OSI/TS Management Programming Manual

C-Series and D-Series Compatibility
Introduction
1–12 056786 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/TS version C21). In addition, it is possible that
the application, 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/TS running in a C30 system, and 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/TS 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.