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The visual difference from the more-common 8P female is subtle. The RJ45S keyed 8P modular connector has only pins 5 and 4 wired for tip and ring (respectively) of a single telephone line, and a "programming" resistor connected to pins 7 and 8. [10] [11] [12]
The distances that single pair operates at full duplex depends on the speed: 1000m (1km) with 802.3cg-2019 10BASE-T1L; 15 m or 49 ft with 100BASE-T1 (link segment type A); up to 40 m or 130 ft using 1000BASE-T1 link segment type B with up to four in-line connectors. Both physical layers require a balanced twisted pair with an impedance of 100 Ω.
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]
CX4/SFF-8470/IEC 61076-3-113 Designed to support short distances over copper cabling, it uses InfiniBand 4x connectors and CX4 twinaxial cabling and allows a cable length of up to 15 m. Was specified in IEEE 802.3ak-2004 which has been incorporated into IEEE 802.3-2008. Shipping has all but stopped in favor of 10GBASE-T and SFP+ direct attach.
The connector provides power to the keyboard on the outer two contacts and receives data signals on the inner pair. The cable between the computer and the keyboard is a coiled cord with an appearance very similar to a telephone handset cable. [11] The connector on the Amiga 1000 uses crossover wiring, similar to a telephone handset.
For example, telephone cables in the UK typically have a BS 6312 (UK standard) plug at the wall end and a 6P4C or 6P2C modular connector at the telephone end: this latter may be wired as per the RJ11 standard (with pins 3 and 4), or it may be wired with pins 2 and 5, as a straight-through cable from the BT plug (which uses pins 2 and 5 for the ...
Because the only difference between the T568A and T568B pin and pair assignments are that pairs 2 and 3 are swapped, a crossover cable may be envisioned as a cable with one modular connector following T568A and the other T568B (see TIA/EIA-568 wiring). Such a cable will work for 10BASE-T or 100BASE-TX.
The registered jack or modular jack in RJ11, RJ45 and other similar connectors used for telecommunications and computer networking; The telephone jack of manual telephone switchboards, which is the socket fitting the original 1 ⁄ 4 inch (6.35 mm) telephone plug
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