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Though the RJ-11 connector has a total of 6 connector positions, typically either only 2 or 4 are used.RJ-11 connector wiring comes in two standard types. There's (A) Untwisted and (B) Unshielded Twisted Pair. CAT5 connectors (RJ45) have 8 contacts (4 wire pairs); standard telephone jacks (RJ11) have 4 contacts (2 wire pairs). When using Cat5 use the center pair (Blue/Blue-white) in the CAT5 cable. Connect the CAT5 pair to the Red and Green on the standard phone jack.[[File:rj14wiring.gif]][[File:ph_eight-strand.png]]When polarity is concerned, the RED and YELLOW are considered the HOT or POSITIVE.== Punch Down Tool ==The punch down tool is an impact tool that pushes the wire into the metal receiver of the block and cuts off the excess wire. == Punch Down Block ==For a demarc is part of the [[Telephone System]] where the telephone company may use a Punch Down Block such as the 66 Block. Some installations pull a Cat.3 or Cat.5 cable in which has 4 pairs of wires and they are wrapped from top to bottom of the punch down, provide for 4 phone lines, multiple phone connections for each line all the way down the block.=== Bridging Clip ===Used on a punch down block to bridge the left side incoming connection to telephones or other telephony devices connected on the right side of the punch down block (via wired to jacks).=== Service Loop ===For a 66 block it is a good idea to have a service loop. Add an extra 2 feet and 2 inches for a service loop. The service loop is the extra wire you leave in the event that the punch down block needs rewired due to a problem with something like a broken wire. Without extra, it might be necessary for the entire drop to be replaced. The service loop is used wrapped at the bottom of the punch down block. ==Related== *[[Ethernet RJ45 Wiring Reference]] *[[Telephone RJ11 Wiring Reference]] *[[Telephone System]] *[[Telecommunication Jack]]