I/O Subsystem Features - 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)
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
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
GX
0B
(3)
GX
0D
(2)
GX
1C
(9)
GX
1A
(8)
GX
1B
(11)
GX
1D
(10)
GX
2C
(5)
GX
2A
(4)
Chapter 1. Reference Information
65