IBM p5 550 Technical Overview And Introduction

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Contents

30 p5-550 Technical Overview and IntroductionEach RIO-2 port can operate at 1 GHz in bidirectional mode and is capable of passing data ineach direction on each cycle of the port. Therefore, the maximum data rate is 4 GB/s per I/Odrawer in double barrel mode.There is one default primary RIO-2 loop in any p5-550 system. This feature provides tworemote I/O ports for attaching up to four 7311 Model D20 I/O drawers to the system in a singleloop. The optional RIO-2 expansion card can be used to increase the number of I/O drawersconnected to one p5-550 system, and the same rules of the default RIO-2 loop must beconsidered. Figure 2-10 shows how you could logically connect four I/O drawers to onep5-550 system. Actual cables should be routed according to installation instructions.Figure 2-10 RIO-2 connectionsThe 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 cablingSPCN 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 thep5-550 system to SPCN port 0 on the first I/O drawer. The loop is closed connecting theSPCN port 1 of the I/O drawer back to the port 1 of p5-550 system. If you have more than oneI/O drawer, you continue the loop connecting the following drawer (or drawers) with the samerule.I/O drawer #1I/O drawer #2I/O drawer #3I/O drawer #4I/O drawer #3I/O drawer #4I/O drawer #1I/O drawer #2Cost Optimized Performance OptimizedPCI-X slots