PURPOSE: To prevent a battery in a radiotelephony set from being considerably consumed by interrupting a set call channel forcibly when a non-reply time is monitored and no reply comes even in the case of exceeding a monitoring time upon the arrival of a call to a telephone circuit.
CONSTITUTION: In the case of the receipt of an incoming reply signal from radiotelephony sets 31-3m, a call channel is established between a connection device 21 and the radiotelephony sets 31-3m. When no reply comes from the radiotelephony sets 31-3m within a monitoring time (t) by a timer 102, CPU 101 of a master set 1 sends a standby signal to the connection device 21 at the point of time of the lapse of the monitoring time (t) by the timer 102 and the connection device 21 receiving the standby signal stops the transmission of a bell signal and sends a forced interruption signal to the call channel.
MISAWA HIROYUKI
KOBAYASHI KOZO
KUMATAKA SHINJI
ORIGASA HIROMI
HARA TOSHIHIRO
NIPPON TELEGRAPH & TELEPHONE
NEC CORP
| JPS6473844A | 1989-03-20 | |||
| JPH02182065A | 1990-07-16 |