Optically coupled two-wire to four-wire hybrid lines

Details Optically coupled two-wire to four-wire hybrid lines Optically coupled two-wire to four-wire hybrid lines

1975-05-29

1976-10-19

Claffy, Kathleen H.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250199, H04B 158

Patent

active

039872572

ABSTRACT:
Two-wire telephone lines connecting between subscriber telephones and the central office telephone system are coupled to four-wire transmission lines within the central office by means of phototransistors and light emitting diodes. The use of the phototransistors and light emitting diodes provides two-wire to four-wire conversion between balanced two-wire lines.

REFERENCES:
patent: 3402297 (1968-09-01), Harris
patent: 3410961 (1968-11-01), Slana
patent: 3783198 (1974-01-01), Couch
patent: 3809908 (1974-05-01), Clanton
patent: 3842216 (1974-10-01), Owen et al.
patent: 3867580 (1975-02-01), Russell
patent: 3874780 (1975-04-01), Love
patent: 3878397 (1975-04-01), Robb et al.

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