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The 66 punch down block is a style of cross-connect device used in telephone installations utilizing 25-pair wiring. It consists of 50 rows of wire pinching posts arranged on a narrow rectangular block of plastic. The installer uses an impact punch-down tool with a tip that is specific to the 66 style. "Punching" involves placing the wire against the post and pushing it into a v-shaped slot in the post with the punch-down tool. The punch-down tool cuts the wire as it "bottoms out" against the plastic block. The 110 punch down block is a later style of cross-connect device designed for use in datacommunications installations. Similar in concept and basic shape to the 66, it has 100 or 200 rows of smaller wire pinching posts that are also arranged on a narrow block of plastic. The punch-down tool uses a 110 tip for the smaller size posts, and operates in the same manner as does the 66. The 110 punch down block utilizes 4- or 5-pair connector blocks to patch ethernet signals between various lines in the network using 110 wiring plugs in the ends of patch cables. Various mounting options for both the 66 and 110 allow for alternate arrangements, either on a flat surface found in a typical communications closet, or in a rack mount cabinet.
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