A.C. Signal current transmission trunk circuit for telephone exc

Details A.C. Signal current transmission trunk circuit for telephone exc A.C. Signal current transmission trunk circuit for telephone exc

1979-01-31

1981-04-28

Brown, Thomas W.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

179 18AH, 179 51AA, 179 84A, 307252T, H03K 1756, H04M 1902

Patent

active

042647860

ABSTRACT:
An A.C. signalling transmission trunk circuit has a single-polarity drive voltage source for controlling a pair of thyristor-switching circuits which are assigned, respectively, to a subscriber line pair. The voltage source is arranged to supply either a positive or negative half-wave A.C. signal voltage over one side of the subscriber line to one of the thyristor-switching circuits. Another half-wave A.C. drive voltage of the same polarity (but 180 degrees out of phase) is applied over the other side of the subscriber line to the other of the thyristor-switching circuits. The instantaneous potentials on the two sides of the subscriber lines have single polarity--either a positive or a negative potential--while supplying the A.C. signal to the subscriber set.

REFERENCES:
patent: 3235669 (1966-02-01), Lanham
patent: 3247327 (1966-04-01), Lanham
patent: 3536852 (1970-10-01), Dolarmore
patent: 3808378 (1974-04-01), Hernandez
patent: 4021617 (1977-05-01), Jones, Jr.
patent: 4082923 (1978-04-01), Okuhara
"A Line Concentrator Using Electronic Crosspoints," by Suzuko et al., International Switching Symposium, Oct. 1976, Kyoto, Japan, 243-1-1 to 243-1-5.

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