System Overview 1-19DC Power Distribution (Redundant Systems)Figure 1-17 shows the power distribution scheme for the redundant powerconfiguration.Figure 1-17. Power Distribution (Redundant System)powersupply # 1powersupply # 2+5 VFPPSON#–5 VDC+12 VDC–12 VDC+5 VDC+3.3 VDC+5 VFPPSON#–5 VDC+12 VDC–12 VDC+5 VDC+3.3 VDC+5 VFPPSON#–5 VDC+12 VDC–12 VDC+5 VDC+3.3 VDC+12 VDC+5 VDC+3.3 VDC+12 VDC+5 VDC+3.3 VDC+12 VDC+5 VDC+12 VDC+5 VDCPWR1SCSI backplane (six drive bays)FLOPPY123456CD-ROMcontrol panelspeakerpower-onLEDon/offreset3 X 6 LEDssystem boardpowermanagementlogicRTC/NVRAMPWR- EISA1throughEISA3PCI4throughPCI8–12 VDC+12 VDC–5 VDC+5 VDC+5 VFP+3.3 VDCPSON#PWR-+3.3 VDC+5 VDC+12 VDC–12 VDC–5 VDC+12 VDC–12 VDC+5 VDCbatterybattery (+3 VDC)+3.3 VDCPWR-+5 VFPSMBbackplaneprocessorcoreregulator (2)main memorysocketsDIMM AthroughDIMM HPROCESSOR 1andPROCESSOR 2KEY-BOARDMOUSEFAN1throughFAN5+3.3 VDCcore VCC (+2.1 to +3.5 VDC)fuse+12 VDC+5 VDC+5 VDCGTLregulator+1.5 VDCP6 signal terminatorsP1–5P1–5power-supplyparallelingboard+5 VFP from SCSI backplane+5 VFP to SCSIbackplaneBATVBATVPWR2PWR3PWRSCSI(DDBP)PWRFD(FD1 – 4)NOTE: A server managementcable (16-pin) carries the +5 VFPfrom the system board to theSCSI backplane. The controlpanel cable (30-pin) carries the+5 VFP from the backplane to thecontrol panel.
