Example of automatic activation of adjacent link stations

Figure 1 shows an example of the automatic activation process. Assume that LSA is automatically activated when you activate NCP1. If you want to activate NCP2 through NCP1, first either manually activate LSB and LINKA or have them automatically activated (coded using RNAME=LSB).

Figure 1. Activating NCPs and link stations: Through another NCP

Going in the other direction, if you want to activate NCP2, LSC must be active or automatically activated. If you want to activate NCP1 through NCP2, you must manually or automatically activate LSD and LINKA. Figure 2 illustrates this concept.

Figure 2. Activating NCPs and link stations: Through host link station

If NCP1 was inactive when you tried to activate NCP2, the activation of LINKA and LSB would be delayed until NCP1 was activated. VTAM® would communicate with NCP2 through its channel connection (LSC).

Figure 3 shows an example of automatic activation of link stations.

Figure 3. Automatic activation of link stations

For Figure 3, the following is coded for NCP2:

               CUADDR=0C2,
               RNAME=LS1,

NCP1 is active. LINK1, LS1, and NCP2 are not.
Activate NCP2.
VTAM automatically activates LS3 (0C2-S) and LINK3 (0C2-L), enabling communication over LINK3. VTAM also automatically activates LS1 and LINK1, enabling communication through NCP1 over LINK1.

Following is an example of delayed automatic activation:

In Figure 3, NCP1, LINK1, LINK3, and NCP2 are inactive.
Activate NCP2.
VTAM automatically activates LS3 (0C2-S) and LINK3 (0C2-L), enabling communication over LINK3. VTAM delays automatic activation of LS1 and LINK1 until you activate NCP1.