I/O Subsystem Features; I/O To Processor Relationships; I/O Subsystem Power Supply (Dca) Led Status - IBM pSeries 690 Service Manual

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:
GX
0A
(0)
GX
0C
(1)
GX
3D
(NC)
GX
3B
(NC)
GX
3A
(12)
GX
3C
(13)
GX
2D
(6)
GX
2B
(7)

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
Off
On, fast blinking green, on
for one second, off for one
second
L3 L3
Module 0
A
L3 L3
Bus Bar
C
13
14
B
D
MCM
Module 3
C
A 15
12
D
Bus Bar
B
L3
L3
Module 2
L3 L3
Operator Panel LED
No power connected
System power connected,
power on initiated
L3 L3
MCM
0
1
B
L3 L3
Bus Bar
D
2
3
A
4
7
A
C
MCM
clock
Module1
D
B
5 6
10 11
C
Bus Bar
A
L3
L3
8
9
MCM
L3
L3
Right Power Supply LED
No power connected or
system power connected,
not turned on, power supply
detects no faults
System power connected,
not turned on, power supply
detected fault
GX
0B
(3)
GX
0D
(2)
GX
1C
(9)
GX
1A
(8)
GX
1B
(11)
GX
1D
(10)
GX
2C
(5)
GX
2A
(4)
Left Power Supply LED
No power connected or
system power connected,
not turned on, power supply
detects no faults
System power connected,
not turned on, power supply
detected fault
Chapter 1. Reference Information
65