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RJ11 RJ14 RJ25 Twisted pair colors 25-pair colors [A] Old colors [B] German colors [C] Australian colors Dutch colors [D] Diagram 1: 3: T + T3 white/green white/green white pink orange 6P6C connector showing the location of pin 1 2: 2: T + T2: T2 white/orange white/orange black green red orange 3: 1: R: −: R1: R1: R1 blue
For example, RJ11 and RJ14 use female six-position modular connectors, and RJ21 uses a 25-pair (50-pin) miniature ribbon connector. RJ11 uses two conductors in a six-position female modular connector, so can be made with any female six-position modular connector, while RJ14 uses four, so can be made with either a 6P4C or a 6P6C connector.
The 6P2C, 6P4C, and 6P6C modular connectors are probably best known for their use as RJ11, RJ14, and RJ25 non-powered registered jacks, respectively (and 6P4C and 6P6C for powered RJ11 and RJ14, power being delivered on the outer pairs). These interfaces use the same six-position modular connector body but have different numbers of pins installed.
For example, telephone cables in the UK typically have a BS 6312 (UK standard) plug at the wall end and a 6P4C or 6P2C modular connector at the telephone end: this latter may be wired as per the RJ11 standard (with pins 3 and 4), or it may be wired with pins 2 and 5, as a straight-through cable from the BT plug (which uses pins 2 and 5 for the ...
The picture identifying pin 1 of the modular connector is wrong. One arrow points to pin 1 and the other arrow points to pin 6. Both pointers are labeled as "pin 1"... which is physically impossible. —Preceding unsigned comment added by 76.90.211.240 23:37, 27 December 2009 (UTC) The arrows are correct, but the photo is not very clear.
The third pin (top, horizontal) used to be connected to ground and was occasionally used with switchboards, but is now generally unused and left unconnected [citation needed]. Each pin is 12.5 millimetres (0.5 in) long, 10 millimetres (0.4 in) wide and about 2 millimetres (0.08 in) thick, compatible with one of the historic types of blade plugs .
The number gives their outer screw thread diameter in millimeters as with the identically named screws. However, the connectors are further classified by a so-called coding, denoted by one or more letters, which defines things like pin layout, shape of connecting surfaces and electrical properties. [2] [3]
Pin 1 is typically indicated on the body of the connector by a red or raised "V" mark. The corresponding wire in a ribbon cable is usually indicated by red coloration, a raised molded ridge, or markings printed onto the cable insulation. On the connector pin 2 is opposite pin 1, pin 3 is next to pin 1 along the length of the connector, and so on.