| 摘要 |
PROBLEM TO BE SOLVED: To realize a directional route distributing function by modulating a descending signal on the side of a master station, modulating an ascending signal on the side of a slave station, supplying it to an ascending channel on a directional route with which the slave station is connected, demodulating the modulated descending signal on the side of the slave station and demodulating the modulated ascending signal by every directional route on the side of the master station. SOLUTION: A descending message 16 is received, in addition, when a message to other slave stations, the master station or the Internet exists, it is outputted as an ascending message 23 by a terminal 40. If no message exists, a 'no message' code is outputted as the ascending message 23. Pieces of access control information 11 to 14, a selection channel 33 and transmitting state information 31 are inputted and response information 32 is outputted by a response monitor 41. When the ascending message 23 is the 'no message' code or the selection channel 33 is a 'no selection' code, no ascending signal D2 is transmitted and the transmitting state information 31 is defined as 'no transmission' by an ascending modulator 45.
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