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Redes 316 A local-area network (LAN) architecture developed by Xerox Corporation in cooperation with DEC and Intel in 1976. Ethernet uses a bus or star topology and supports data transfer rates of 10 Mbps. The Ethernet specification served as the basis for the IEEE 802.3 standard, which specifies the physical and lower software layers. Ethernet uses the CSMA/CD access method to handle simultaneous demands. It is one of the most widely implemented LAN standards. A newer version of Ethernet, called 100Base-T (or Fast Ethernet), supports data transfer rates of 100 Mbps. And the newest version, Gigabit Ethernet supports data rates of 1 gigabit (1,000 megabits) per second. List of Ethernet standards Designation Description 10Base-2 10 Mbps baseband Ethernet over coaxial cable with a maximum distance of 185 meters. Also referred to as Thin Ethernet or Thinnet or Thinwire 10Base-5 10 Mbps baseband Ethernet over coaxial cable with a maximum distance of 500 meters. Also referred to as Thick Ethernet or Thicknet or Thickwire. 10Base-36 10 Mbps baseband Ethernet over multi-channel coaxial cable with a maximum distance of 3,600 meters. 10Base-F 10 Mbps baseband Ethernet over optical fiber. 10Base-FB 10 Mbps baseband Ethernet over two multi-mode optical fibers using a synchronous active hub. 10Base-FL 10 Mbps baseband Ethernet over two optical fibers and can include an optional asynchronous hub. 10Base-T 10 Mbps baseband Ethernet over twisted pair cables with a maximum length of 100 meters. 10Broad-36 10 Mbps baseband Ethernet over three channels of a cable television system with a maximum cable length of 3,600 meters. 10Gigabit Ethernet Ethernet at 10 billion bits per second over optical fiber. Multimode fiber supports distances up to 300 meters; single mode fiber supports distances up to 40 kilometers. 100Base-T 100 Mbps baseband Ethernet over twisted pair cable. 100Base-T2 100 Mbps baseband Ethernet over two pairs of Category 3 or higher unshielded twisted pair cable. 100Base-T4 100 Mbps baseband Ethernet over four pairs of Category 3 or higher unshielded twisted pair cable. Coaxial cable Fiber optic cable UTP cable BNC connectors (Bayonet Neill– Concelman) BNC connectors. From left to right: 75 Ω female, 75 Ω male, 50 Ω female, 50 Ω male. BNC Tee Connectors with resistive load terminators ST (straight tip) Subscriber (square) connector (SC) Small form factor (SFF) connectors • Mechanical transfer registered jack (MT-RJ) • Local connector (LC) ST (an AT&T Trademark) is probably still the most popular connector for multimode networks SC is a snap-in connector also with a 2.5 mm ferrule that is widely used for it's excellent performance. It was the connector standardized in TIA-568-A, but was not widely used at first because it was twice as expensive as a ST. MT-RJ is a duplex connector with both fibers in a single polymer ferrule. It uses pins for alignment and has male and female versions. Multimode only, field terminated only by prepolished/splice method. LC is a small form factor connector that uses a 1.25 mm ferrule, half the size of the SC. Otherwise, it's a standard ceramic ferrule connector, easily terminated with any adhesive. Good performance, highly favored for singlemode. 8P8C (RJ*-45) *RJ (registered jack) The 8 position 8 contact (8P8C) connector is a modular connector commonly used to terminate twisted pair and multiconductor flat cable. The original RJ45S uses keyed 8P2C modular connector, with Pins 5 and 4 (the middle 2 positions) wired for tip and ring of a single telephone line and Pins 7 and 8 shorting a programming resistor. It was meant to be used with a high speed modem, and is obsolete today.