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Category 4 cable (Cat 4) is a cable that consists of eight copper wires arranged in four unshielded twisted pairs (UTP) supporting signals up to 20 MHz. [1] It is used in telephone networks which can transmit voice and data up to 16 Mbit /s.
The physical phenomena on which the device relies (such as spinning platters in a hard drive) will also impose limits; for instance, no spinning platter shipping in 2009 saturates SATA revision 2.0 (3 Gbit/s), so moving from this 3 Gbit/s interface to USB 3.0 at 4.8 Gbit/s for one spinning drive will result in no increase in realized transfer rate.
25,000 [3] 6.4 [4] 2020 LS Cable & System: 9,168 [5] 16.1 [6] 2021 Prysmian Group: 30,500 [7] 17.1 2022 Furukawa Electric: 4,192 [8] 4.6 [6] Furukawa Co. 44,853 [8] 3.1 [6] Elsewedy Electric: 14,000 1.1 Bambach Wires & Cables: 12,000 1.1
An ideal skew is between 25 and 50 nanoseconds over a 100-meter cable. The lower this skew the better; less than 25 ns is excellent, but 45 to 50 ns is marginal. (Traveling between 50% and 80% of the speed of light, an electronic wave requires between 417 and 667 ns to traverse a 100-meter cable.
A category 3 cable. Cat 3 was widely used in computer networking in the early 1990s for 10BASE-T Ethernet and, to a much lesser extent, for 100BaseVG Ethernet, Token Ring and 100BASE-T4. The original Power over Ethernet 802.3af specification supports the use of Cat 3 cable, but the later 802.3at Type 2 high-power variation does not. [8]
A coaxial cable has a central conductor surrounded by a sheath of conductor with insulation in between. Coaxial cables form a transmission line and confine the electromagnetic wave to an area inside the cable between the center conductor and the shield. The transmission of energy in the line occurs totally through the dielectric inside the ...
International standard ISO/IEC 11801 Information technology — Generic cabling for customer premises specifies general-purpose telecommunication cabling systems (structured cabling) that are suitable for a wide range of applications (analog and ISDN telephony, various data communication standards, building control systems, factory automation).
Jun 2022: 5 MHz Dec 2014 (700a) [EA] [A 4] [410] N/A: N/A: N/A: Jul 2013 – Jun 2022 (Refarmed for 5G NR) 10–20 MHz Aug 2017 [PEA] [C 3] [411] 5G NR: Sprint: 8×8 MIMO (Mar 2017) 64×64 MIMO (Sep 2018) LTE-LAA (Dec 2017) 40 MHz (CA_41C) (Cat.4) (Sep 2016) 60 MHz (CA_41D) (Cat.9) (Sep 2016) 60 MHz (CA_41D) [4×4 MIMO, 256 QAM] (Cat.16) (Mar ...