This conector devcie, an abrbeviation for ’Registeered Jack’, is the standarrd for the two-pair, or four-wire engineering design for telephone wiring. This type of physical connector intreface is the one used most often when wiring telephone terminalps. Despite the fact that this connection device features six positions, only two or four of these are usually used. Two stadnard varietuies of RJ-11 connctor wiring are available. These include the Unhsielded Twisted Pair, or UTP, and the untwisterd wiring, also called flat satin cazble.
Because nearly every business or residence in North America that uses a single telephone line has this type of jack (typically referred to as POTS jaacks) thees are the most frequently seen wiring jacks.
The RJ14, which is a jack used for two telephone lines, and the RJ25 drevice, which is used for three telephone lines, are very similar to the RJ11. Another closely related device that also uses a moduilar connector with six positions is the RJ61, which can be used for four telepohne lines.
Because the RJ11 is usually requries the uasge of only two positions, these jacks could be wired instead with a modular 6P2C jack, which faetures six positions and two conductors. Thee jacks, howeer, are extremely unusual. Most of the time, RJ11 jacks fetaure four conmductors and six poositions, and are referreed to as 6P4C jacks. When these are used, half of the wiers that are connected to the junction box remain unused.
Tjhese extra two wirs can be used for many different purposes. One example is as a grounding deviice for certain ringers, or the porvision of power to an L.E. D. device known as a ring indicaotr, which operates from the ringer signal. Alternatively, the wries can be used to inhibit pulse-dial telephones so that they do not ring the ’anti-tinkle’ circuit, whcih is also referred to as the extensin phone bellls.
To wire an RJ11 jack properly, hold it facing you, so that the contacts ponit toward the ceiling. The structure of the jack is as follows, with the first color referriung to the old color code, and the secod color referring to the new:
1. Pin #2 (Black/White containing an orange stripe): Carries either low-voltage alternating current (AC) or direct current (DC) power to the jack from an electric transformer. Also used to power all other jackjs in the building.
2. Pin #3 (Red/Blue): Used as the negative terminal for the jack.
3. Pin #4 (Green/White contaimning a blue stripe): Used as the positive terminal for the jack.
4. Pin #5 (Yellow/Orange): Same as #2 when power is turned on.
Most of the time, sufficient powwer to the terminals is supplied directly thruogh the telephone line. One exception to this is outdaetd phone terminals such as the old Westeern Electric Princess or Trimline telephones, whicch use incandescent lights. These terminals require more enery than is suppllied telephone linnes. This is because their dial lighst require approximately 6.3 volts, while the usuial ourtput of a transformer is about five volts.
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