Star Topology - HP J4091A Installation And Reference Manual

HP 100Base-T Hub 8 Installation and Reference Guide
LED
Light emitting diode on the front panel of the hub used for monitoring a hub or
network condition. An LED display corresponds to a hub condition.
Local Area Network (LAN)
A group of interconnected computers and support devices.
MDI Port (Medium Dependent Interface)
MDI is the IEEE standard for the twisted-pair interface. This RJ-45 port can be
used with straight-through cable to connect the hub to a network interconnection
device, such as another hub or 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, bridge or router). Pin-out assignments
are shown in Appendix B.
RJ-45 Connector
Most common terminator for twisted-pair wiring.
Shielded Twisted-Pair (STP)
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 100Ω and has the same pin assignment as UTP. This cable should not
be confused with the older 150Ω 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).
16 Glossary