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For example, RJ11, RJ14, and RJ25 are the most commonly used interfaces for telephone connections for one-, two-, and three-line service, respectively. Although these standards are legal definitions in the United States, some interfaces are used worldwide.
A standard Swedish telephone plug carries one telephone line and has four flat metal pins and one plastic pin. The design is used only by Televerket (now Telia Company) in Sweden and older Póstur og Sími (now Síminn) installations in Iceland (RJ11 and a data/voice standard using an 8P8C modular connector are used in more recent buildings).
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.
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 ...
Typically it will have 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 line, unlike RJ11, which uses pins 3 and 4).
Their names are derived from the telephone plugs used for connecting telephone calls in manual switchboards. One side of the line is connected to the metal tip of the plug, and the second is connected to a metal ring behind the tip, separated and insulated from the tip by a non-conducting material. When inserted into a jack, the plug's tip ...
Looking at the variety of RJ11 and RJ14 telephone cables that I have for connecting from the wall socket to the actual phone, most (but not all!) seem to be wired with the pair wiring reversed from one end to the other: pins 3/4 will be red/green at one end and green/red at the other. I am assuming that ordinary telephone equipment expects this.
A CPE can be an active equipment, as the ones mentioned above, or passive equipment such as analog telephone adapters (ATA) or xDSL-splitters. This includes key telephone systems and most private branch exchanges. Excluded from the CPE category are overvoltage protection equipment and pay telephones. Other types of materials that are necessary ...
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