IBM eserver p Series Service Manual page 36

Processor Subsystem Connected to Three or Four Model D10 I/O Subsystems:
Processor Subsystem Connected to Three or Four Model D20 I/O Subsystems:
Eight I/O Subsystems with Two RIO Loops
The following illustrations show eight I/O subsystem drawers connected to the processor subsystem unit
using two RIO loops.
16 EserverpSeries 650 Service Guide
1 Processor Subsystem
2 I/O Subsystem
1
0
1
0
2
1
0
A1
A0
1
1 Processor Subsystem
2 I/O Subsystem
1
0
1
0
2
1
0
1
0
A1
A0