e room temperature rises above the specified limit then the equipment may fail to operate normally or lead to a burnout. Beyond a certain temperature threshold, the equipment guarantee may also cease to exist, SO every site is equipped with an operational and a redundant air conditioning unit. The cable trays guide the antenna feeders and other interconnecting cables. Cable trays are either hung from the ceiling of the equipment room or are mounted on thin poles of rods when they are placed outside, bringing the cables from the tower to the equipment room. All sites are fitted with mandatory fire and smoke alarms. These alarms are fed straight to the external alarm system, which transmits them to the network management centre. They are carried over the transmission or IP backbone. For security reasons, in every site there is a 'door alarm' connected to the external alarm system, notifying any kind of illegal entry into the sites. A.2.3 Site Planning and Equipment Installation A site survey is done to choose a technically viable solution for the whole team. The initial BTS con- figuration with required orientation, height and position of the antennas is given by the RF engineer, along with an estimate for future capacity expansions. The transmission engineer provides information regarding the number, type, position, height and orientation of the microwave dishes together with an Network Implementation indication of whether additional dishes will be required, when they might be required and their approx- imate orientation. The site engineering team works out the tower height and effective antenna loading with all safety factors involved. The site planners make a site layout, taking into consideration the sug- gestions of the RF planners, transmission planners, site engineers, etc., with all the equipment including future expansions and then an estimated bill of materials will be prepared. This technical site survey report is checked by the network and transmission planning teams and if accepted continues for furthe