Abstract
The IBM eServer z900 introduces new Parallel Sysplex® coupling channels that satisfy evolving requirements in a way that minimizes product and development costs. Their design also provides backward compatibility with earlier S/390® models, spans all three coupling channel design points, and anticipates future end-of-life technology issues. The original intersystem channel (ISC) design was improved, and new features added, but the core chips were retained. This paper describes the efforts that led to the improved design.
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