Telecoms engineers install, maintain and repair the equipment and connections used to carry voice and data communications. Their work may cover telephone lines, broadband connections, fibre-optic cabling, network sockets, routers, switches and internal wiring in homes, offices and other premises. Some engineers work on external networks and street-side infrastructure, while others focus on connections and equipment within buildings. Typical services include setting up new phone or internet connections, extending or reorganising cabling, testing signal quality and tracing faults such as loss of service, interference or slow data transmission. Engineers may replace damaged cables or components, configure network equipment and check that systems are working correctly after installation or repair. The precise work depends on the engineer's specialism and whether they serve residential customers, businesses or communications network operators.