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LOSSARY
81
modem
Modulator/demodulator. The device that converts
serial digital data from a transmitting terminal to a
signal suitable for transmission over a telephone
(analog) channel. At the other end, another modem
converts the analog signal to digital data for use by
the computers. A modem port provides the interface
for remote management of the Switch 4007. An
external modem can be connected to the serial port
of the system processor.
multicast
A special form of broadcast where copies of the
packet are delivered only to a subset of all possible
destinations.
multiplexing
A function within a layer that interleaves the
information from multiple connections into one
connection.
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.