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A registered jack (RJ) is a standardized physical network interface — both jack construction and wiring pattern — for connecting telecommunications or data equipment to a service provided by a local exchange carrier or long distance carrier. The standard designs for these connectors and their wiring are named RJ11, RJ14, RJ21, RJ48, etc. Many of these interface standards are commonly used in North America, though some interfaces are used world-wide.* x2 k* G' F. `4 i8 G! ?
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The physical connectors that registered jacks use are mainly of the modular connector and 50-pin miniature ribbon connector types. For example, RJ11 uses a 6 position 4 conductor (6P4C) modular plug and jack, while RJ21 uses a 50-pin miniature ribbon connector.
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RJ11C/RJ11W: for one telephone line (6P4C with power on second pair)
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RJ45S: 8P2C + keyed, for one data line with programming resistor |
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狗仔卡
发表于 2010-4-24 10:26
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
显身卡
