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System Overview 1-19
DC Power Distribution (Redundant Systems)
Figure 1-17 shows the power distribution scheme for the redundant power
configuration.
Figure 1-17. Power Distribution (Redundant System)
power
supply # 1
power
supply # 2
+5 VFP
PSON#
–5 VDC
+12 VDC
–12 VDC
+5 VDC
+3.3 VDC
+5 VFP
PSON#
–5 VDC
+12 VDC
–12 VDC
+5 VDC
+3.3 VDC
+5 VFP
PSON#
–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 VDC
PWR1
SCSI backplane (six drive bays)
FLOPPY
1
2345
6
CD-ROM
control panel
speaker
power-on
LED
on/off
reset
3 X 6 LEDs
system board
power
management
logic
RTC/
NVRAM
PWR-
EISA1
through
EISA3
PCI4
through
PCI8
–12 VDC
+12 VDC
–5 VDC
+5 VDC
+5 VFP
+3.3 VDC
PSON#
PWR-
+3.3 VDC
+5 VDC
+12 VDC
–12 VDC
–5 VDC
+12 VDC
–12 VDC
+5 VDC
battery
battery (+3 VDC)
+3.3 VDC
PWR-
+5 VFP
SMB
backplane
processor
core
regulator (2)
main memory
sockets
DIMM A
through
DIMM H
PROCESSOR 1
and
PROCESSOR 2
KEY-
BOARD
MOUSE
FAN1
through
FAN5
+3.3 VDC
core VCC (+2.1 to +3.5 VDC)
fuse
+12 VDC
+5 VDC
+5 VDC
GTL
regulator
+1.5 VDC
P6 signal terminators
P1–5
P1–5
power-supply
paralleling
board
+5 VFP from SCSI backplane
+5 VFP to SCSI
backplane
BATV
BATV
PWR2
PWR3
PWRSCSI
(DDBP)
PWRFD
(FD1
–
4)
NOTE: A server management
cable (16-pin) carries the +5 VFP
from the system board to the
SCSI backplane. The control
panel cable (30-pin) carries the
+5 VFP from the backplane to the
control panel.