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08 Telecommunications
Telecommunications systems are built on copper . Twisted copper wires are used in ADSL and HDSL wiring for local area network ( LAN ) internet lines . Unshielded twisted pair ( UTP ) lines contain eight colour-coded conductors , which are constructed of four pairs of thin copper wires . Despite the current increase in wireless technology , modems , routers and other interface devices remain dependent on copper .
FEBRUARY 2020