Channel switching network

Details Channel switching network Channel switching network

1980-11-25

1982-10-05

Pitts, Harold I.

Communications: electrical

Continuously variable indicating

With meter reading

179 18GF, H04Q 352

Patent

active

043530664

ABSTRACT:
A channel switching network, in which each cross-point of a switch matrix is constituted as a channel switch of balanced type using two PNPN semiconductor elements. Each of the two PNPN semiconductor elements is arranged in a forward direction with respect to a direct current flowing from the channel switching network to a corresponding terminal equipment. A column of cross-points and a line of cross-points in the switch matrix are designated to select a simultaneously designated cross-point in response to a pair of selection signals. A control circuit is provided for each pair of the incoming lines and the outgoing lines of the switch matrix so that the terminal voltage of a power source for flowing the direct current in the PNPN elements is controlled to temporarily rise to turn ON the PNPN elements at the selected cross-point and thereafter to drop to such a value as only to maintain the PNPN elements in the ON states.

REFERENCES:
patent: 3688051 (1972-08-01), Aagard
patent: 3694812 (1972-09-01), Enomoto
patent: 4025726 (1977-05-01), Matsuyama

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