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non-fault tolerant mode
When a device cannot reserve the power of a single
power supply to act as backup if one of the other
power supplies fails.
OSPF
Open Shortest Path First. Interior Gateway Protocol
for TCP/IP networks; uses the Dijkstra algorithm, a
link-state routing algorithm that calculates routes for
packets based on a number of factors, including least
hops, speed of transmission lines, and congestion
delays.
out-of-band
Transmission of auxiliary information, for example,
management messages, over a medium other than
that used by the system users.
packet
Any logical block of data that is sent over a network.
It contains a header that consists of control
information such as senders, receivers, and error
control data, as well as the message itself.
protocol
A set of rules for communicating between computers.
The rules dictate format, timing, sequencing, and
error control.
PDU
Protocol Data Unit. A unit of data that is specified in a
layer protocol and consists of protocol control
information and layer user data.
QoS
Quality of Service. Term to describe delay, throughput,
bandwidth, and so forth of a virtual connection; a
measure of the service quality provided to a user.
RJ-45 connector
A telephone connector that holds up to eight wires.
RJ-45 plugs and sockets are used in 10Base-T
Ethernet devices.
router
A device that connects two remote networks by
selectively forwarding messages between them. A
router differs from a bridge and a gateway in that it
selectively forwards information between the
networks. Routers can be implemented in pairs, or a
router may communicate directly with a computer.
RS-232 serial port
A port that changes the parallel arrangement of data
within computers to the serial (one after the other)
form used on data transmission links. This port can be
used for dedicated local management access.
SC connector
A fiber-optic cable connector that uses a push-pull
latching mechanism similar to common audio and
video cables. For bi-directional transmission, two fiber
cables and two SC connectors are generally used.
SCC
System Controller Component. Supports Switch
monitoring, module inventory management, and
power management.
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LOSSARY
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