100BASE-T The IEEE has developed a set of standards for the operation of a 100 Mbps Ethernet Network. The three additions to the 802.3 document are 100BASE-TX, 100BASE-FX AND 100BASE-TX are designed to operate over two pairs of category 5 UTP cabling. 100BASE-FX is designed to operate over two optical fibers, and 100BASE-T4 is designed to operate over four pairs of category 3 or 5e, UTP or STP cabling The network consists of a central hub that is connected in a star-wired configuration to individual workstations containing a network interface card. The IEEE 802.3 100BASE-T standard recommends the use of category 5e UTP cabling for network implementation. Category 5e structured cabling that is compliant with the TIA/EIA 568-A standard will fully support a 100BASE-T network.
MODULAR 10BASE-T 10BASE-T is an IEEE 802.3 standard for operating 10 Mbps Ethernet local area network (LANs) on unshielded twisted-pair cabling. Some advantages 10BASE-T has over the original coax-based Ethernet LANs include the possible use of existing building cabling, lower cost, and elimination of network failure due to main bus failures. 10BASE-T networks require a minimum of category 3 cable and connecting hardware for proper operation. The overall system consists of a central cabling hub that is connected in a star-wired configuration to individual workstations containing a Network Interface Card (NIC) with either an internal or external transceiver. The cabling hub typically supports port sizes in increments of 12. (There are a limited number of manufacturers that work in increments of 8.) The IEEE 802.3 10BASE-T Standard specifies the mechanical link to the twisted-pair network as an 8-position modular jack that utilizes pins 1 and 2 for TD+ and TD- signals respectively and pins 3 and 6 for RD+ and RD- signals respectively. A system wired to TIA/EIA 568-A will fully support 10BASE-T applications.
1000BASE-T (COPPER) The IEEE 802.3ab taskforce is developing a gigabit Ethernet solution that supports 1 gigabit per second (Gbps) transmission rates over 4-pairs of category 5e UTP cable. The 1000BASEES-T implementations will utilize new technology and new signal encoding schemes in order to satisfy their high bit rate objectives. 1000BASE-T solutions will be backward compatible with 10BASE-T and 100BASE-T technologies. Gigabit Ethernet over copper will be supported by the TIA and ISQ worst case 100m channel topology and is expected to be supported by installed category 5 legacy cabling.
1000BASE-SX/LX (FIBER) The IEEE 802.3z taskforce has developed a gigabit Ethernet solution over fiber that supports half-and full duplex transmission at speeds of 1Gbps (1000mbps). The 1000Base-SX standard was developed to support lower cost multimode fiber runs in horizontal and shorter-length backbone applications. The 1000BASE-SX standard supports the multimode fiber distances. The 1000Base-LX standard was developed to support longer-length multimode building fiber backbones and singlemode campus backbones. The 1000Base-LX standard supports multimode lengths of 3km. 1000Base-T solutions will be backward compatible with 10Base-T and 100Base-T technologies.
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