Introduction to Networking for NonStop S-Series Servers

HP NonStop S-Series Systems Network Architecture
(SNA) Network Connections
Introduction to Networking for HP NonStop S-Series Servers—520670-005
7-15
SNAX/APC and SNAX/HLS
SNAX/APC and SNAX/HLS
SNAX/APC and SNAX/HLS are products that implement high-level SNA protocols and
provide high-level application interfaces. SNAX/APC uses SNA LU 6.2 protocols and
allows you to develop applications that communicate with other LU 6.2 applications in
an SNA network. SNAX/HLS allows you to develop applications that communicate with
LU types 0, 1, 2, 3, 4, and 7. Both products use the services of either SNAX/XF or
SNAX/APN, depending on the connection requirements.
SNAX/APC and SNAX/HLS both have features that simplify application development
and management:
•
They are integrated with the Pathway environment, which provides a COBOL-like
application language, screen design aids, and resource-management features
such as online load balancing. Alternatively, you can write your application in any
other language supported by HP.
•
They allow application prototyping, which enables you to simulate application
functions during code development.
•
They include features that provide for specification and formatting of trace
information along with commands for control and error analysis.
Additionally, the SNAX/HLS product is designed to let you split the task of development
so that most programmers need little specific knowledge of SNA. To establish a
session, for instance, a programmer merely specifies the name of a session partner
and the name of an HLS Resource Definition Table profile (maintained by a system
administrator to describe the characteristics of the HLS-to-application interface and the
BIND and INIT-SELF parameters used in SNA sessions), and SNAX/HLS retrieves the
appropriate SNA parameters.
SNAX Application Logical Unit (SNALU)
The SNALU interface provides SNAX/HLS and SNAX/APC with lower-level SNA data-
link control and path control functions. The SNALU interface is also directly available to
your applications, giving you direct control of SNA message flows.
Note. The same SNAX/HLS, SNAX/APC, or Exchange/SNA application can run without
change over SNAX/XF or SNAX/APN. A SNALU application sensitive to the contents of the
SNA session initiation command might require modification, however.