This scenario illustrates the basic Downstream Physical Unit (DSPU) over virtual data-link control (VDLC) configuration of the routers and relates the router configurations to the 3270 client setup and the XCA Major Node and the Switched Major Node definitions in Virtual Telecommunications Access Method (VTAM). Figure 1 and Figure 2 show the network setup for DSPU over VDLC test. Figure 3 details the relationships between configuration parameters (the OS/390 Input/Output Configuration Program [IOCP] generation commands were removed to improve readability). In this scenario, the Channel Interface Processor (CIP) connects to the host via an ESCON Director and the routers are connected by Token Ring. This document assumes knowledge of the command structure but not the parameter relationships.
Figure 1: DSPU over VDLC Network Scenario
Figure 2: Logical View of DSPU over VDLC
Figure 3: DSPU over VDLC Parameter Relationships