Digital cordless telephone system for a private automatic branch

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels

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Details

370524, 370522, 370419, 370420, 455465, 455554, 455555, H04J 312, H04L 1228, H04L 1256

Patent

active

060211385

ABSTRACT:
A digital cordless telephone system comprises a multiplicity of subscriber cordless handsets (HS's) with a subscriber number of a private automatic branch exchange (PABX) being assigned to one or more of the HS's, a plurality of base stations (BS's), each of the BS's being coupled with one or more of the HS's by radio channels for controlling a radio link between each of the BS's and each of the HS's, and a system connecting unit coupled with the BS's and the PABX for allowing only authenticated HS's to initiate outgoing calls and for keeping track of each of the HS's to set up calls for the HS's whenever the HS's are within the service area of one of the BS's.

REFERENCES:
patent: 4975939 (1990-12-01), Sasaki
patent: 5259017 (1993-11-01), Langmantel
patent: 5416779 (1995-05-01), Barnes et al.
patent: 5442684 (1995-08-01), Hashimoto et al.
patent: 5473668 (1995-12-01), Nakahara
patent: 5493605 (1996-02-01), Akiyama et al.
patent: 5544226 (1996-08-01), Weis et al.

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