Fast EtherHub-12s User’s Guide
Glossary
3
Shielded Twisted-Pair (STP)
100
W
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
refered to in this manual is also sometimes called screened twisted-pair (ScTP). Its
impedance is 100
W
and has the same pin assignment as UTP. This cable should not be
confused with the older 150
W
cable 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).
Station Port
The MDI-X port can be used for connecting the hub to any device that has a standard
network interface (e.g., workstation, server or router). For port 12, the selector switch
must be set to
MDI-X
. (This port can also be connected to an MDI port on another
compatible hub or a switch.)
Unshielded Twisted-Pair (UTP)
Cable composed of insulated wires twisted together to reduce electrical interference;
used in common telephone cord.
