Cabling - Twisted PairTwisted pair cabling is a type of wiring in which two conductors
of a single circuit are twisted together for the purposes of cancelling out electromagnetic interference (EMI) from external sources; for instance, electromagnetic radiation from unshielded twisted pair (UTP) cables, and cross-talk between neighboring pairs. It was invented by Alexander Graham Bell. |
Input - KeyboardModern keyboards have alphanumeric keys and other buttons for
special functions. A typical keyboard has more than 100 keys, including the number pad, function keys F1 through F12 and operation buttons like the keys marked CTRL, TAB, ALT and DEL. The most popular layout, the QWERTY is not a universal standard; other keyboard layouts may be used for special purposes. |