Cordless telephone with in-range monitoring

Details Cordless telephone with in-range monitoring Cordless telephone with in-range monitoring

1987-12-16

1989-08-01

Lev, Robert

Telephonic communications

Audio message storage, retrieval, or synthesis

379 63, H04Q 704

Patent

active

048539511

ABSTRACT:
To verify that the handset of a cordless telephone unit is still within the radio coverage area of the fixed station, rather than attempt to establish connection with the switched network and verify contact as a result of receiving a dial tone, or dialing a special number in the network, a user can merely activate a radio coverage verification circuit in the handset and fixed station. Through use of these circuits, in addition to the identification number of the station, a code is transmitted. The identification and code, when received by the opposite station, are verified with number and code values stored in that station, and the number and code are then retransmitted as an acknowledgement signal. An annunciator in the handset provides a visual or aural warning to the user if the acknowledgement signal is not received, indicating that the handset is not within the radio coverage area of the fixed station.

REFERENCES:
patent: 4574163 (1986-03-01), Zato
patent: 4700375 (1987-10-01), Reed

Affiliated with

Also associated with

Rating

Cordless telephone with in-range monitoring does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cordless telephone with in-range monitoring, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cordless telephone with in-range monitoring will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-137519