Range extender with variable gain for coin telephone loops

Details Range extender with variable gain for coin telephone loops Range extender with variable gain for coin telephone loops

1980-11-28

1982-04-06

Brigance, Gerald L.

179 16F, H04M 1702

Patent

active

043237339

ABSTRACT:
A range extender with gain unit for coin telephone loops is disclosed. When coin control signals to be applied from a central office to the coin loop are detected, an amplifier circuit and a line feed circuit connected to the loop are disconnected thereby directly connecting the central office with the coin telephone. After coin control is completed, the amplifier and line feed circuit are reinserted into the coin loop. Coin tests and off-hook detection are aided by the use of circuits which draw current from the central office.

REFERENCES:
patent: 3843844 (1974-10-01), Schumperli
patent: 3872258 (1975-03-01), Chambers, Jr.
patent: 3906162 (1975-09-01), Sparrevohn
patent: 4031324 (1977-06-01), Dudonis
"A Circuit that Stretches Coin Telephone Service", Bell Laboratories Record, vol. 51, #4, Apr. 1973, Schillo.

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