Ethernet over twisted pair - wikipedia Ethernet over twisted pair Ethernet over twisted - pair cable 8P8C plug Ethernet over twisted pair technologies use twisted - pair cables for the physical layer of an Ethernet computer network. They are a subset of all Ethernet physical layers. Early Ethernet had used various grades of coaxial cable, but in 1984, StarLAN showed the potential of simple unshielded twisted pair. This led to the development of 10BASE - T and its successors 100BASE - TX, 1000BASE - T and 10GBASE - T, supporting speeds of 10, 100 Mbit / s and 1 and 10 Gbit / s respectively. All these standards use 8P8C connectors, and the cables from Cat 3 to Cat 8 have four pairs of wires ; though 10BASE - T and 100BASE - TX only use two of the pairs. Contents 1 History 2 Naming 3 Cabling 3.1 Shared cable 3.2 Single - pair 4 Autonegotiation and duplex 5 Variants 6 See also 7 Notes 8 References 9 Further reading 10 External links History The Institute of Electrical and Electronics Engineers ( IEEE ) standards association ratified several versions of the technology. The first two early designs were StarLAN, standardized in 1986, at one megabit per second, and LattisNet, developed in January 1987, at 10 megabit per second. Both were developed before the 10BASE - T standard ( published in 1990 as IEEE 802.3 i ) and used different signalling, so they were not directly compatible with it. In 1988 AT&T released StarLAN 10, named for working at 10 Mbit / s. The StarLAN 10 signalling was used as the basis of 10BASE - T, with the addition of `` link beat '' to quickly indicate connection status. ( A number of network interface cards at the time could work with either StarLAN 10 or 10BASE - T, by switching link beat on or off. ) Using twisted pair cabling, in a star topology, for Ethernet addressed several weaknesses of the previous standards : Twisted pair cables could be used more generally and were already present in many office buildings, lowering overall cost. The centralized star topology was a more common approach to cabling than the bus in earlier standards and easier to manage. Using point - to - point links instead of a shared bus greatly simplified troubleshooting and was less prone to failure. Exchanging cheap repeater hubs for more advanced switching hubs provided a viable upgrade path. Mixing different speeds in a single network became possible with the arrival of Fast Ethernet. Depending on cable grades, subsequent upgrading to Gigabit Ethernet or faster may be as easy as replacing the network switches. Naming Main article : Ethernet physical layer § Physical layers The common names for the standards derive from aspects of the physical media. The leading number ( 10 in 10BASE - T ) refers to the transmission speed in Mbit / s. BASE denotes that baseband transmission is used. The T designates twisted pair cable, where the pair of wires for each signal is twisted together to reduce radio frequency interference and crosstalk between pairs. Where there are several standards for the same transmission speed, they are distinguished by a letter or digit following the T, such as TX, referring to the encoding method and number of lanes. Cabling 8P8C modular plug pin positioning TIA / EIA - 568 T568A termination Pin Pair Wire Color tip white / green ring green tip white / orange ring blue 5 tip white / blue 6 ring orange 7 tip white / brown 8 ring brown TIA / EIA - 568 T568B termination Pin Pair Wire Color tip white / orange ring orange tip white / green ring blue 5 tip white / blue 6 ring green 7 tip white / brown 8 ring brown Twisted - pair Ethernet standards are such that the majority of cables can be wired `` straight - through '' ( pin 1 to pin 1, pin 2 to pin 2 and so on ), but others may need to be wired in the `` crossover '' form ( receive to transmit and transmit to receive ). It is conventional to wire cables for 10 - or 100 - Mbit / s Ethernet to either the T568A or T568B standards. Since these standards differ only in that they swap the positions of the two pairs used for transmitting and receiving ( TX / RX ), a cable with T568A wiring at one end and T568B wiring at the other is referred to as a crossover cable. The terms used in the explanations of the 568 standards, tip and ring, refer to older communication technologies, and equate to the positive and negative parts of the connections. A 10BASE - T or 100BASE - TX node such as a PC uses a connector wiring called medium dependent interfaces ( MDI ), transmitting on pin 1 and 2 and receiving on pin 3 and 6 to a network device. An infrastructure node ( a hub or a switch ) accordingly uses a connector wiring called MDI - X, transmitting on pin 3 and 6 and receiving on pin 1 and 2. These ports are connected using a `` straight - through '' cable, so each transmitter talks to the receiver on the other side. Nodes can have two types of ports : MDI ( uplink port ) or MDI - X ( regular port, ' X ' for internal crossover ). Hubs and switches have regular ports. Routers, servers and end hosts ( e.g. personal computers ) have uplink ports. When two nodes having the same type of ports need to be connected, a crossover cable is often required at speeds of 10 or 100 Mbit / s, else connecting nodes having different type of ports ( i.e. MDI to MDI - X and vice versa ) requires straight - through cable. Thus connecting an end host to a hub or switch requires a straight - through cable. On switches / hubs sometimes a button is provided to allow a port to act as either a normal ( regular ) or an uplink port, i.e. using MDI - X or MDI pinout respectively. Many modern Ethernet host adapters can automatically detect another computer connected with a straight - through cable and then automatically introduce the required crossover, if needed ; if neither of the adapters has this capability, then a crossover cable is required. Most newer switches have automatic crossover ( `` auto MDI - X '' or `` auto - uplink '' ) on all ports, eliminating the uplink port and the MDI / MDI - X switch, and allowing all connections to be made with straight - through cables. If both devices being connected support 1000BASE - T according to the standards, they will connect regardless of whether a straight - through or crossover cable is used. A 10BASE - T transmitter sends two differential voltages, + 2.5 V or − 2.5 V. 100BASE - TX follows the same wiring patterns as 10BASE - T, but is more sensitive to wire quality and length, due to the higher bit rates. A 100BASE - TX transmitter sends three differential voltages, + 1 V, 0 V, or − 1 V. 1000BASE - T uses all four pairs bi-directionally using hybrid circuits and cancellers. The standard includes auto MDI - X ; however, implementation is optional. With the way that 1000BASE - T implements signaling, how the cable is wired is immaterial in actual usage. The standard on copper twisted pair is IEEE 802.3 ab for Cat 5e UTP, or 4D - PAM5 ; four dimensions using PAM ( pulse amplitude modulation ) with five voltages, − 2 V, − 1 V, 0 V, + 1 V, and + 2 V. While + 2 V to − 2 V voltage may appear at the pins of the line driver, the voltage on the cable is nominally + 1 V, + 0.5 V, 0 V, − 0.5 V and − 1 V. 100BASE - TX and 1000BASE - T were both designed to require a minimum of Category 5 cable and also specify a maximum cable length of 100 meters. Category 5 cable has since been deprecated and new installations use Category 5e. Unlike earlier Ethernet standards using broadband and coaxial cable, such as 10BASE5 ( thicknet ) and 10BASE2 ( thinnet ), 10BASE - T does not specify the exact type of wiring to be used, but instead specifies certain characteristics that a cable must meet. This was done in anticipation of using 10BASE - T in existing twisted - pair wiring systems that may not conform to any specified wiring standard. Some of the specified characteristics are attenuation, characteristic impedance, timing jitter, propagation delay, and several types of noise. Cable testers are widely available to check these parameters to determine if a cable can be used with 10BASE - T. These characteristics are expected to be met by 100 meters of 24 - gauge unshielded twisted - pair cable. However, with high quality cabling, cable runs of 150 meters or longer are often obtained and are considered viable by most technicians familiar with the 10BASE - T specification. Shared cable Main article : Category 5 cable § Shared cable 10BASE - T and 100BASE - TX only require two pairs ( pins 1 -- 2, 3 -- 6 ) to operate. Since Category 5 cable has four pairs, it is possible, but not necessarily standards compliant, to use the spare pairs ( pins 4 -- 5, 7 -- 8 ) in 10 - and 100 - Mbit / s configurations. The spare pairs may be used for Power over Ethernet ( PoE ), or two phone lines, or a second 10BASE - T or 100BASE - TX connection. In practice, great care must be taken to separate these pairs as most 10 / 100 - Mbit / s hubs, switches, and PCs electrically terminate the unused pins. Moreover, 1000BASE - T requires all four pairs to operate. Single - pair In addition to the more computer - oriented two and four - pair variants, the 100BASE - T1 and 1000BASE - T1 single - pair Ethernet PHYs are intended for automotive applications or as optional data channels in other applications. The single pair operates at full duplex and has a maximum reach of 15 m ( link segment type A ) or up to 40 m with up to four in - line connectors. Autonegotiation and duplex Ethernet over twisted pair standards up to Gigabit Ethernet define both full - duplex and half - duplex communication. However, half - duplex operation for gigabit speed is n't supported by any existing hardware. Higher speed standards, 2.5 GBASE - T up to 40GBASE - T running at 2.5 to 40 Gbit / s, consequently define only full - duplex point - to - point links which are generally connected by network switches, and do n't support the traditional shared - medium CSMA / CD operation. Many different modes of operations ( 10BASE - T half duplex, 10BASE - T full duplex, 100BASE - TX half duplex,... ) exist for Ethernet over twisted pair, and most network adapters are capable of different modes of operation. 1000BASE - T requires autonegotiation to be on in order to operate. When two linked interfaces are set to different duplex modes, the effect of this duplex mismatch is a network that functions much more slowly than its nominal speed. Duplex mismatch may be inadvertently caused when an administrator configures an interface to a fixed mode ( e.g. 100 Mbit / s full duplex ) and fails to configure the remote interface, leaving it set to autonegotiate. Then, when the autonegotiation process fails, half duplex is assumed by the autonegotiating side of the link. Variants Speed ( Mbit / s ) Reach ( m ) Name Standard Year Description 100 ( nominally ) StarLAN 802.3 e 1986 Runs over four wires ( two twisted pairs ) on telephone twisted pair or Category 3 cable. An active hub sits in the middle and has a port for each node. Manchester coded signaling. 10 100 ( nominally ) LattisNet ( pre ) 802.3 i Runs over AT&T Premises Distribution System ( PDS ) wiring or four wires ( two twisted pairs ) on telephone twisted pair or Category 3 cable. 10 100 ( nominally ) 10BASE - T 802.3 i Runs over four wires ( two twisted pairs ) on a Category 3 or Category 5 cable. Star topology with an active hub or switch sits in the middle and has a port for each node. This is also the configuration used for 100BASE - T and Gigabit Ethernet. Manchester coded signaling. 100 100 100BASE - TX 802.3 u 1995 4B5B MLT - 3 coded signaling, Category 5 cable copper cabling with two twisted pairs. 1,000 100 1000BASE ‐ T 802.3 ab 1999 PAM - 5 coded signaling. At least Category 5 cable with four twisted pairs copper cabling. Category 5 cable has since been deprecated and new installations use Category 5e. Each pair is used in both directions simultaneously. 2,500 5,000 100 2.5 GBASE - T 5GBASE - T 802.3 bz 2016 Downscaled 10GBASE - T for Category 5e ( 2.5 G ) and Category 6 ( 5G ) cabling 10,000 100 10GBASE ‐ T 802.3 an 2006 THP PAM - 16 coding. Uses category 6a cable. 25,000 40,000 30 25GBASE - T 40GBASE - T 802.3 bq 2016 Upscaled 10GBASE - T for proposed Cat 8.1 / 8.2 shielded cable Speed ( Mbit / s ) Reach ( m ) Name Standard Year Description Standard Transfer speed Channels per direction Bits per hertz per channel Spectral bandwidth Cable req. 100 m Cable spec 100 m 10BASE - T 10 Mbit / s 10 MHz Cat 3 16 MHz 100BASE - TX 100 Mbit / s 3.2 31.25 MHz Cat 5 100 MHz 1000BASE - T 1000 Mbit / s 62.5 MHz Cat 5e 100 MHz 2.5 GBASE - T 2500 Mbit / s 6.25 100 MHz Cat 5e 100 MHz 5GBASE - T 5000 Mbit / s 6.25 200 MHz Cat 6 250 MHz 10GBASE - T 10,000 Mbit / s 6.25 400 MHz Cat 6A 500 MHz 25GBASE - T 25,000 Mbit / s 6.25 1000 MHz Cat 8 ( 30 m ) 1600 / 2000 MHz 40GBASE - T 40,000 Mbit / s 6.25 1600 MHz Cat 8 ( 30 m ) 1600 / 2000 MHz Jump up ^ Generally, the higher - speed implementations support the lower - speed standards making it possible to mix different generations of equipment ; with the inclusive capability designated 10 / 100 or 10 / 100 / 1000 for connections that support such combinations. Jump up ^ The 8P8C modular connector is often called RJ45 after a telephone industry standard. Jump up ^ Transfer speed = channels × bits per hertz × spectral bandwidth Jump up ^ On 10BASE - T and 100BASE - TX one twisted pair of the cabling is used for transmission and another for reception, leaving two unused pairs. Higher speeds use all four pairs simultaneously for transmission ( TX ) and reception ( RX ). Jump up ^ Effective bits per hertz after loss to encoding overhead. Jump up ^ The spectral bandwidth is the maximum rate at which the signal will complete one hertz cycle. It is typical half the symbol rate, because one can send a symbol both at the positive and negative peak of the cycle. Exceptions are 10BASE - T where it is equal because it uses Manchester code, and 100BASE - TX where it is one quarter because it uses MLT - 3 encoding. Jump up ^ At shorter cable length, it is possible to use cables of a lower grade than that is required for 100 m. For example it is possible to use 10GBASE - T on a Cat 6 cable of 55 m or less. Likewise 5GBASE - T is expected to work with Cat 5e in most use cases. See also 25 - pair color code Copper cable certification Ethernet extender Network isolator Notes References Jump up ^ Charles E. Spurgeon ( 2000 ). Ethernet : the definitive guide. OReilly Media. ISBN 978 - 1 - 56592 - 660 - 8. Jump up ^ Urs von Burg ( 2001 ). The triumph of Ethernet : technological communities and the battle for the LAN standard. Stanford University Press. pp. 175 -- 176, 255 -- 256. ISBN 978 - 0 - 8047 - 4095 - 1. ^ Jump up to : Paula Musich ( August 3, 1987 ). `` User lauds SynOptic system : LattisNet a success on PDS ''. Network World. 4 ( 31 ). pp. 2, 39. Retrieved June 10, 2011. Jump up ^ W.C. Wise, Ph. D. ( March 1989 ). `` Yesterday, somebody asked me what I think about LattisNet. Here 's what I told him in a nutshell ''. CIO Magazine. 2 ( 6 ). p. 13. Retrieved June 11, 2011. ( Advertisement ) Jump up ^ Network Maintenance and Troubleshooting Guide. Fluke Networks. 2002. p. B - 4. ISBN 1 - 58713 - 800 - X. Jump up ^ StarLAN Technology Report, 4th Edition. Architecture Technology Corporation. 1991. ISBN 9781483285054. Jump up ^ Ohland, Louis. `` 3Com 3C523 ''. Walsh Computer Technology. Retrieved 1 April 2015. Jump up ^ IEEE 802.3 1.2. 3 Physical Layer and media notation Jump up ^ IEEE 802.3 40.1. 4 Signaling Jump up ^ David A. Weston ( 2001 ). Electromagnetic Compatibility : principles and applications. CRC Press. pp. 240 -- 242. ISBN 0 - 8247 - 8889 - 3. Retrieved June 11, 2011. Jump up ^ IEEE 802.3 40.1. 3 Operation of 1000BASE - T Jump up ^ Steve Prior. `` 1000BASE - T Duffer 's Guide to Basics and Startup '' ( PDF ). Retrieved 2011 - 02 - 18. Jump up ^ Nick van Bavel, Phil Callahan and John Chiang ( 2004 - 10 - 25 ). `` Voltage - mode line drivers save on power ''. Retrieved 2011 - 02 - 18. Jump up ^ IEEE 802.3 bw Clause 96 and 802.3 bp Clause 97 Jump up ^ Seifert, Rich ( 1998 ). `` 10 ''. Gigabit Ethernet : Technology and Applications for High - Speed LANs. Addison Wesley. ISBN 0 - 201 - 18553 - 9. Jump up ^ `` Configuring and Troubleshooting Ethernet 10 / 100 / 1000Mb Half / Full Duplex Auto - Negotiation ''. Cisco. 2009 - 10 - 28. Retrieved 2015 - 02 - 15. ^ Jump up to : `` IEEE P802. 3bq 40GBASE - T Task Force ''. IEEE 802.3. Jump up ^ Michael Palmer ( 2012 - 06 - 21 ). Hands - On Networking Fundamentals, 2nd ed. Cengage Learning. p. 180. ISBN 978 - 1 - 285 - 40275 - 8. Jump up ^ 802.3 a, b, c, and e-1988 IEEE Standards for Local Area Networks : Supplements to Carrier Sense Multiple Access With Collision Detection ( CSMA / CD ) Access Method and Physical Layer Specifications. IEEE Standards Association. 1987. doi : 10.1109 / IEEESTD. 1987.78883. Jump up ^ Eric Killorin ( November 2, 1987 ). `` LattisNet makes the grade in Novell benchmark tests ''. 4 ( 44 ). Network World. p. 19. Retrieved March 18, 2011. Jump up ^ IEEE Computer Society ( 2008 - 12 - 26 ), IEEE Std 802.3 - 2008 : 14.1. 1.3 Twisted - pair media, IEEE Further reading IEEE 802.3 standards documents External links How to Make a Network Cable, a how - to article from wikiHow How to create your own Ethernet Cables How to wire a 10Base - T or 100Base - T connector with category 5 cable and 8P8C modular connectors Step by step instructions on how to punch down category 5e cable to a RJ45 How to make a crossover patch cable using Cat5e or Cat6 and RJ45 Ethernet family of local area network technologies Speeds 10 Mbit / s 100 Mbit / s 1 Gbit / s 2.5 and 5 Gbit / s 10 Gbit / s 25 and 50 Gbit / s 40 and 100 Gbit / s 200 and 400 Gbit / s General Physical layer Autonegotiation EtherType Flow control Frames Jumbos Organisations IEEE 802.3 Ethernet Alliance Media Twisted pair Coaxial First mile 10G - EPON Historic CSMA / CD StarLAN 10BROAD36 10BASE - FB 10BASE - FL 10BASE5 10BASE2 100BaseVG LattisNet Long Reach Applications Audio Carrier Data center Energy Efficiency Industrial Metro Power over Ethernet Synchronous Transceivers MAU GBIC SFP XENPAK X2 XFP SFP+ QSFP CFP Interfaces AUI MDI MII GMII XGMII XAUI All Ethernet - related articles Retrieved from `` https://en.wikipedia.org/w/index.php?title=Ethernet_over_twisted_pair&oldid=807526478 '' Categories : Ethernet cables Physical layer protocols Local loop Hidden categories : All articles with unsourced statements Articles with unsourced statements from February 2011 Articles with unsourced statements from August 2011 Talk Variants Contents About Wikipedia Català Español Français Bahasa Indonesia Italiano עברית Kurdî Македонски Nederlands 日本 語 Polski Português Русский Српски / srpski Türkçe Tiếng Việt 中文 Edit links This page was last edited on 28 October 2017, at 14 : 59. 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Question: when used for ethernet unshielded twisted pair uses what type of connector
Answer: 8P8C connectors