Defining APPNTOSA and SATOAPPN class of service mapping tables

Rather than resolving the logon mode name to a subarea or APPN class of service at each APPN or subarea network boundary, you can choose to map subarea classes of service to APPN classes of service, and vice versa. This is done by coding a subarea-to-APPN COS mapping table (SATOAPPN) and an APPN-to-subarea (APPNTOSA) COS mapping table. These tables are used at any VTAM® that must choose an APPN or subarea Class of Service when the corresponding Class of Service (subarea or APPN) is already known.

Note: If subarea-to-APPN or APPN-to-subarea COS mapping tables are defined, these tables are used instead of resolving the logon mode name to an appropriate APPN or subarea COS using the logon mode table for the secondary LU. If COS mapping tables are not defined, or a matching entry is not found, the logon mode table for the SLU is used to resolve the logon mode name to an appropriate APPN or subarea Class of Service.