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RJ is an acronym for Registered Jack. Registered Jack type 11 is standard for telephone use in North America and many other parts of the world. There are registered jack designations from RJ11 to RJ48. Though the RJ-11 connector has a total of 6 connector positions, typically either only 2 or 4 are used.[[File:wiki_telephony01.jpg]]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]]