| 摘要 |
PROBLEM TO BE SOLVED: To prevent reduction in communication efficiency due to increase of traffic or the like. SOLUTION: Communication equipment S1 ,... are connected to a power line W for supplying power to each playing board in a pachinko shop or the like, plural communication networks N1 ,... are composed in which data or the like produced from each playing board are communicated by using the power line W through these communication equipment S1 ,... and repeaters (master modems) M1 ,... and a router R are provided to the communication networks, for conducting the communication among these plural communication networks. In the case that more than two retrials have been conducted in each of the communication equipment S1 ,..., channels used for the communication are changed from usual channels f1 ,... into standby channels f3 ,.... That is, since the standby channels f3 ,... are not usually used, and therefore the communication efficiency is high, even when the communication efficiency is reduced in the usual channels f1 ,..., due to data collision, noise or the like through the repetitive retrials, so that the communication channels are changed into the standby channels f3 ,... for attaining high-speed communication. |
