Patent
1984-09-19
1986-03-04
Brady, W. J.
179 2E, H04Q 704
Patent
active
045741646
ABSTRACT:
A base station (coast station) of such a radiotelephone system as a maritime mobile radiotelephone system is connected to a telephone exchange of a public telecommunication network. A ringing signal from a subscriber's station of the telecommunication network which is connected to the exchange is transmitted to an end station (ship station) of the radiotelephone system by way of the line concentrator and a radio section between the base and end stations. When a false calling tone signal is sent from a tone signal delivery circuit included in the line concentrator to an end station for a predetermined short period of time upon completion of a connection between the exchange and the end station, with no regard to a ringing signal from the exchange, a subscriber's telephone at the end station produces a calling tone. Thereafter, the line concentrator delivers a calling tone signal in synchronism with a ringing signal from the exchange. The telephone at the terminal station, therefore, produces a tone immediately after a connection has been completed, so that the subscriber at the end station is prevented from off-hooking during an interruption time of a calling tone to cause collision of receipt of a call and origination of a call.
REFERENCES:
patent: 3692952 (1972-09-01), Leonard
patent: 3906166 (1975-09-01), Cooper et al.
patent: 4320265 (1982-03-01), Biggiogera et al.
Brady W. J.
NEC Corporation
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