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The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. [1] Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. [2]
A keystone module is a standardized snap-in package for mounting a variety of low-voltage electrical jacks or optical connectors into a keystone wall plate, face plate, surface-mount box, or a patch panel. Keystone modules have a rectangular face of 14.5 mm wide by 16.0 mm high and are held in place with flexible tabs.
C: flush-mount or surface mount; F: flex-mount; W: wall-mount; L: lamp-mount; S: single-line; M: multi-line; X: complex jack; For example, RJ11 comes in two forms: RJ11W is a jack from which a wall telephone can be hung, while RJ11C is a jack designed to have a cord plugged into it. A cord can be plugged into an RJ11W as well.
GG45 (GigaGate 45) and ARJ45 (Augmented RJ45) are two related connectors for Category 7, Category 7 A, and Category 8 telecommunication cabling. The GG45 interface and related implementations are developed and sold by Nexans S.A. , while the ARJ45 interface and related implementations are developed and sold by Bel Fuse Inc.
Typically the male connector is fitted to a cable, and the female to a panel on equipment. Cable connectors are often designed to be fitted by crimping [ 9 ] using a special power or manual tool. [ 10 ] [ failed verification ] Wire strippers which strip outer jacket, shield braid, and inner dielectric to the correct lengths in one operation are ...
However, switching equipment that can emulate the capabilities of a given patch bay is much more expensive. For example, an S-Video matrix routing switcher with the same capability (8×8) as a 16-point S-Video patch panel (8 patch cables connects 8 inputs and 8 outputs) may cost ten times more, though it would probably have more capabilities.
For twisted-pair cabling 8P8C, modular connectors are used (often called RJ45 in this context). For fiber, a variety of connectors are used depending on manufacturer and physical space availability. With 10BASE-T and 100BASE-TX, separate twisted pairs are used for the two directions of communication.
A feedthrough is a conductor used to carry a signal through an enclosure or printed circuit board. Like any conductor, it has a small amount of capacitance . A "feedthrough capacitor" has a guaranteed minimum value of shunt capacitance [ clarify ] built in it and is used for bypass purposes in ultra-high-frequency applications. [ 1 ]
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