The system for identification of telephone wire lines

Fixed telephone networks are based on copper wires. A lot of the twisted-pairs wires are the main transmission medium used in local telephone access networks to connect telephones or computers and other communication devices to the local exchange offices. The tangled wires run inside and outside of buildings, on telephone poles and in underground pipes but after all telecommunication operators must be able to identify the telephone subscriber number assigned to any desired pair of wires. The system presented below is solution of the problem by using GSM technology. The developed system is very simple but it assures very fast identification of the subscriber numbers at relatively low costs.