
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DIFF Subgroup
H04M 3/02

Calling substations, e.g. by ringing (selective calling H04Q)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Calling substations, e.g. by ringing

CPC: Calling substations, e.g. by ringing (selective calling H04Q)

Full Title

Full titles differ between systems:

IPC:

Automatic or semi-automatic exchanges > Calling substations, e.g. by ringing

CPC:

Automatic or semi-automatic exchanges > Calling substations, e.g. by ringing (selective calling H04Q)

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

Child Classifications

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  • H04M 3/04 the calling signal being supplied from the final selector IPC+CPC Available in IPC and CPC
  • H04M 3/06 the calling signal being supplied from the subscriber's line circuit IPC+CPC Available in IPC and CPC