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For example, RJ11 and RJ14 use female six-position modular connectors, and RJ21 uses a 25-pair (50-pin) miniature ribbon connector. RJ11 uses two conductors in a six-position female modular connector, so can be made with any female six-position modular connector, while RJ14 uses four, so can be made with either a 6P4C or a 6P6C connector.
The cubic design was changed to a round version (No. 505A) in the mid 1960s. The four-prong jack and plug combination was the standard line connection for all portable telephone sets until the conversion to modular jacks in the 1970s, typified by the Registered Jack standards promulgated in U.S. federal law.
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The height of the plug's insertion area is 0.260 inches (6.60 mm) and the contacts are 0.040 inches (1.02 mm) apart (contact pitch), so the width is dependent on the number of pin positions. [ 7 ] [ 8 ] However, not all plugs from all manufacturers have this capability, and some jack manufacturers warn that their jacks are not designed to ...
The third pin (top, horizontal) used to be connected to ground and was occasionally used with switchboards, but is now generally unused and left unconnected [citation needed]. Each pin is 12.5 millimetres (0.5 in) long, 10 millimetres (0.4 in) wide and about 2 millimetres (0.08 in) thick, compatible with one of the historic types of blade plugs .
The A leg goes to pin 5 and the B leg to pin 2 in the master socket. (Although all equipment will work with a reversed line, so a reverse wired socket is not strictly a fault.) When current is flowing on the line, the B leg voltage collapses to nearer ground and the A leg voltage moves nearer to the B leg voltage. The exact voltage drop is a ...
Download as PDF; Printable version; In other projects ... Version 1.2 or any later version published by the Free Software ... An RJ11 Jack. 20:21, 30 December 2006:
The number gives their outer screw thread diameter in millimeters as with the identically named screws. However, the connectors are further classified by a so-called coding, denoted by one or more letters, which defines things like pin layout, shape of connecting surfaces and electrical properties. [2] [3]