Exchange/SNA Manual

Appendix F Supplemental Information for
D-Series Systems
104700 Tandem Computers Incorporated F–1
D-series Exchange/SNA runs on Tandem’s D-series operating system and supports
the features in the D-series operating system.
This appendix provides specific information about the D-series Exchange/SNA
product relevant to the Exchange/SNA Manual.
For additional information on the D-series operating system refer to the following
Tandem documents:
Introduction to D-Series Systems
D-Series System Migration Planning Guide
Guardian Procedure Calls Reference Manual
Guardian Application Conversion Guide
Overview of D-Series
Exchange/SNA
D-series Exchange/SNA has no new functionality other than the ability to
accommodate high PINs available with D-series system software.
Exchange/SNA screen displays that include PINs accommodate the larger PINs
allowed by the D-series operating system.
Compatibility and
Networking
Restrictions
D-series Exchange/SNA follows the rules and conventions that govern network
communication and compatibility between D-series software, C-series software, and
B-series software.
D-series Exchange/SNA runs only on the D-series operating system. However,
D-series processes assigned to a low PIN on a D-series system can communicate with
C-series systems.
C-series Exchange/SNA can run on either C-series or D-series operating systems, but
cannot support high PINs on the D-series system.
An error message appears when a process running at a high PIN attempts to
communicate with a C-series system and when a process running on a C-series system
attempts to communicate with a process running at a high PIN. (See “Error Message,”
below.)
Starting High PINs D-series Exchange/SNA supports high PINs in D-series operating systems.
In D-series Exchange/SNA, the default setting of the BINDER HIGHPIN flag in the
object file is enabled. As a result, new processes are automatically assigned to run at a
high PIN (if a high PIN is available). In a network composed only of D-series systems,
running at a high PIN may be desirable.
However, because high-PIN processes cannot communicate with C-series systems, in a
mixed network of C-series and D-series systems, you may wish to start processes at
low PINs.
To start a D-series Exchange/SNA process at a low PIN, disable the BINDER
HIGHPIN flag in the Exchange/SNA object file by setting it to HIGHPIN OFF.