Use the DATACTTIME statement to specify the number of seconds that the FTP client waits after attempting to send or receive data before terminating the connection and reporting an error to the user. The default is 120. The valid range for DATACTTIME is 0 (DATACTTIME not used) or 15-86 400.
.-DATACTTIME 120-------. >>-+----------------------+------------------------------------>< '-DATACTTIME --seconds-'
DATACTTIME 160 ; wait 160 seconds
See the FTP command and the FTP environment information in z/OS Communications Server: IP User's Guide and Commands.