Private branch exchange having a central control unit and a mobi

Telephonic communications – Audio message storage – retrieval – or synthesis

Patent

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379 58, H04Q 726

Patent

active

055442269

ABSTRACT:
A private branch exchange (PABX) with an integrated mobile part for controlling cordless terminals (HS) is established, which can be operated from base stations (BS).
The private branch exchange (PABX) contains freely configurable interface modules (I/F) for wired (DE) and cordless (HS) terminals, which can be operated from a base station (BS). A central control unit (PABX-CPU) is provided to control all call handling and service feature control tasks, and a subordinate control unit (Mobile-CPU) for call setup and switch-off control of the cordless terminals (HS) in accordance with a set of assigned call numbers. The control units (PABX-CPU, Mobile-CPU) and the interface modules (I/F) are connected with each other through a bus system (BUS).

REFERENCES:
patent: 4843622 (1989-06-01), Yotsutani et al.
patent: 4905237 (1990-02-01), Voelzke
patent: 5090051 (1992-02-01), Muppidi et al.
patent: 5157710 (1992-10-01), Itoh
Airwaves, architecture and tomorrow's PABX, by Douglas Postlethwaite, "Communications International," May, 1990. pp. 59-67.
Communitation et Transmission Bd 7, Nr. 2, 1985, Paris Fr. Seiten 39-50 Cueugniet und Duplessis Radiocom 2000 Reseau multiserve de radiotelephonie Seite 43 mittlere Spalte-Seite 44.
"A Business Cordless PABX Telephone System on 8800 MH2 Based on the Dect Technology" by Colin Buckingham et al IEEE Communications Magazine, Jan. 1991.

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