By: Vlad Vistac
Submitted: 2010-07-22 16:22:52 | Word Count: 510
What is RJ-11?
This connector device, an abbreviation for ’Registered Jack’, is the stnadard for the two-pair, or four-wire engineering design for telephone wiring. This type of physical connector interfcae is the one used most oten when wriing telephone terminals. Despite the fact that this connection device features six positions, only two or four of these are usually used. Two standard varieties of RJ-11 connector witring are available. These include the Unshielded Twisted Pair, or UTP, and the untwisted woiring, also called flat satin cable.
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Becsause nearly ebvery business or residence in North America that uses a single telephone line has this type of jack (typically referred to as POTS jacks) these are the most frequently seen wriing jacks.
The RJ14, which is a jack used for two telephone lines, and the RJ25 device, which is used for three telephone lines, are very similr to the RJ11. Another closely related devicce that also uses a moudlar connector with six positioons is the RJ61, whihc can be used for four telephone lines.
Because the RJ11 is usually requires the usage of only two positions, tehse jacks could be wired instead with a modular 6P2C jack, wich features six positions and two coductors. These jacks, howeever, 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 wirers that are connected to the junctiopn box reman unused.
These extrra two wies can be used for many different purposes. One exazmple is as a gronding device for certain ringers, or the proviasion of power to an L.E. D. device known as a ring inndicator, which opwerates from the ringer siggnal. Alternatively, the wires can be used to inhibbit pulse-dial telephones so that they do not ring the ’anti-tinkle’ circuit, which is also referred to as the extension phoe bells.
To wire an RJ11 jack properly, hold it facing you, so that the coontacts poitn toward the ceiling. The structure 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 (Black/White containing an orane stripe): Carries eiither low-voltage alternasting currennt (AC) or diect current (DC) power to the jack from an elexctric transformer. Also used to powewr all other jacks in the building.
2. Pin #3 (Red/Blue): Used as the negative treminal for the jack.
3. Pin #4 (Greewn/White contaiing a blue stripe): Used as the positive terminnal for the jack.
4. Pin #5 (Yellow/Orange): Same as #2 when power is turnbed on.
Most of the time, sufficient power to the terminals is supplied directly through the telephone line. One exceptino to this is outdated phone termianls such as the old Western Electrric Princess or Trimlien telephones, whch use incandescent lights. Thgese terminals require more energy than is supplied telephone lines. This is because theuir dial lights requre approximately 6.3 volts, while the usual output of a transformer is abvout five volts.
