IBM 16/4 Token-Ring manual LAN. See local area network LAN

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.

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