Functions of some active and passive components of GSM base station such as transceiver (TRx), power amplifiers (PA), combiners, duplexers, antennas, alarm extension system, function of control, the baseband receiver (BBxx), the signal DSP, the main distribution board, the rectifier and the environmental monitoring unit (EMU) are discussed in [20]. Other components discussed are DC ventilation system, air conditioning, generators, BTS cabinet, transmission rack, microwave antenna, aviation light and fiber optic/coaxial cable. GSM transmitter measurement for the base transceiver station and its components. The measurements were performed on active components of the BTS GSM. and their components from [21]. He explained that GSM standards define radio communication systems that function properly only if each component operates within precise limits. Base stations must transmit sufficient power, with sufficient fidelity to maintain a call of acceptable quality, without transmitting excessive power in the frequency and time slot assigned to others. Some factors responsible for interference have been identified such as: spectrum due to modulation and broadband noise, spectrum due to switching and spurious transmitter and receiver bandwidth. The need to pay attention to the sensitivity of the BTS receiver was also highlighted [21].Overview of the latest developments of standards in human exposure to electromagnetic fieldsElectromagnetic radiation is produced by the antennas of the GSM base station, the permissible levels of radiation are regulated by the a country's communications commission following guidelines and standards produced by standards organizations such as; International Commission on Non-Ionizing Radiation Protection (ICNIRP) and Institute of Electrical and Electronics Engineers (IEEE)... center of sheet... radio equipment, switches, antennas, transceivers for signal processing, both BTS and gateway, fiber optic network and backbone, transmission and all other electronic systems and components of the mobile network. Passive infrastructure encompassing non-electronic infrastructure, including, but not limited to, towers, shelters, air conditioning equipment, generator sets, battery banks, electrical supply, plant rooms, rest rooms and pylons, accounting for nearly 60 % of network implementation costs [6]. For categorization see Table 2.1 below. Table 2.1: Mobile infrastructure components [6]Active components Passive components1. Base Station 1. Tower2. Microwave radio equipment 2. Shelters3. Switches 3. Power supply4. Antennas 4. Relaxation room5. Transceivers 5. Conduits6. Fiber optic network 6. Right of passage of cables Passive sharing of infrastructure