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Punch-down block
A punch-down block (also punchdown block, punch block, punchblock, quick-connect block and other variations) is a type of electrical connection often used in telephony. It is named because the solid copper wires are "punched down" into short open-ended slots which are a type of insulation-displacement connectors. These slots, usually cut crosswise (not lengthwise) across an insulating plastic bar, contain two sharp metal blades which cut through the wire's insulation as it is punched down. These blades hold the wire in position and make the electrical contact with the wire as well.
==Overview==
A tool called a punch down tool is used to push the wire down firmly and properly into the slot. Some will automatically cut any excess wire off 〔(Call recording blog, last accessed 30 Apr 2007 )〕 The exact size and shape of the tool blade varies by manufacturer, which can cause problems for those working on existing installations, especially when there is a poorly documented mix of different brands.
Punch-down blocks are a very quick and easy way to connect wiring, as there is no stripping of insulation and no screws to loosen and tighten. Punch-down blocks are often used as patch panels, or as breakout boxes for PBX or other similar key phone systems with a 50-pin RJ21 (Amphenol) connector.〔Versadial, (Call Recording Terms/Definitions ), last accessed 8 June 2015〕 They are sometimes used in other audio applications, such as in reconfigurable patch panels.
Often a separate tool known as a spudger is used to remove small stray pieces of cut off wiring stuck within punch-down blocks.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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