Example 2 — Creating a transport class for large messages

This example illustrates a sysplex of two systems in which the transport class (BIG) is defined to handle messages of up to 40,000 bytes and all other defaults in the COUPLExx parmlib member are taken.

In this scenario, the sysplex PLEXOF2B consists of two MVS™ systems (SYSA and SYSB) on two processors. In the sysplex, the length of messages sent by members of various groups vary widely and, thus, messages require special consideration:

All groups on SYSA have members that send small messages (up to 1,000 bytes) to their group members on SYSB.
Some groups on SYSA have members that send longer messages (up to 40,000 bytes) to their group members on SYSB.

When there is a large amount of signaling traffic and message lengths vary widely, segregating messages by size, as shown in this example, can often improve signaling performance.