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Twisted-pair cabling was invented by Alexander Graham Bell in 1881. [4] By 1900, the entire American telephone network was either twisted pair or open wire with transposition to guard against interference. Today, most of the twisted pairs in the world are outdoor landlines, owned and maintained by telephone companies, used for voice service.
Since 1995, solid-conductor unshielded twisted pair (UTP) cables for backbone cabling is required to be no thicker than 22 American Wire Gauge (AWG) and no thinner than 24 AWG, or 26 AWG for shorter-distance cabling. This standard has been retained with the 2009 revision of ANSI TIA/EIA 568.
(E.g. two 14 AWG wires have about the same cross-sectional area as a single 11 AWG wire.) This doubles the conductance. When the diameter of a solid round wire is doubled, the AWG will decrease by 6. (E.g. 1 mm diameter wire is ~18 AWG, 2 mm diameter wire is ~12 AWG, and 4 mm diameter wire is ~6 AWG).
Category 6 cable (Cat 6) is a standardized twisted pair cable for Ethernet and other network physical layers that is backward compatible with the Category 5/5e and Category 3 cable standards. Cat 6 must meet more stringent specifications for crosstalk and system noise than Cat 5 and Cat 5e. The cable standard specifies performance of up to 250 ...
Each diameter was multiplied by 0.890526 to give the next lower size. This is now the American wire gauge (AWG), and is prevalent in North America and used to some extent in over 65 countries, with a market share of about 30% of all power and control wires and cables. [3]
The colors of the wire pairs in the cable, in order, are blue (for pair 1), orange, green, and brown (for pair 4). Each pair consists of one conductor of solid color and a second conductor, which is white with a stripe of the other color. The difference between the T568A and T568B pinouts is that pairs 2 and 3 (orange and green) are exchanged.