There are two pacing stages for an application program-to-local SNA device session over a CTCA connection. Stage x uses adaptive pacing and stage y can use either adaptive or fixed pacing. Figure 1 shows the pacing stages for this example. See Table 1 and Table 2 for examples of the values used by VTAM® to set the pacing window values. Table 1 shows sample definition statement coding and corresponding windows when data flows from the PLU to the SLU. Table 2 shows sample definition statement coding and corresponding windows when data flows from the SLU to the PLU.