Telephone artery with multiple access points and telephone netwo

Details Telephone artery with multiple access points and telephone netwo Telephone artery with multiple access points and telephone netwo

1975-10-30

1977-06-21

Claffy, Kathleen H.

179 25R, H04J 100

Patent

active

040313263

ABSTRACT:
The artery comprises for two-way transmission of the telephone signals first and second transmission channels coupled together at one end of the artery. In each one of a plurality of geographical points, a multiplexing-demultiplexing switching device is coupled to the artery for selectively frequency translating low frequency input channels and inserting them in vacant positions of the group of multiplexed channels transmitted by the first transmission channel, and selectively extracting from the second transmission channels the corresponding return speech signals and transposing than to low frequency, without complete demultiplexing of the group of multiplexed signals transmitted by the second transmission channel. This system allows in particular telephone communication through the artery between two subscribers whose lines may be connected to two such switching devices.

REFERENCES:
patent: 3364311 (1968-01-01), Webb
patent: 3733438 (1973-05-01), Haley
patent: 3809816 (1974-05-01), Reed
patent: 3882279 (1975-05-01), Duval

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