The SCM communicates with the PCI backplane managers (PBMs), the hierarchical switch power manager (HPM), and the QBB power system managers (PSMs) distributed throughout the CSB subsystem. The subsystem has a power source separate from the rest of the system called auxiliary voltage (Vaux). Vaux enables the subsystem to be turned on from a remote site when the main system breaker is on and the system is plugged in.

Using the System Control Manager 8-3

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Compaq GS160, GS80, GS320 manual Using the System Control Manager