NCP planning considerations for XRF with USERVAR

The primary planning task for Network Control Program (NCP) is deciding how many class-1 terminals you want to attach to each 37x5 Communication Controller. For each NCP, specify this number on the BACKUP operand on the BUILD definition statement. This action allows the NCP, through the SSP, to generate the appropriate number of control blocks for primary and backup sessions for class-1 terminals.

The 37x5 Communication Controllers connected to your class-1 terminals need not be dedicated to the IMS work. They can also support other network traffic, including gateway. As you plan the storage requirements for the gateway 37x5 Communication Controller that supports class-1 terminals, remember that this type of 37x5 Communication Controller requires more storage than a 37x5 Communication Controller without XRF terminals and without gateway.

Related reading: For more information on NCP storage, see z/OS® Communications Server: SNA Network Implementation Guide.