7311 Model D20 I/O Drawer Spcn Cabling - IBM p5 550 Technical Overview And Introduction

Each RIO-2 port can operate at 1 GHz in bidirectional mode and is capable of passing data in
each direction on each cycle of the port. Therefore, the maximum data rate is 4 GB/s per I/O
drawer in double barrel mode.
There is one default primary RIO-2 loop in any p5-550 system. This feature provides two
remote I/O ports for attaching up to four 7311 Model D20 I/O drawers to the system in a single
loop. The optional RIO-2 expansion card can be used to increase the number of I/O drawers
connected to one p5-550 system, and the same rules of the default RIO-2 loop must be
considered. Figure 2-10 shows how you could logically connect four I/O drawers to one
p5-550 system. Actual cables should be routed according to installation instructions.
Figure 2-10 RIO-2 connections
The RIO-2 cables used have different lengths to satisfy the different connection requirements:
Remote I/O cable, 3.5 m (FC 3147)
Remote I/O cable, 10 m (FC 3148)

2.8.4 7311 Model D20 I/O drawer SPCN cabling

SPCN is used to control and monitor the status of power and cooling within the I/O drawer.
The SPCN is a loop (Figure 2-11 on page 31), the cabling starts from SPCN port 0 on the
p5-550 system to SPCN port 0 on the first I/O drawer. The loop is closed connecting the
SPCN port 1 of the I/O drawer back to the port 1 of p5-550 system. If you have more than one
I/O drawer, you continue the loop connecting the following drawer (or drawers) with the same
rule.
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p5-550 Technical Overview and Introduction
Cost Optimized
PCI-X slots
I/O drawer #1
I/O drawer #2
I/O drawer #3
I/O drawer #4
Performance Optimized
I/O drawer #3 I/O drawer #1
I/O drawer #4 I/O drawer #2