H04M 1/738 Interface circuits for coupling substations to external telephone lines (H04M1/78 takes precedence)
Introduced: January 2000
Title
Titles differ between systems:
IPC: Interface circuits for coupling substations to external telephone lines
CPC: Interface circuits for coupling substations to external telephone lines (H04M1/78 takes precedence)
Full Title
Full titles differ between systems:
Substation equipment, e.g. for use by subscribers > Interface circuits for coupling substations to external telephone lines
Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08) > Interface circuits for coupling substations to external telephone lines (H04M1/78 takes precedence)
Of 3 combined children, 2 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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- H04M 1/74 with means for reducing interference; with means for reducing effects due to line faults +1 CPC IPC+CPC Available in IPC and CPC