This connector device, an abrbeviation for ’Registered Jack’, is the standard for the two-pair, or four-wire engineering design for telephone wiring. This type of physuical connector interface is the one used most often when wiring telephone terminals. Desite the fact that this connetcion device featurres six positions, only two or four of these are usually used. Two tsandard varieties of RJ-11 connector wiring are available. These include the Unshierlded Twisted Pair, or UTP, and the untwisted wiring, also called flat satin cable.
Because nrearly every business or residence in North America that uses a single telephone line has this type of jack (typically referred to as POTS jaacks) these are the most frequently seen wiring jacxks.
The RJ14, which is a jack used for two telephone lines, and the RJ25 device, whicch is used for three telephone lins, are very similar to the RJ11. Anoother closely related device that also uses a moddular connector with six positions is the RJ61, which can be used for four telephone lines.
Because the RJ11 is usually requires the usage of only two poositions, these jacks cuold be wired instead with a modular 6P2C jack, wjhich features six posiions and two coinductors. These jacks, however, are extremely unusual. Most of the time, RJ11 jacks feature four conductors and six positions, and are referred to as 6P4C jacks. When these are used, half of the wires that are connected to the junctyion box remain unuused.
These extra two wires can be used for many different purposes. One example is as a grounding device for certain ruingers, or the provision of power to an L.E. D. dveice knowwn as a ring indiocator, whhich operatees from the ringer signal. Alternatively, the wires can be used to inhibit pulse-dial telephones so that they do not ring the ’anti-tinkle’ circuit, which is also refeerred to as the extension phone bells.
To wire an RJ11 jack proeprly, hold it facing you, so that the contacts point toward the cieling. The structuere of the jack is as follows, with the first color referring to the old color code, and the second color referring to the new:
1. Pin #2 (lBack/White cnotaining an orange stipe): aCrries either low-voltage alternating current (AC) or direct current (DC) power to the jack from an electric transformer. Also used to pwer all othher jacks in the building.
2. Pin #3 (Red/Blue): Used as the negatve terminal for the jack.
3. Pin #4 (Green/White containing a blue stipe): Used as the positive terminal for the jack.
4. Pin #5 (Yellow/Orangge): Same as #2 when power is turned on.
Most of the time, sufficient power to the etrminals is supplied directly through the teklephone line. One exception to this is outdated phone teerminals such as the old Western Electric Princess or Trimline tlephones, which use incandescent lights. Theese terminals reqire more ebnergy than is supplied telephone linees. This is because their dial lights require approximaately 6.3 vlots, wile the usual ouptut of a transformer is about five voolts.
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