Transmission group trace operation

Start the transmission group trace with the MODIFY TRACE command. The name specified in the ID operand is any line associated with the transmission group trace. The trace is started for the transmission group in which the specified line resides. This line and its associated link station must be active before the transmission group trace is started. If a line trace is already active for the chosen line within a transmission group, you must stop it before starting a transmission group trace.

When activated, the transmission group trace remains active until one of the following conditions occurs:

The operator stops the trace.
The associated line or link station is deactivated or fails.
The NCP goes through automatic network shutdown.
The NCP goes into slowdown mode.

If the transmission group trace is ended because the associated line or link station fails or is deactivated, the operator can restart it by issuing the MODIFY command for another line in the TG.

For more information on the MODIFY TRACE command for the transmission group trace, see z/OS Communications Server: SNA Operation.

Note: If the data is not from a type 1, 2, or 3 scanner, VTAM® will not process the data. You must use ACF/TAP.

Make sure that the GTF with the TRACE=USR option is active before starting this trace. See Starting the generalized trace facility (GTF).

Use IPCS or ACF/TAP to format and print these trace records. For IPCS, specify USR(LINE) or USR(FF2) on the GTFTRACE option. For ACF/TAP, specify INPUT=LINE.

For more information on printing trace output, see Formatting and printing trace records.