RJ-11
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RJ-11 is a physical interface often used for terminating twisted pair type cables. RJ stands for Registered Jack which is part of the United States Code of Federal Regulations. It has six positions with 4 pins (electrical connections) installed at positions 2,3,4 and 5.
Telephone signal polarisation and cable wiring in RJ-11, RJ-61/8P8C, RJ-25/6P6C, RJ-14/6P4C and RJ-11/6P2C Wiring
| 8P8C | 6P6C | 6P4C | 6P2C | Pair | Wire | T/R | +/- | Color | Old |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 4 | 1 | T4 | + | Missing image Pair_4_wire_1_horizontal_stripe.png Pair 4 Wire 1 white/brown | Missing image White.png Pair 4 Wire 1 white (or slate) | |||
| 2 | 1 | 3 | 1 | T3 | + | Missing image Pair_3_wire_1_horizontal_stripe.png Pair 3 Wire 1 white/green | Missing image Orange.png Pair 3 Wire 1 orange | ||
| 3 | 2 | 1 | 2 | 1 | T2 | + | Missing image Pair_2_wire_1_horizontal_stripe.png Pair 2 Wire 1 white/orange | Missing image Pair_2_wire_1_horizontal_old.png Pair 2 Wire 1 Old black | |
| 4 | 3 | 2 | 1 | 1 | 2 | R1 | - | Missing image Pair_1_wire_2_horizontal_stripe.png Pair 1 Wire 2 blue/white | Missing image Pair_1_wire_2_horizontal_old.png Pair 1 Wire 2 Old red |
| 5 | 4 | 3 | 2 | 1 | 1 | T1 | + | Missing image Pair_1_wire_1_horizontal_stripe.png Pair 1 Wire 1 white/blue | Missing image Pair_1_wire_1_horizontal_old.png Pair 1 Wire 1 Old green |
| 6 | 5 | 4 | 2 | 2 | R2 | - | Missing image Pair_2_wire_2_horizontal_stripe.png Pair 2 Wire 2 orange/white | Missing image Pair_2_wire_2_horizontal_old.png Pair 2 Wire 2 Old yellow | |
| 7 | 6 | 3 | 2 | R3 | - | Missing image Pair_3_wire_2_horizontal_stripe.png Pair 3 Wire 2 green/white | Missing image Blue.png Pair 3 Wire 2 blue | ||
| 8 | 4 | 2 | R4 | - | Missing image Pair_4_wire_2_horizontal_stripe.png Pair 4 Wire 2 brown/white | Missing image Brown.png Pair 4 Wire 2 brown |
(T4 means 4th pair's tip wire, R2 means 2nd pair's ring wire, etc.)
Most telephones are "single line" telephones and only connect to the center 2 pins ("line 1"), the red and green wires. "Two-line" telephones are also fairly common—one pushes a button to switch between "line 1" (the center 2 pins) and "line 2" (the outer pins).
Note that while the old solid color code was well established for pairs 1 and 2, there are several conflicting conventions for pairs 3 and 4. The colors shown above were taken from a vendor of "silver satin" flat 8-conductor phone cable that claims to be standard. At least one other vendor of flat 8-conductor cable uses the sequence blue, orange, black, red, green, yellow, brown and white/slate.
Note also that the flat 8-conductor "silver satin" cable traditionally used with 4-line analog telephones is completely unsuitable for use with Ethernet even though both applications use the RJ-45 8-position connector. Twisted pair cable and the pairings given in TIA-568A/B (which are different from the pairings shown above) must be used with Ethernet.
Because most residences are wired with the full 4-wire cable, but many only have the "inner pair" actually connected to anything, LocalTalk was designed to use only the "outer pair," the black and yellow wires.
See also
- BS 6312
- RJ, RJ-14, RJ-25, RJ-61, RJ-45
- 6P2C, 6P4C, 6P6C, 8P8C
- Telephones
- Plain old telephone service
- Twisted pair
- 25-pair color code
External links
- The Basics of Telephone Wiring (http://telecom.hellodirect.com/docs/Tutorials/TelWiringBasics.1.040401.asp)
- Home Phone Wiring Advice Page (http://www.homephonewiring.com/)
- Doing your own telephone wiring (http://www.ling.upenn.edu/~kurisuto/phone_wiring.html)
- Connecting a second phone line (http://www.hometech.com/learn/hdi11.html)
- 8-conductor Silver Flat Phone Cable (http://st4.yahoo.com/lib/webtronics/60-298ul.jpg)
