Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1992-07-30
1994-02-15
Ng, Jin F.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 61, H04M 1100
Patent
active
052874001
ABSTRACT:
In a communication control device which is operable in a standby mode or in an active mode and which is located between a cordless telephone set and a subscriber connected to the device through a telephone line to carry out communication therebetween by controlling a plurality of radio speech channels and a control channel assigned to the cordless telephone sets, a monitoring operation is carried out at a monitoring period to search for each idle radio speech channel with the number of the idle radio speech channels counted in the standby mode. The monitoring period is changed in dependence upon the number of the idle radio speech channels. Specifically, control is made so that the monitoring period becomes short when the number of the idle radio speech channels is small. This enables quick search for an idle radio speech channel even when an idle radio speech channel is not found.
REFERENCES:
patent: 4875231 (1989-10-01), Hara et al.
patent: 5044010 (1991-08-01), Frenkiel et al.
patent: 5157709 (1992-10-01), Ohteru
Cumming William D.
NEC Corporation
Ng Jin F.
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