BTS-Base Transceiver Station is an interface between subscriber and the network. It consists mainly of TRX-transceivers, combiners and filters, and a digital switch unit-interface of the BS to the BSC through PCM(E1 or T1) and O&M functions. TX signals from TRX are combined by combiners to the antenna and RX signals received by the antenna are filtered by the filter combiner unit and distributed to TRX. That is for now only…. to be continued…..