3Com 2426-PWR Installation And User Manual

Also see for 2226-SFP Plus: User guide

Contents

G LOSSARY10BASE-TThe IEEE specification for 10 Mbps Ethernet overCategory 3, 4 or 5 twisted pair cable.100BASE-TXThe IEEE specification for 100 Mbps Fast Ethernet overCategory 5 twisted-pair cable.1000BASE-LXIEEE 802.3z specification for Gigabit Ethernet over 9/125micron core single-mode fiber cable.1000BASE-SXIEEE 802.3z specification for Gigabit Ethernet over twostrands of 50/125 or 62.5/125 micron core multimodefiber cable.1000BASE-TIEEE 802.3ab specification for Gigabit Ethernet over100-ohm Category 5, 5e or 6 twisted-pair cable (using allfour wire pairs).Auto-negotiationAuto-negotiation is where two devices sharing a link,automatically configure to use the best common speed.The order of preference (best first) is: 1000BASE-T fullduplex, 100BASE-TX full duplex, 100BASE-TX halfduplex, 10BASE-T full duplex, and 10BASE-T half duplex.Auto-negotiation is defined in the IEEE 802.3 standardfor Ethernet and is an operation that takes place in afew milliseconds. Auto-negotiation must be enabled forthe 1000BASE-T ports to operate at 1000 Mbps, fullduplex.BandwidthThe information capacity, measured in bits per second,that a channel can transmit. The bandwidth of Ethernetis 10 Mbps, the bandwidth of Fast Ethernet is 100Mbps and Gigabit Ethernet is 1000 Mbps.BPDUBridge Protocol Data Unit. A type of information packetthat ensures that data is efficiently exchanged betweenSwitches in a LAN. BPDU messages detect loops in anetwork, and remove them by shutting down the bridgecausing the loop.