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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 standards for telephone jacks and plugs vary from country to country, though the 6P2C style modular plug has become by far the most common type. A connection standard, such as RJ11 , specifies not only the physical aspects of an electrical connector , but also the signal definitions for each contact, and the pinout of the device, i.e. the ...
On the plug, the contacts are flat metal bars positioned parallel to the connector body. Inside the jack, the contacts are metal spring wires angled away from the insertion interface. When the plug is mated with the jack, the contacts meet and create an electrical connection. The spring force of the jack contacts ensures a good interface.
The RJ11 female port provided on the filter case simply connects the DSL router directly to the phone line (most DSL filters have a socket marked DSL or ADSL that just connects the DSL line pair directly through to the incoming phone line pair via the BT plug, without any filtering or processing of any kind).
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."
twin 2-conductor plugs for use with type 91, and type 99 jacks—used for the operator's head telephone and chest transmitter (microphone) 109 3-conductor plugs for use with jack 92 on telephone switchboards (with the same basic shape as the modern Bantam plugs) 110 3-conductor plug for use with jacks 49, 117, 118, 140, and 141 on switchboards 112
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