OSI/AS Management Programming Manual

C-Series and D-Series Compatibility
Introduction
1–18 056785 Tandem Computers Incorporated
Mixed C-Series and
D-Series Expand Networks
Some Expand networks may have some D-series systems, some C30-version systems,
and some C20-version systems (OSI/AS version C21). In addition, it is possible that
the application, OSI/AS, OSI/TS, and either X25AM or TLAM are each running in a
different node at a different version level (the application may, perhaps, be running in
a D00 system, OSI/AS running in a C30 system, and OSI/TS or X25AM running in a
C21 system). It is also possible in networks having nodes of mixed version levels that
the SCF module used to configure and manage OSI/AS resides on a different node
and is at a different version level.
General restrictions on inter-node communications between a D-series system and a
C-series system are as follows:
High-PIN processes cannot access processes in a C-series system.
Low-PIN processes in a D-series system can access processes in a C-series system.
Processes in a C-series system can access only the low-PIN processes in a D-series
system.