Multi-channel cordless telephone system for maintaining master-s

Details Multi-channel cordless telephone system for maintaining master-s Multi-channel cordless telephone system for maintaining master-s

1992-04-20

1994-12-20

Kuntz, Curtis

Telephonic communications

Audio message storage, retrieval, or synthesis

379 62, 455 341, H04M 1100

Patent

active

053751639

ABSTRACT:
A cordless telephone provided with a master unit and a slave unit which use a plurality of communication channels. In the case where information indicating a currently used channel or a usually used channel, which has been stored in the master unit, is lost due to, for instance, a power failure, the master unit comes to use an initially used channel, which is preset or determined by performing an operation on an identification code, and enters a standby state. At that time, the slave unit uses the usually used channel. However, when it is detected that the slave unit cannot communicate with the master unit, the slave unit calls the master unit by using the initially used channel. Then, the master and slave units come to perform, for example, an exchange of confirmation data by using the initially used channel. Next, the slave unit transmits to the master unit data indicating that the channel used by the master unit should be changed to the usually used channel. In response to the data, the master unit made to use the usually used channel. Consequently, both of the master and slave units come to use the usually used channel and are able to communicate with each other. Thus, the cordless telephone does not require another power source for a backup circuit. Further, the circuit configuration of the cordless telephone becomes simple.

REFERENCES:
patent: 4694485 (1987-09-01), Iwase
patent: 4811380 (1989-03-01), Spear
patent: 5212808 (1993-05-01), Su et al.
patent: 5247567 (1993-09-01), Hirano
Bauer, H. P.: Schnurloses Telefon fur den 900-MHz-Bereich, in: ntz, vol. 38, No. 7, 1985, pp. 468-471.
MPT 1375 Common Air Interface Specification, Department of Trade and Industry, London, 1989, pp. i-4-26, Annexes & Appendixes.

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