Considerations for the SWTDSC parameter that can affect error recovery

By default, the value for the switched disconnect (SWTDSC) parameter is set to *YES for advanced program-to-program communications (APPC). This setting is the best for switched connections. It allows a switched line to be disconnected when the application is no longer using the line. You may want to consider changing the parameter value for error recovery to eliminate unnecessary disconnections. These unnecessary disconnections cause the iSeries™ server to do more work to disconnect then later reconnect. A common environment where this occurs is with personal computers on local area networks (LAN) that use the Client Access for Windows® or iSeries Access for Windows licensed program. The SWTDSC parameter is on the CHGCTLxxx or CRTCTLxxx command.

To change the SWTDSC parameter, consider the following:

• For personal computers that are connected to a local area network, set the SWTDSC parameter to *NO. Connections between personal computers with V installed, and the iSeries server may be automatically disconnected if the following conditions exist:
  • The V router is started
  • An application such as a 5250 emulation session or a network drive is not running over the connection
  • The application does not start within the time limit that is specified by the disconnect timer (DSCTMR) parameter
  Note:
  If you have a switched line that incurs charges, you should continue to use SWTDSC(*YES).

See the following references for more detail:

• For advanced configuration pages, see the Communications Configuration book.
• For more information about iSeries communications, see the Communications Management book.