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Cross section of a cat 5e cable. The Category 5e specification improves upon the Category 5 specification by further mitigating crosstalk. [9] The bandwidth (100 MHz) and physical construction are the same between the two, [10] and most Cat 5 cables actually happen to meet Cat 5e specifications even though they are not certified as such. [11]
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.
The significance of each category or class is the limit values of which the Pass/Fail and frequency ranges are measured: Cat 3 and Class C (no longer used) test and define communication with 16 MHz bandwidth, Cat 5e and Class D with 100 MHz bandwidth, Cat 6 and Class E up to 250 MHz, Cat6A and Class EA up to 500 MHz, Cat7 and Class F up to 600 ...
Copper twisted pair cabling, star topology – direct evolution of 1BASE-5. As of 2024, still widely supported. 10BASE-Te: 802.3az-2010 (14) 100 m Cat-5: Energy-efficient Ethernet variant of 10BASE-T using a reduced amplitude signal over Category 5 cable, completely interoperable with 10BASE-T nodes. 10BASE-T1L: 802.3cg-2019 (146)
5 °C (9.0 °F) with only two pairs active, at I max: 10 °C (18 °F) with all of the bundled cables pairs active, at I max [36] 10 °C (18 °F) with temperature planning required Supported cabling Category 3 and Category 5 [27] Category 5 [27] [note 2] Supported modes Mode A (from Endpoint PSE), Mode B (from Midspan PSE) Mode A, Mode B
Category 3 cable was suitable for telephone circuits and data rates up to 16 million bits per second. Category 5 cable, with more restrictions on attenuation and cross talk, has a bandwidth of 100 MHz. [7] The 1995 edition of the standard defined Categories 3, 4, and 5.
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Common for current LANs. Superseded by Cat 5e, but most Cat 5 cables meet Cat 5e standards. [18] Limited to 100 m between equipment. Cat 5e: UTP, [18] F/UTP, U/FTP [19] 100 MHz [18] 1000BASE-T, 2.5GBASE-T [18] Enhanced Cat 5. Common for current LANs. Same construction as Cat 5, but with better testing standards. [18] Limited to 100 m between ...