Step for starting Telnet client traces

Before issuing the Telnet command, the following command should be issued from the TSO ready prompt or command line to allocate the trace data set:
ALLOC F(DEBUGFIL) DA(data.set.name) NEW

Trace data is written to the data set indicated in the command.

The trace is invoked by issuing the Telnet command with the DEBUG option:
  TELNET hostname (DEBUG