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Category 5 cable that is partially stripped and showing its four twisted pairs (eight wires). Category 5 cable (Cat 5) is a twisted pair cable for computer networks.Since 2001, the variant commonly in use is the Category 5e specification (Cat 5e).
The current revision includes Category 5e (100 MHz), 6 (250 MHz), 6A (500 MHz), and 8 (2,000 MHz). Categories 7 and 7A were not officially recognized by TIA and were generally only used outside the United States. Category 8 was published with ANSI/TIA‑568‑C.2‑1 (June 2016) [9] to meet the performance specification intended by Category 7.
Since common Category 5 cable has four pairs, it is possible to use the spare pairs (pins 4–5, 7–8) in 10- and 100-Mbit/s configurations for other purposes. The spare pairs may be used for power over Ethernet (PoE), for two plain old telephone service (POTS) lines, or for a second 10BASE-T or 100BASE-TX connection.
An 8P8C modular plug. This is the common crimp-type plug, of the same kind pictured above crimped onto a cable (with molded sleeve). A modular connector is a type of electrical connector for cords and cables of electronic devices and appliances, such as in computer networking, telecommunication equipment, and audio headsets.
4B5B MLT-3 coded signaling, Category 5 cable using two twisted pairs. The specifications are largely borrowed from FDDI's TP-PMD. [12] As of 2018, still very popular. 100BASE-T4: 802.3u-1995 (23) 8P8C (IEC 60603-7) 8B6T PAM-3 coded signaling, Category 3 cable (as used for 10BASE-T installations) using four twisted pairs. Limited to half-duplex.
Class I channel (Category 8.1 cable): minimum cable design U/FTP or F/UTP, fully backward compatible and interoperable with Class E A (Category 6 A) using 8P8C connectors; Class II channel ( Category 8.2 cable): F/FTP or S/FTP minimum, interoperable with Class F A (Category 7 A ) using TERA or GG45 .
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