IBM eserver pSeries 7311 D10 - Page 23

Four I/O Subsystems, Eight I/O Subsystems: The illustration on the left shows four
I/O subsystems connected to the processor subsystem using one SPCN loop. The
illustration on the right shows eight I/O subsystems connected to the processor
subsystem using one SPCN loop.
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Chapter 1. Reference Information 7