BayStack 450 10/100/1000 Series Switches309978-D Rev 01 1-5The 10BASE-T/100BASE-TX port connectors are configured as MDI-X(media-dependent interface-crossover). These ports connect over straight cables tothe network interface controller (NIC) card in a node or server, similar to aconventional Ethernet repeater hub. If you are connecting to an Ethernet hub orEthernet switch, you need a crossover cable unless an MDI connection exists onthe associated port of the attached device (see “MDI and MDI-X Devices” onpage F-2).Your BayStack 450-24T and BayStack 450-12T switches use autosensing portsthat are designed to operate at 10 Mb/s or at 100 Mb/s, depending on theconnecting device. These ports support the IEEE 802.3u autonegotiation standard,which means that when a port is connected to another device that also supports theIEEE 802.3u standard, the two devices negotiate the best speed and duplex mode.The 10BASE-T/100BASE-TX RJ-45 switch ports also support half- andfull-duplex mode operation, and can connect to 10 Mb/s or 100 Mb/s Ethernetsegments or nodes (see “Connecting the 10BASE-T/100BASE-TX Ports” onpage 2-8).See Appendix F, “Connectors and Pin Assignments,” for more information aboutthe RJ-45 port connectors.100BASE-FX MT-RJ PortsYour BayStack 450-12F switch uses longwave 1300 nanometer (nm) MT-RJ portconnectors to attach devices over 62.5/125 or 50/125 micron multimode fiberoptic cable.BayStack 450-12F switches conform to the IEEE 802.3u 100BASE-FX standardand can be used for fiber-based 100 Mb/s connections (2 km/1.2 mi maximumdistance) to other compatible Fast Ethernet devices. Single-mode fiber cable is notsupported.Note: Use only Category 5 copper unshielded twisted pair (UTP) cableconnections when connecting 10BASE-T/100BASE-TX ports.
