Abstract: A wireless communication system by using an electric power line as a data link network is disclosed. The system includes a plurality of primary wireless communication modules, a plurality of secondary wireless communication modules. Each of the primary wireless communication modules includes a data communication device coupled to a data link port of a controller, and a filter coupled between the data communication device and the electric power line. The system status memories of the primary wireless communication modules are synchronized to each other by transmitting the system status data therebetween according to a predetermined communication protocol on a selected communication channel through the electric power line.

Abstract: A wireless communication system by using an electric power line as a data link network is disclosed. The system includes a plurality of primary wireless communication modules, a plurality of secondary wireless communication modules. Each of the primary wireless communication modules includes a data communication device coupled to a data link port of a controller, and a filter coupled between the data communication device and the electric power line. The system status memories of the primary wireless communication modules are synchronized to each other by transmitting the system status data therebetween according to a predetermined communication protocol on a selected communication channel through the electric power line.

Abstract: A data base synchronization method of cordless communication sites is disclosed. The data base synchronization method includes steps of: a calling site sending a data base synchronization request signal via a selected communication channel to at least one called site; the called site scanning and receiving the data base synchronization request signal and sending the status data stored in the memory thereof to the calling site so that the status data of the calling site can be synchronized with the status data of the called site. The synchronization method provides data base synchronization of cordless communication modules of several base sites and handset sites so that in a whole cordless communication system or a whole data network system, no matter the communication is performed from a base site to another base site, a base site to a handset site, a handset site to a base site, or a handset site to another handset site, the data base synchronization is performed of the calling sites and called sites.