IBM 16/4 Token-Ring User Manual page 107

H
half-duplex. In data communication, pertaining to
transmission in only one direction at a time. Contrast
with duplex.
hard error. An error condition on a network that
requires that the source of the error be removed or that
the network be reconfigured before the network can
resume reliable operation. See also beaconing. Contrast
with soft error.
I
IBM Personal Computer Disk Operating System
(DOS). A disk operating system based on MS-DOS.
IDE. Integrated drive electronics.
IEEE. Institute of Electrical and Electronics Engineers.
IEEE 802.2. Data Link protocol standard for use with
IEEE 802.3 (Ethernet), 802.4 (Token Bus), and 802.5
(Token Ring) standards.
initialize. In a LAN, to prepare the adapter (and
adapter support code, if used) for use by an application
program.
insert. To make an attaching device an active part of a
LAN.
interrupt. (1) A suspension of a process, such as
execution of a computer program, caused by an
external event and performed in such a way that the
process can be resumed. (2) To stop a process in such
a way that it can be resumed. (3) In data
communication, to take an action at a receiving station
that causes the sending station to end a transmission.
(4) A means of passing processing control from one
software or microcode module or routine to another, or
of requesting a particular software, microcode, or
hardware function.
interrupt level. The means of identifying the source of
an interrupt, the function requested by an interrupt, or
the code or feature that provides a function or service.
I/O. Input/output.
IP. Internet Protocol.
IPX. (1) Internet Packet Exchange. (2) Internetwork
Packet Exchange.
ISA. Industry Standard Architecture.
K
KB. (1) For processor storage and real and virtual
memory, 1024 bytes. (2) For disk storage capacity and
transmission rates, 1000 bytes.
L
LAN. See local area network (LAN).
LANAID. LAN Adapter Installation and Diagnostic
program. A LAN adapter installation and configuration
program used in environments that do not support Plug
and Play.
LAN Client. IBM LAN adapter environment that
minimizes the amount of DOS conventional memory
(below 1 MB) used by drivers and protocol stacks.
LAN segment. (1) Any portion of a LAN (for example,
a single bus or ring) that can operate independently but
is connected to other parts of the establishment network
via bridges. (2) An entire ring or bus network without
bridges. See cable segment, ring segment.
LAPS. LAN Adapter and Protocol Support.
LED. Light-emitting diode.
line data rate. The rate of data transmission over a
telecommunications link.
link. (1) The logical connection between nodes
including the end-to-end link control procedures. (2) The
combination of physical media, protocols, and
programming that connects devices on a network. (3) In
computer programming, the part of a program, in some
cases a single instruction or an address, that passes
control and parameters between separate portions of
the computer program. (4) To interconnect items of data
or portions of one or more computer programs. (5) In
SNA, the combination of the link connection and link
stations joining network nodes.
LLC. Logical link control.
local area network (LAN). A computer network
located on a user's premises within a limited
geographical area. Note: Communication within a local
area network is not subject to external regulations;
however, communication across the LAN boundary may
be subject to some form of regulation.
locally administered address. An adapter address
that the user can assign to override the universally
administered address. Contrast with universally
administered address.
LSB. Least significant bit.
LSL. Link support layer.
M
Mbps. Megabits per second.
MBps. Megabytes per second.
99
Glossary