IBM pSeries 670, Service Manual

Page: 71 / 1032

I/O Subsystem Features
I/O subsystems have two redundant power supplies. One of these power supplies is capable of providing
the necessary voltages and currents, independent of the other power supply. The left and right
power-supply output voltages are connected and monitored by the power distribution board contained in
the I/O subsystem.
The left and right power supplies are hot-pluggable and may be changed one at a time while the system is
operational. Each power supply provides 5V dc, 3.3V dc, 12V dc, and 5V dc standby.
I/O to Processor Relationships
The following illustration shows the relationship between the I/O books, L3 cache, and the MCM modules:
Memory
Slot
0
Bus Bar
Memory
Slot
3
Memory
Slot
1
Memory
Slot
2
GX
Slot
0
(680-PIN)
GX
Slot
3
(680-PIN)
GX
Slot
1
(680-PIN)
GX
Slot
2
680-PIN)
Bus Bar
Bus Bar
Bus Bar
MCM
Module 0
MCM
Module 2
clock
A
C
A
D
B
L3
L3
L3
L3
L3
L3
L3
L3
A B
C
D
GX
0A
GX
0C
GX
3D
GX
3B
GX
3A
GX
3C
GX
2D
GX
2B
GX
0B
GX
0D
GX
1C
GX
1A
GX
1B
GX
1D
GX
2C
GX
2A
3
0
1
2
8
9
10 11
(0)
(1)
(3)
(2)
(5)
(4) (7)
(6)
(9)
(11)
(10)
(13)
(NC)
(NC)
(12)
(8)
I/O Subsystem Power Supply (DCA) LED Status
Use the following table to determine the condition of the I/O subsystem power supply (DCA) based on the
status of the power supply LEDs.
Status of LED Operator Panel LED Right Power Supply LED Left Power Supply LED
Off No power connected No power connected or
system power connected,
not turned on, power supply
detects no faults No power connected or
system power connected,
not turned on, power supply
detects no faults
On, fast blinking green, on
for one second, off for one
second System power connected,
power on initiated System power connected,
not turned on, power supply
detected fault System power connected,
not turned on, power supply
detected fault
Chapter 1. Reference Information
51