Electronic switching system

Details Electronic switching system Electronic switching system

1978-02-16

1979-04-17

Stewart, David L.

179 15A, 179 18FG, H04Q 518

Patent

active

041502582

ABSTRACT:
In a telephone exchange system comprising a time division exchange system and space division concentrators connected to said exchange system with a PCM lines, said concentrators are controlled by said exchange system, thus those volume of hardware in the concentrators can be considerably reduced. Said concentrator comprises a space division switching network having self-latched electronic contacts, which are controlled by a periodical drive pulse from a cyclic readout type memory.

REFERENCES:
patent: 1488690 (1924-04-01), Lundquist
patent: 1540419 (1925-06-01), Powell
patent: 2892037 (1959-06-01), Feiner
patent: 3458659 (1969-07-01), Sternung
patent: 3601547 (1971-08-01), Potter
patent: 3725863 (1973-04-01), Freimanis
patent: 3778555 (1973-12-01), Nordling
patent: 3821484 (1974-06-01), Sternung
patent: 3863033 (1975-01-01), Chen

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