DIFF Subgroup
H04M 1/76 Compensating for differences in line impedance
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Substation equipment, e.g. for use by subscribers > Interface circuits for coupling substations to external telephone lines > Compensating for differences in line impedance
CPC:
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) > Compensating for differences in line impedance
No child classifications to compare. This is a leaf node in both IPC and CPC.