SNAX/XF and SNAX/APN Configuration and Management Manual

Glossary
SNAX/XF and SNAX/APN Configuration and Management Manual—425836-005
Glossary-11
LIF
LIF. See logical interface (LIF).
line. The specific hardware path over which data is transmitted or received. A line can also
have a process name associated with it that identifies an input/output process (IOP) or
logical device associated with that specific hardware path.
line-at-a-time mode. A terminal operating mode in which data is read from the terminal and
displayed on the terminal screen one line at a time. Contrast with block mode.
line-handler process. The process within the SNAX/XF subsystem that implements line-
specific protocols. SCF and SPI commands directed to SNAX/XF are received by the
service manager, which passes them on to a line handler when necessary. A service
manager can manage multiple line handlers.
LINE object type. An SCF object that defines a line resource used by SNAX.
link. þA transmission medium and data link control component that together transmit data
between adjacent nodes.
link station. The hardware and software components within a node representing a
connection to an adjacent node over a specific link. For example, if node A is the
primary end of a multipoint line that connects to three adjacent nodes, node A will have
three link stations representing the connections to the adjacent nodes.
LLC. See logical link control (LLC).
local area network (LAN). A network that is located in a small geographical area and
whose communications technology provides a high bandwidth, low cost medium to
which low cost nodes can be connected. One or more LANs can be connected to the
system such that the LAN users can access the system as if their workstations were
connected directly to it. Contrast with system area network (SAN) and wide area
network (WAN).
local LU object. An SCF object that represents an LU residing on a NonStop node.
local passthrough. Any passthrough session that involves only one NonStop node.
local PU object. An SCF object that represents a PU residing on a NonStop node.
logical interface (LIF). The interface that allows an application or another process to
communicate with data communications hardware.
logical link control (LLC). The IEEE 802-defined layer provides two types of DLC
operation. The first is a connectionless service, which allows data to be sent and
received without establishing a link. LLC also has a connection-oriented service with
sequenced information transfer, flow control, and error recovery.
logical unit (LU). An entity representing a logical port that provides access to the services
of an SNA network, typically for communications between end users such as terminals,