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For example, a 900-pair cable has the first 600 pairs in 24 groups of 25 pairs in a white binder, and the remaining 300 pairs in 12 groups of 25 pairs wrapped in a red binder. [ 5 ] [ 6 ] Some cables are "mirrored" or "clocked" with a pattern that is known throughout the telephone industry.
Category 5 cable is used in structured cabling for computer networks such as Ethernet over twisted pair. The cable standard prescribes performance parameters for frequencies up to 100 MHz and is suitable for 10BASE-T, 100BASE-TX (Fast Ethernet), 1000BASE-T (Gigabit Ethernet), and 2.5GBASE-T. 10BASE-T and 100BASE-TX Ethernet connections require ...
Both cables are a similar standard to category 3 cable. [12] [13] Cables with categories 3 through 7 have 4 twisted pairs. [14] Prior to the common use of polyethylene and other plastics for insulation, telephone twisted pair cable was insulated with waxed paper or cotton with a wax coating applied to the copper.
A cable terminated according to T568A on one end and T568B on the other is a crossover cable when used with the earlier twisted-pair Ethernet standards that use only two of the pairs because the pairs used happen to be pairs 2 and 3, the same pairs on which T568A and T568B differ. Crossover cables are occasionally needed for 10BASE-T and ...
Four-position, four-contact (4P4C) plug, used for connecting a telephone handset and base. Six-position, six-contact (6P6C) jack, which could be wired as RJ11, RJ14, or RJ25. A registered jack ( RJ) is a standardized telecommunication network interface for connecting voice and data equipment to a computer service provided by a local exchange ...
The polarity of the DC supply may be inverted by crossover cables; the powered device must operate with either pair: spare pairs 4–5 and 7–8 or data pairs 1–2 and 3–6. Polarity is defined by the standards on spare pairs, and ambiguously implemented for data pairs, with the use of a diode bridge .
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