CTCA

Specifies the number of seconds that VTAM® waits for completion after starting a channel program.

A STATION INOP can be scheduled at this time if a missing interrupt handler (MIH) purge has already taken place. The differences between the MIH and REPLYTO operands are:

The REPLYTO operand causes a message to be generated if a channel program is not completed after the time specified (or 3 seconds, if no time is specified).
The MIH=YES operand causes the link to become inoperative, defaulting to 3 minutes after the start I/O, if a timeout occurs because of the receiving host.