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A cable in this usage cable is a thick rope or by transference a chain cable. [1] The OED gives quotations from c. 1400 onwards. A cable's length (often "cable length" or just "cable") is simply the standard length in which cables came, which by 1555 had settled to around 100 fathoms (600 ft; 180 m) or 1 ⁄ 10 nautical mile (0.19 km; 0.12 mi). [1]
The phase velocity at which electrical signals travel along a transmission line or other cable depends on the construction of the line. Therefore, the wavelength corresponding to a given frequency varies in different types of lines, thus at a given frequency different conductors of the same physical length can have different electrical lengths.
When used for 10/100/1000BASE-T, the maximum allowed length of a Cat 6 cable is 100 meters (328 ft). This consists of 90 meters (295 ft) permanent link, which is typically solid horizontal cabling between two connectors, often the patch panel and the wall jack, plus 10 meters (33 ft) total of stranded patch cordage. [14]
The maximum length for a cable segment is 100 meters (330 ft) per TIA/EIA 568-5-A. [31] If longer runs are required, the use of active hardware such as a repeater or switch is necessary. [ 32 ] [ 33 ] The specifications for 10BASE-T networking specify a 100-meter length between active devices. [ 34 ]
The technology was standardized in 1982 [1] as IEEE 802.3. 10BASE5 uses a thick and stiff coaxial cable [2] up to 500 meters (1,600 ft) in length. Up to 100 stations can be connected to the cable using vampire taps and share a single collision domain with 10 Mbit/s of bandwidth shared among them. The system is difficult to install and maintain.
Data rate versus line length chart, from RS-422 Annex A.1. Several key advantages offered by this standard include the differential receiver, a differential driver and data rates as high as 10 megabits per second at 12 meters (40 ft). Since the signal quality degrades with cable length, the maximum data rate decreases as cable length increases.
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