PURPOSE: To eliminate the need to extend a relay line with a radio calling center through the expansion of the scale of service by applying time division multiplex to radio calling information incoming from plural trunk lines and sending it to a relay line from a data communication line.
CONSTITUTION: In calling different terminals simultaneously by plural telephone subscribers 1, plural calls come nearly simultaneously to incoming trunks (ICTs) 3-1∼3-n of a repeater 3, and a controller 3c reads sequentially respective section numbers and messages and sends the result to the relay line 5 from a data communication circuit 3b in time division multiplex. The transmission information length being the sum of the selection number and message altogether per one radio calling is nearly 20 characters and it is possible to send the information of plural trunk lines in time division multiplex through a single relay line of voice band.
TEZUKA TAKAO
MIURA OSAMU
SUGI KUNITOSHI
