PABX cordless telephone system

Details PABX cordless telephone system PABX cordless telephone system

1988-08-22

1990-02-27

Lev, Robert

Telephonic communications

Audio message storage, retrieval, or synthesis

379 63, H04Q 704

Patent

active

049052721

ABSTRACT:
A PABX cordless telephone system comprising a base station (10) and a plurality of handset (HS1 to HS5). The base station is connected to the public switching network and communicates with each handset by way of a respective duplex radio link. The operation of the PABX system is controlled by a micro-controller (16) in the base station. Micro-controllers are also present in each of the handsets. Security in the radio communication via the duplex radio links is provided by assigning an n-bit security address code, where n for example comprises 16 bits, to each handset. The signalling protocols in setting-up calls require the transmission of the full n-bit security code. In the interim periods the base station (10) carries out a security check on the handsets forming its system. Time, memory capacity in the micro-controllers and battery current can be saved while simultaneously achieving a high degree of security if the security check is carried out using m bits of the security codes where m<n and m is typically equal to 8.

REFERENCES:
patent: 4689812 (1987-08-01), Hata
patent: 4700375 (1987-10-01), Reed
patent: 4742560 (1988-05-01), Arai
Communication from the European Patent Office in a corresponding application.

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