User`s guide

CheetaHub Power-3012A User’s Guide
Glossary 3
MDI Port (Medium Dependent Interface)
MDI is the IEEE standard for the twisted-pair interface to 10BASE-T (or
100BASE-TX). This RJ-45 port can be used with straight-through cable to connect the
hub to a network interconnection device, such as a switch. Pin-out assignments are
shown in Appendix B.
MDI-X Port (Medium Dependent Interface - Crossed)
This RJ-45 port, which crosses the receive and transmit signals internally, can be used
with straight-through cable to connect the hub to any device that has a standard network
interface (e.g., workstation, server or router). Pin-out assignments are shown in
Appendix B.
RJ-45 Connector
Most common terminator for twisted-pair wiring.
Shielded Twisted-Pair (STP)
100W Category 5 twisted-pair wire covered with an external aluminum-foil or woven-
copper shield designed to reduce excessive noise pick up or radiation. The STP cable
referred to in this manual is also sometimes called screened twisted-pair (ScTP). Its
impedance is 100
Wand has the same pin assignment as UTP. This cable should not be
confused with the older 150
Wcable type designed by IBM.
Star Topology
Physical connections for this hub are limited to a star configuration (i.e., similar to a hub
and spoke arrangement). This topology also requires that only one path exists between
any two nodes, and that data transmitted by any node is concurrently available to all
other nodes within the same local network (i.e., immediate collision domain).