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These interfaces use the same six-position modular connector body but have different numbers of pins installed. RJ11 is a jack, a physical interface, by definition used for terminating a single telephone line. RJ14 is similar, but for two lines, and RJ25 is for three lines. RJ61 is a similar registered jack for four lines, but uses 8P8C connectors.
Cords connecting to an RJ11 interface require a 6P2C connector. Nevertheless, cords sold as RJ11 often use 6P4C connectors (six position, four conductor) with four wires. Two of the six possible contact positions connect tip and ring, and the other two conductors are unused. RJ11 is commonly used to connect DSL modems to the customer line.
The naming confusion section refers to RJ11 as "six-position" and then in the next sentence "The four-position RJ-11". The picture labels the four pin plug as "RJ11". What the picture labels "RJ11" is in fact a six position plug. And it has 4 pins. The two outermost slots in the plug don't have pins in them. Hence, this is a "6P4C modular plug."
We really need to keep RJ11 intact. We just bought a V02 data acquisition system to measure metabolic rates during stress tests. This is pretty state-of-the-art equipment and it uses an RS-232 interface. The best way to drive this from a laptop is to use an RJ11 to RS-232 cable. It won't work with a USB to RS-232 adapter.
In North America no adapter is needed for certain uses: With ports wired in the preferred standard T568A pattern, for the 6P2C plugs most commonly used for single-line phone equipment (e.g. with RJ11), and 6P4C plugs used for two-line phones without power (e.g. with RJ14) and single-line phones with power (again RJ11), telephone connections are ...
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 ...
WASHINGTON (Reuters) -A massive winter storm moving across the United States will not keep the U.S. Congress from meeting on Monday to formally certify Republican Donald Trump's election as ...
Position Pair T/R ± 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
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