The hierarchical switch links the QBBs in systems having more than one system box. Figure 2–16 shows cable connectors for each system box (a pair of connectors for two signal cables routed to each QBB global port in the system).

The hierarchical switch power manager (HPM) module controls power and monitors the temperature inside the hierarchical switch housing. The HPM module, along with the PSM modules and PBM modules, report status information to the SCM.

GS160/320 System Overview 2-21

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Compaq GS80, GS320 manual GS160/320 System Overview