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When the OSCT entry indicates that parallel sessions are supported, an external BIND request to establish a single session link is accepted, and a single session link is set up. An external BIND request to establish a parallel session link is accepted and session limits negotiation is initialized.
For a parallel session link, the product region initializes the link session limit as the sum of the session limits for each mode defined for the link. An attempt is made to initially activate sessions within each mode to at least reach the minimum contention winner counts for the mode. Additional sessions may be activated if conversation demand cannot be immediately serviced by the available sessions.
During link initialization a special transaction known as Change Number of Sessions (CNOS) is executed for parallel links. This transaction negotiates the session limits for the defined modes before sessions are established. The CNOS transaction may be subsequently invoked on demand, such as by remote LU request, to renegotiate session limits at any stage of link operation.
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