SNAX/APC Configuration and Management Manual

Glossary
SNAX/APC Configuration and Management Manual—138787
Glossary-6
independent verbs
independent verbs. Verbs that can be used in either basic or mapped conversations.
SNAX/APC supports only GET-TYPE.
interprocessor communications (IPC). The exchange of messages between processors.
I/O process. A system process to manage I/O hardware. Applications use the operating
system to send requests to I/O processes.
IPC. See interprocessor communications (IPC).
IPC version code. A code used by SNAX/APC to identify the version of the verbs available
to a transaction program; for example, S1, S2, and S3. The code is carried in the IPC
message header.
interprocessor communications (IPC). The exchange of messages between processors.
LEN. Low-entry networking.
LEN end node. See low-entry networking (LEN) end node
.
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 WAN subsystem.
local TP. The transaction program running in the node under discussion (usually the Tandem
system).
logical unit (LU). In SNA, a port by which an end user accesses the network. An LU
establishes the connections for the transmission of data between end users in the
network. LUs are associated with either application programs or a user terminal. SNA
categorizes LUs according to the type of end-user services that the LU provides.
logical unit 6.2. A type of logical unit that supports general communication between
programs in a distributed processing environment. LU 6.2 is characterized by (1) a peer
relationship between session partners, (2) efficient utilization of a session for multiple
transactions, (3) comprehensive end-to-end error processing, and (4) a generic
application program interface consisting of structured verbs that are mapped into a
product implementation.
low-entry networking (LEN) end node. A type 2.1 end node that provides all SNA end-user
services, can attach directly to another type 2.1 nodes using peer protocols, and derives
network services implicitly from an adjacent network node when attached to an APPN
network without a session between its local control point (CP) and another CP; it can
also attach to a subarea network as a peripheral node.
LU. See logical unit (LU)
.