HULFT7 Communication mode

In HULFT8 or higher, the communication methods for connecting to the remote host have changed.

HULFT7 does not support the functions and the communication methods that have been added in HULFT8 or higher. Refer to the following for details on the functions and the communication methods that have been added in HULFT8 or higher:

HULFT10 New Features and Compatibility Guide : Added features of HULFT10

 

When connecting to a remote host, HULFT10 tries to connect using the enhanced communication method first. When it checks the response and determines that the remote host is HULFT7, it connects to that host using a downward-compatible communication method.

Therefore, it takes more time to connect to HULFT7 than to HULFT8 or higher.

Figure 2.26 Operation When Use HULFT7 Comm. Mode Is Specified as 'N' (No)

If the remote host is HULFT7, you can avoid this delay by enabling the HULFT7 Communication mode, which uses a downward-compatible communication method.

To use HULFT7 Communication mode, specify 'Y' (Yes) for the Use HULFT7 Comm. Mode (HUL7MODE) in the Host Information for each host.

Specify the Use HULFT7 Comm. Mode as 'Y' (Yes) to connect using the downward-compatible communication method from the start, regardless of the remote host's version.

For details about the Host Information, refer to the following:

HULFT10 for zOS Operation Manual : Host Information

Figure 2.27 Operation When Use HULFT7 Comm. Mode Is Specified as 'Y' (Yes)

Note

If the remote host is HULFT8 or higher and you specify the Use HULFT7 Comm. Mode (HUL7MODE) as 'Y' (Yes), the following functions of HULFT8 or higher are restricted:

  • If the ID of a record in the management information is 9 bytes or more, an error occurs.

    Even if an error occurs, the Send Multiplex Level may still be consumed.

  • Even when you specify a Long Message, it is not sent to remote hosts.

  • Depending on the timing of the error, the correct remote host name may not be output to the log.

  • Data is transferred without compression even when you specify DEFLATE.

Affected Communication

The following kinds of communication are affected by the setting of the Use HULFT7 Comm. Mode in the Host Information:

  • Send processing

  • Resend processing

  • Send Request

  • Resend Request

  • Remote Job Execution request

  • Job Execution Result Notification