Digital telephone system

Details Digital telephone system Digital telephone system

1989-07-18

1991-05-07

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 9, 370 56, 379 93, 379 94, 379 97, 379 98, 379334, H04M 300, H04L 900

Patent

active

050143158

ABSTRACT:
A digital telephone system, having a through-switching module connected by its inputs/outputs to "1" subscriber concentration modules, each with group subscriber inputs/outputs connected via remote subscriber modules to groups of telephone sets. The telephone sets are digital telephone sets with inputs/outputs connected to individual subscriber inputs/outputs of remote subscriber modules via digital individual subscriber lines to provide transmission and reception of digitally coded information.

REFERENCES:
patent: 3941947 (1976-03-01), Jacob et al.
patent: 4201889 (1980-05-01), Lawrence et al.
patent: 4327436 (1982-04-01), Ohara et al.
patent: 4357701 (1982-11-01), Canniff
patent: 4571721 (1986-02-01), Yasui et al.
Siemens, Digital Electronic Switching System EWSD, 1987, (In Russian).
Telenokia, The DX=200 Electronic ATX, 1985, FInland, (In Russian).

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