IBM SC34-7012-01 manual Intersystem communication failures

The TEP is entered once for each terminal error, and therefore should be designed to process only one error for each invocation.

Intersystem communication failures

An intersystem communication failure can be caused by the failure of a CICS region, or the remote system to which it is connected. A network failure can also cause the loss of the connection between CICS and a remote system.

If the failure occurs between syncpoints, CICS and the remote system can back out any updates of recoverable resources either dynamically or following an emergency restart.

If a failure occurs during the syncpointing process while a distributed unit of work is indoubt, CICS handles the unit of work according to the indoubt attributes defined on the transaction resource definition. One possible course of action is to shunt the UOW as failed-indoubt to await resynchronization when communications are restored. When designing applications, remember that if a communications failure occurs and units of work are shunted as failed-indoubt, resources remain locked until after resynchronization.

For information about the resolution of indoubt units of work, see the CICS

Installation Guide.

98CICS TS for z/OS 4.1: Recovery and Restart Guide