| 摘要 |
PROBLEM TO BE SOLVED: To always monitor a fraudulent act for a game machine and identify fraudulent modification of a main board without increase in costs. SOLUTION: An optical communication channel-monitoring loop that starts from a monitor device through a plurality of game machine main boards 20 and returns to the monitor device is formed of an optical cable. The cable and the main boards are connected so that the optical connection channel is blocked when a fraudulent act is committed on the main board. The main board includes: an optical communication subscriber line network device (ONU) 5 capable of conducting bidirectional optical communication for sending/receiving optical signals to and from the monitor device; a first splitter 3a for splitting the optical communication channel from one direction of the bidirectional optical communication channel into the channel to the ONU and to those to other game machines; a second splitter 3b for relaying the channel from a reverse direction; and a first and second optical signal monitoring circuits M1 and M2 connected with the first and the second splitters via the channel, respectively, both monitoring circuits sensing whether or not the channel is blocked in one/reverse directions. The main board fraudulently modified is identified by sensing blocking of the bidirectional optical communication channel. COPYRIGHT: (C)2010,JPO&INPIT |
