Transmission Report

           

      There is a types of transmission like coaxial cable, optical fiber, microwave antennas, satellite,..etc  , this transmission mediums used to carry the voice signal after transformed to electric signal ,the signal came from mobile station to BTS then the signal modulated and up-down conversion had happen to it then the signal sent to the audio (microwave antenna) through IF cable then the signal go in its way to BSC the signal will received by the audio of the BSC the received signal level (RSL) for the received signal must its RSL less than (-60 dB), if the RSL equal or greater than (-90)dB that means the two audios not seen each others because of weather or there is no alignment between them for some reason, the alignment should happen between tow audios to be able to send and receive from each other, or other problem may happens like noise ,free space losses (FSL), attenuation , rain attenuation, ..etc, and   there is multipath losses it happens because the alignment between the audios blocked by terrestrial objects so it should take another way, the fade margin between (-45_-90)dB, some of these audios has a backup audios, if the damage happen, when the first one goes down the second one handle the process there is two ways of setting a backup  hot standby (HSB) and space diversity (SD), as the distance increase between the audios the frequency should decrease and vice versa, and there is upper (U) and lower (L) microwave units according .to the frequency of transmitting and receiving frequency