| 摘要 |
PURPOSE:To assure a time for sure initializing in an MODEM, by performing the transmission of carrier after a prescribed time after the ending of carrier of the station itself or the carriers from other stations. CONSTITUTION:A carrier transmission circuit 21 transmits carrier by being indicated with a carrier transmission indicating signal from a CPU1. A reception carrier detection circuit 22 generates a detection signal when a carrier is present on a line 5. This detection signal is delayed at a delay circuit 24 and transmitted to a carrier transmission indicating signal control circuit 23. The circuit 23 gives a carrier transmission signal transmitted from the CPU1 to the circuit 21 only when no detection signal from the delay circuit 24 is present. As a result, since a time without carrier on the line 5 can be generated without fail, the initializing of an MODEM20 can be made. |
