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[[File:rj14wiring.gif]][[File:ph_eight-strand.png]]When polarity is concerned, the RED and YELLOW are considered the HOT or POSITIVE.For a D-Mark the telco 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.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.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.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]]