Digital private automatic branch exchange

Details Digital private automatic branch exchange Digital private automatic branch exchange

1974-10-08

1976-08-31

Olms, Douglas W.

179 18AD, H04J 300

Patent

active

039782905

ABSTRACT:
A private automatic branch exchange utilizing PCM (pulse code modulated) digital technology with a four wire non-blocking PCM network having an ability to provide a double (three port) connection for each inlet, on a digital basis is disclosed. As a result of the network various new functional arrangements are possible. The application of PCM for implementing PABX systems provides an opportunity to interface directly with a PCM trunk thereby eliminating the PCM to analog code conversion.

REFERENCES:
patent: 3492430 (1970-01-01), Vigliante
patent: 3740484 (1973-06-01), Laggy et al.
patent: 3761624 (1973-09-01), Lewis et al.
patent: 3804989 (1974-04-01), Carbrey
patent: 3828146 (1974-08-01), Lewis
patent: 3885103 (1975-05-01), Smith et al.

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