Cordless key telephone system for repeating attempts to alert st

Details Cordless key telephone system for repeating attempts to alert st Cordless key telephone system for repeating attempts to alert st

1992-09-21

1994-04-19

Ng, Jin F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

455 334, H04M 1100, H04Q 700

Patent

active

053053710

ABSTRACT:
In a cordless key telephone system where adjacent service zones having the same control channel are overlapped, forming an unavoidable interference-affected overlapping zone, a main unit initially selects an access unit from each service zone in response to an incoming call from a network and transmits a first alert signal to that unit where it is broadcast to elicit an acknowledgement (ACK) signal from cordless stations. On receiving it, the access unit selects a speech channel, broadcasts a first channel assignment signal on the control channel, and then a first ringing signal on the selected speech channel. The main unit determines whether there is a cordless station falling to respond to the first alert signal. If such a station exists, the main unit selects a first, idle access unit which is located in one of the adjacent service zones. A second alert signal is then broadcast on a control channel from the first access unit. Following receipt of an ACK signal from a cordless station, a second channel assignment signal is broadcast from the first access unit, signalling the identification of a speech channel previously selected by a second, initially selected access unit located in the adjacent service zones. A second ringing signal is broadcast from the second access unit on the previously selected speech channel.

REFERENCES:
patent: 4672608 (1987-06-01), Ball et al.
patent: 4829554 (1989-05-01), Barnes et al.
patent: 5131010 (1992-07-01), Derrerge et al.
patent: 5218716 (1993-06-01), Comroe et al.

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