Bridge lifter circuit

Details Bridge lifter circuit Bridge lifter circuit

1981-01-09

1983-02-01

Brigance, Gerald L.

179 251, 179 17B, H04M 1300

Patent

active

043717551

ABSTRACT:
The tip and ring leads (15,17) of a tip party transmission facility are reversed before connecting the separate channel units for the tip and ring party channels to bridge lifters (16,18) at the central office, thus permitting selective ringing. Tip party identification for billing is provided by a tip-party indicator (20) inserted in the tip party transmission path at the central office by grounding the tip conductor when needed. The need for rewiring the tip party telephone set is then eliminated by providing separate single party channel units.

REFERENCES:
patent: 3073908 (1963-01-01), Hochgraf et al.
patent: 3189689 (1965-06-01), Hochgraf
patent: 3673330 (1972-06-01), Suntop et al.
patent: 3703610 (1972-11-01), Ebbe et al.
patent: 3881068 (1975-04-01), Jones, Jr. et al.
patent: 4310723 (1982-01-01), Svala

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