When data transmission is to be conducted between a master station and a slave station, the master station moves the other slave stations to such a park mode (standby state) that they do not make a communication request. Thus the master station and the slave station can conduct data transmission from...http://www.google.de/patents/US20020026492?utm_source=gb-gplus-sharePatent US20020026492 - Communications equipment that carries out communication within network having plural pieces of communications equipment
