3Com 3C17205-US - Corp SUPERSTACK 3 SWITCH 4400 24PORT Implementation Manual page 147

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Power over Ethernet Power supplied using either the spare pairs or signal pairs of an
Ethernet cable using the IEEE 802.3af standard.
protocol A set of rules for communication between devices on a network. The
rules dictate format, timing, sequencing and error control.
RADIUS Remote Authentication Dial-In User Service. An industry standard
protocol for carrying authentication, authorization and configuration
information between a network device and a shared authentication
server.
Rapid Spanning Tree An enhanced version of the Spanning Tree Protocol that allows faster
Protocol determination of Spanning Tree topology throughout the bridged
network.
repeater A simple device that regenerates LAN traffic so that the transmission
distance of that signal can be extended. Repeaters are used to connect
two LANs of the same network type.
resilient link A pair of ports that can be configured so that one takes over data
transmission should the other fail. See also main port and standby port.
RMON IETF Remote Monitoring MIB. A MIB that allows you to remotely
monitor LANs by addressing up to nine different groups of information.
router A router is a device on your network which is used to forward IP
packets to a remote destination. An alternative name for a router is a
gateway.
roving analysis port A system that allows you to copy the traffic from one port on a Switch
(RAP) to another port on the Switch. Roving Analysis is used when you want
to monitor the physical characteristics of a LAN segment without
changing the characteristics by attaching a monitoring device.
RPS Redundant Power System. A device that provides a backup source of
power when connected to a Switch.
RSTP See Rapid Spanning Tree Protocol.
SAP Service Access Point. A well-defined location that identifies the user of
services of a protocol entity.
segment A section of a LAN that is connected to the rest of the network using a
switch or bridge.