SNAX/HLS Diagnosis and Support Manual

Glossary
Glossary–4 104706 Tandem Computers Incorporated
HLSTAP. Trace Analysis Program for SNAX/HLS. HLSTAP formats SNAX/HLS
requests and responses in terms that do not require a detailed understanding of
SNAX/HLS.
HLSRDT. Constructs the resource definition table (RDT) for SNAX/HLS. The RDT is
the configuration database for SNAX/HLS. Each RDT PROFILE contains the required
SNA-specific information necessary to configure and initiate a session. This
information includes such SNA parameters as the BIND and INIT–SELF.
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.
ITI protocol. See interactive terminal interface protocol.
interactive terminal interface (ITI) protocol. One of the SNAX/XF and SNAX/CDF high-
level 3270 protocols that simplifies communications between an application process
and a 3270-type device. The ITI protocol supports line-at-a-time communications with
certain SNA 3270-type display stations. ITI translates the message and encloses it in
the 3270 envelope. See also CRT protocol and PRT protocol.
I/O process. A system process to manage I/O hardware. Applications use the file
system to send requests to I/O processes.
Kanji. A graphic character set consisting of symbols used in Japanese ideographic
alphabets. Each character is represented by 2 bytes.
Kanji character set. Synonym for extended graphic character set (EGCS).
Katakana. A character set of symbols used in one of the two common Japanese phonetic
alphabets, that is used primarily to write foreign words phonetically.
leased line. A connection between systems or devices that does not have to be made by
dialing. Synonymous with “nonswitched line.”
LIM. See line interface module.
line interface module. A circuit board that provides the electrical and mechanical
interface between a communication line interface processor and the communication
line.
logical unit (LU). A logical unit represents a port by which the end user gains access to
the network. A 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.
LU. See logical unit.
LU–LU session. The creation of a temporary data path consisting of a physical and a
logical connection between two LUs in separate domains for information exchange.
To establish a data path between two LUs in separate domains for data exchange, four
types of sessions must exist: SSCP-SSCP, SSCP-PU, SSCP-LU, and LU-LU.