3Com SuperStack II 3000 TX, User Manual

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LOSSARY
3
LAN
Local Area Network. A network of connected com-
puting resources (such as PCs, printers, servers) cov-
ering a relatively small geographic area (usually not
larger than a floor or building). Characterized by
high data rates and low error rates.
latency
The delay between the time a device receives a
frame and the time the frame is forwarded out of
the destination port.
line speed
See baud rate .
main port
The port in a resilient link that carries data traffic in
normal operating conditions.
MDI / MDIX
Medium Dependent Interface. A type of Ethernet
twisted pair port connection: MDI ports connect to
MDIX (cross-over) ports using straight-through
twisted pair cabling; MDI-to-MDI and MDIX-to-MDIX
links use cross-over twisted pair cabling.
MIB
Management Information Base. Stores a device’s
management characteristics and parameters. MIBs
are used by the Simple Network Management Proto-
col (SNMP) to contain attributes of their managed
systems. The Switch contains its own internal MIB.
multicast
Single packets copied to a specific subset of net-
work addresses. These addresses are specified in
the destination-address field of the packet.
PACE
Priority Access Control Enabled. 3Com’s innovative
technology which works in conjunction with a
switch to control the latency and jitter associated
with the transmission of multimedia traffic over
Ethernet and Fast Ethernet.
POST
Power On Self Test. An internal test that the Switch
carries out when it is powered-up.
protocol
A set of rules for communication between devices
on a network. The rules dictate format, timing,
sequencing and error control.
resilient link
A pair of ports that can be configured so that one
will take over data transmission should the other
fail. See also
main port and standby port .
RJ45
Standard 8-wire connectors for IEEE 802.3 10BASE-T
networks.