Website security

0-9

TermDefinition
10 BASE-T 10BASE-T, one of several physical media specified in the IEEE 802.3 standard for Ethernet local area networks (LANs), is ordinary telephone twisted pair wire. 10BASE-T supports Ethernet's 10 Mbps transmission speed. In addition to 10BASE-T, 10 megabit Ethernet can be implemented with these media types: • 10BASE-2 (Thinwire coaxial cable with a maximum segment length of 185 meters) • 10BASE-5 (Thickwire coaxial cable with a maximum segment length of 500 meters) • 10BASE-F (optical fiber cable); -FB is for fiber backbone; -FL is for fiber link between concentrator and station; -FP for passive star coupler • 10BASE-36 (broadband coaxial cable carrying multiple baseband channels for a maximum length of 3,600 meters) This designation is an Institute of Electrical and Electronics Engineers (IEEE) shorthand identifier. The "10" in the media type designation refers to the transmission speed of 10 Mbps. The "BASE" refers to baseband signaling, which means that only Ethernet signals are carried on the medium. The "T" represents twisted-pair; the "F" represents fiber optic cable; and the "2", "5", and "36" refer to the coaxial cable segment length (the 185 meter length has been rounded up to "2" for 200).
1000BASE-T A recent LAN standard for implementing 1000 Mbps Ethernet on Category 5 cable. Transmission technology based on the Ethernet frame format and protocol used in local area networks (LANs), provides a data rate of 1 billion bits per second (one gigabit). Gigabit Ethernet is defined in the IEEE 802.3 standard and is currently being used as the backbone in many enterprise networks. Gigabit Ethernet is carried primarily on optical fiber (with very short distances possible on copper media). Existing Ethernet LANs with 10 and 100 Mbps cards can feed into a Gigabit Ethernet backbone. An alternative technology that competes with Gigabit Ethernet is ATM. A newer standard, 10-Gigabit Ethernet, is also becoming available.
100BASE-T In 100 Mbps (megabits per second) Ethernet (known as Fast Ethernet), there are three types of physical wiring that can carry signals: • 100BASE-T4 (four pairs of telephone twisted pair wire) • 100BASE-TX (two pairs of data grade twisted-pair wire) • 100BASE-FX (a two-strand optical fiber cable) This designation is an Institute of Electrical and Electronics Engineers shorthand identifier. The "100" in the media type designation refers to the transmission speed of 100 Mbps. The "BASE" refers to baseband signaling, which means that only Ethernet signals are carried on the medium. The "T4," "TX," and "FX" refer to the physical medium that carries the signal. (Through repeaters, media segments of different physical types can be used in the same system.) The TX and FX types together are sometimes referred to as "100BASE-X." (The designation for "100BASE-T" is also sometimes seen as "100BaseT.")
110 connector A popular insulation displacement connector (IDC) used modular jacks, patch panels and cross connects.
2B1Q two (2) binary, one (1) quarternary. A one-dimensional modulation for transmitting 2 bits per symbol. 2B1Q is a 4-level PAM(pulse amplitude modulation) system used for HDSL, S-HDSL, and ISDN BRI.
3270 (IBM) A mainframe computer.Originally implemented on RG62 coax. Now generally implemented on UTP cable using baluns.
3G third generation
4/8 indent crimp A military-approved crimp used on screw-machined pin and socket contacts, such as in AMPLIMITE* connectors. The crimp consists of either one or two rows of indents equally spaced around the wire barrel of the contact.
4B/5B encoding A signal modulation scheme in which groups of four bits are encoded and transmitted in five bits in order to guarantee that no more than three consecutive zeroes ever occur; used in FDDI.
66 block A legacy cross connect system. Similar in function to AMP 110Connect XC.
802.3 network A 10-Mbps CSMA/CD bus-based network; commonly called Ethernet.
802.5 network A token-passing ring network operating at 4 or 16 Mbps.
8B/10B encoding A signal modulation scheme in which either four bits are encoded into a five-bit word or eight bits are encoded in a 10-bit word to ensure that too many consecutive zeroes do not occur; used in ESCON and Fiber Channel.
All | 0 1 2 3 4 5 6 7 8 9 | A B C D E F G H I J K L M N O P Q R S T U V W X Y Z