Dial pulse detection

Details Dial pulse detection Dial pulse detection

1979-10-15

1981-09-15

Robinson, Thomas A.

179 16F, 179 18HB, 179170R, H04B 340

Patent

active

042899338

ABSTRACT:
The disclosure shows a telephone range extender which is automatically adaptable to the length of the connected subscriber loop. A loop resistance detector within the range extender discriminates between loops within a plurality of ranges of lengths. For extremely short loops not requiring range extension, the range extender circuits are disconnected from the loop. For intermediate length loops, the gain of a bidirectional voice frequency amplifier is set at a low value to provide just sufficient gain for these loops. For longer loops, the gain of the amplifier is increased to provide sufficient amplification for the longer range. For extremely long loops, the range extender is disconnected since such loops must be served by remote amplification facilities. An automatic range extender of this type is shown connected behind the first stage of the central office switch in order to concentrate range extenders on a larger plurality of subscriber loops.

REFERENCES:
patent: 3339027 (1967-08-01), Feiner et al.
patent: 3403228 (1968-09-01), Zebe
patent: 3671676 (1972-06-01), Henry et al.
patent: 3784756 (1974-01-01), Nemchik
patent: 3816668 (1974-06-01), Giesken
patent: 4004102 (1977-01-01), Ott
patent: 4056688 (1977-11-01), Stiefel

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