Coding IMS system definition macro statements for XRF

When you define the IMS system, you specify certain keywords on the macro statements that are in your existing generation deck.

XRF keywords appear in the following system definition macros:

• COMM
• CTLUNIT
• IMSCTRL
• LINE
• LINEFRP
• MSLINK
• MSPLINK
• STATION
• TERMINAL
• TYPE

For some resources, such as MSC links, the resource might be defined dynamically. In this case, you will not have a corresponding system definition macro.

For the syntax of the system definition macro statements, see IMS Version 15 System Definition.

XRF requires that you code the keywords that:

• Establish XRF support for IMS
• Provide two VTAM® application names
• Name two passwords for ACB security
• Define your master and secondary IMS terminals

You can use the defaults on other keywords that define what happens to terminals at a takeover. The defaults allow you to change IMS support at takeover and change the priority that IMS uses to recover sessions at takeover. If you allow XRF to use the defaults on the macros and ETO descriptors that define your terminals, you receive the best recovery IMS can give your terminals. The default priority for IMS to recover sessions at takeover is 4, with 7 being the highest priority.