option. (1) A specification in a statement, a selection
from a menu, or a setting of a switch, that may be used
to influence the execution of a program. (2) A
hardware or software function that may be selected or
enabled as part of a configuration process. (3) A piece
of hardware (such as a network adapter) that can be
installed in a device to modify or enhance device
function.
P
packet. (1) In data communication, a sequence of
binary digits, including data and control signals, that is
transmitted and switched as a composite whole.
(2) Synonymous with
data frame. Contrast with frame.
parameter. (1) A variable that is given a constant
value for a specified application and that may denote
the application. (2) An item in a menu or for which the
user specifies a value or for which the system provides
a value when the menu is interpreted. (3) Data passed
between programs or procedures.
path. (1) In a network, any route between any two
nodes. (2) The route traversed by the information
exchanged between two attaching devices in a network.
(3) A command in IBM Personal Computer Disk
Operating System (PC DOS) and IBM Operating
System/2 (OS/2) that specifies directories to be
searched for commands or batch files that are not found
by a search of the current directory.
PC. Personal computer.
PCI. Peripheral Component Interconnect.
Peripheral Component Interconnect (PCI). The PCI
Local Bus is a high performance 32-bit or 64-bit bus. It
is intended for use as an interconnect mechanism
between highly integrated peripheral controller
components, peripheral add-in boards, and
processor/memory systems.
power-on self-test (POST). A series of diagnostic
tests that are run automatically each time the
computer’s power is turned on.
protocol. (1) A set of semantic and syntactic rules
that determines the behavior of functional units in
achieving communication. (2) In SNA, the meanings of
and the sequencing rules for requests and responses
used for managing the network, transferring data, and
synchronizing the states of network components. (3) A
specification for the format and relative timing of
information exchanged between communicating parties.
R
RAM. Random access memory. (A)
RARP. Reverse Address Resolution Protocol.
register. (1) A storage area in a computer’s memory
where specific data is stored. (2) A storage device
having a specified storage capacity such as bit, byte, or
computer word, and usually intended for a special
purpose.
remove. (1) To take an attaching device off a network.
(2) To stop an adapter from participating in data
passing on a network.
ring segment. A ring segment is any section of a ring
that can be isolated (by unplugging connectors) from
the rest of the ring. A segment can consist of a single
lobe, the cable between access units, or a combination
of cables, lobes, and/or access units. See
cable
segment, LAN segment.
ROM. Read only memory. (A)
S
SCSI. Small computer system interface.
segment. See
cable segment, LAN segment, ring
segment.
shielded twisted pair. A transmission medium of two
twisted conductors with a foil or braid shell.
SMP. System Modification Program
soft error. An intermittent error on a network that
causes data to have to be transmitted more than once
to be received. A soft error affects the network’s
performance but does not, by itself, affect the network’s
overall reliability. If the number of soft errors becomes
excessive, reliability is affected. Contrast with
hard
error.
station. (1) A communication device attached to a
network. The term used most often in LANs is an
attaching device or workstation. (2) An input or output
point of a system that uses telecommunication facilities;
for example, one or more systems, computers,
terminals, devices, and associated programs at a
particular location that can send or receive data over a
telecommunication line. See also
attaching device,
workstation.
STP. See
shielded twisted pair.
Glossary of Terms and Abbreviations
X-5
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