SNA connections to LAN protocols

The system can connect SNA to a LAN protocol by using service access points (SAPs). Multiple SAPs enable you to have multiple connections between SNA and a LAN protocol, thus permitting multiple communication paths between independent applications.

You or the system specifies which SAPs to use in the line and controller descriptions. For SNA, the system can automatically create one SAP value (the default value). You might want to change this value or have additional SAPs if any of the following conditions apply:

• The remote system does not use the default source service access point (SSAP)
• You want parallel station-to-station connections between adapters (This might be desirable if you link two applications that require different controller descriptions.)
• You want station-to-station connections to the same adapters (You might want to do this to configure multiple SAPs to test an application on a single system.)