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4: System Control
L1 Controller Functions
The following list summarizes the control and monitoring functions that the L1 controller
performs:
• Controls voltage margining within the IRUs
• Controls and monitors IRU fan speeds
• Reads system identification (ID) PROMs
• Monitors voltage levels and reports failures
• Monitors and controls warning LEDs on the IRU
• Monitors the On/Off power switch
• Monitors the reset switch and the nonmaskable interrupt (NMI) switch
• Reports the population of the PCI cards and the power levels of the PCI slots in installed I/O
blades
• Powers on the PCI slots and their associated LEDs
L1 Front Panel Display
Figure 4-2 shows the L1 controller front panel features.
Figure 4-2 L1 Front Panel
inside
TM
Service-required LED
F
ailure LED
Power button
with LED
Reset
L1 controller display
NMI