A cellular cordless telephone may receive cellular telephone calls via a cellular telephone system and receive telephone calls on a system having a limited radio coverage area. To reduce the amount of time spent in monitoring the sub-data channel of the limited coverage area system, a timing signal is...http://www.google.fr/patents/US5442680?utm_source=gb-gplus-shareBrevet US5442680 - Dual system cellular cordless radiotelephone apparatus with sub-data channel timing monitor
Dual system cellular cordless radiotelephone apparatus with sub-data channel ...
