The relations between the maximum communication distance and basic parameters (the radiation power of a transmitting antenna,the antenna s cross radius and the sensitivity of a receiving system),which influence the volume and weight of a system of intersatellite optical communications,are analyzed in theory.

Fiber- optic Communication with Carrier Wave Communication in High Pressure Circuit Difference Protection of Application Comparison;

Analysed the carrier communication technology based on X-10 protocol,and the principle of chirp modulation spread spectrum based on CEBus protocol.

Due to many drawbacks in handcopying meters, this article mainly describes copying meters in intelligence to copy meters by using of KQ100E,the module of power carrier communication We′ll introduce copying meters in intelligence system about configuration,theory,characters,and talk about the application of KQ100E the module of carrier receiving and transmittin