SNAX/XF LU Network Services Manual

Glossary
097841 Tandem Computers Incorporated Glossary–3
error code. A value indicating the reason for the error.
ESS table. See Enhanced System Services table.
event. A significant change in some condition in the system or network. Events can be
operational errors, notifications of limits exceeded, requests for action, notifications of
lines and other objects becoming available, and so on. Note that an event is not always
an error.
Event Management Service (EMS). A Tandem product comprised of a collection of
processes, tools, and interfaces that support the reporting and retrieval of event
information. It provides for different event descriptions for interactive and
programmatic interfaces, lets an operator or application select specific event-message
data, and allows flexible distribution of event messages within a system or network.
event message. An SPI message that describes an event occurring in the system or
network. Compare command message or response message.
Extended Binary Coded Decimal Interchange Code. An 8-bit coded character set. One of
two major codes used to represent and exchange data. See also ASCII.
Expand network. A network consisting of Tandem systems interconnected by
communication links and supported by Expand software.
fault-tolerant. An attribute of the Tandem NonStop system whereby a processor failure
does not result in loss of data or function.
hexadecimal. A numerical value in base 16; digits go from 0 to F. Tandem prefaces
hexadecimal notation with %H.
high-level SNA 3270 interface. A SNAX/XF application interface that provides for the
establishment of LU-LU sessions. High-level SNA 3270 interface supports the CRT
and ITI protocols, which simplify communications between an application process and
an SNA 3270-type device.
high PIN. A process identification number (PIN) that is greater than 255. See also low
PIN.
HLS. See SNAX/HLS.
host. A general-purpose processor, such as an IBM 3033, that contains an SSCP, PU
Type 5 logic, and one or more LUs representing different applications or application
subsystems.
INIT-SELF command. An SNA command issued by an initiating LU to request SSCP
assistance in establishing an LU-LU session with the named destination LU.
I/O process. A system process that manages I/O hardware. Applications use the file
system to send requests to I/O processes.
IMS. IBM Information Management System.
ITI protocol. See Interactive Terminal Interface protocol.
Interactive Terminal Interface protocol. A high-level 3270 protocol that simplifies
communications between an application process and a 3270-type device. The ITI