z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures
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X-side / Y-side

z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures
GC27-3667-00

Figure 1 shows that how VTAM® determines which side will be the X-side and which side will be the Y-side. In this example, the operator in subarea 4 is the first to activate the link. Subarea 4 begins as the X-side and then switches to the Y-side.

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