Chapter 2. Architecture and technical overview
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2.10.4 7311 Model D11 and Model D20 I/O drawers and RIO-2 cabling
As described in 2.10, “External I/O subsystems” on page 50, we can connect up to four I/O
drawers in the same loop, and up to 20 I/O drawers to the p5-570 system.
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 GBps per I/O
drawer in double barrel mode (using two ports).
There is one default primary RIO-2 loop in any 570 building block. This feature provides two
Remote I/O ports for attaching up to four 7311 Model D11 or 7311 Model D20 I/O drawers or
7311 Model D10 to the system in a single loop. Different I/O drawer models can be used in
the same loop, but the combination of I/O drawers must be a total of four per single loop. The
optional RIO-2 expansion card may be used to increase the number of I/O drawers that can
be connected to one 570 building block, and the same rules of the default RIO-2 loop must be
considered. The method that is used to connect the drawers to the RIO-2 loop is important for
performance.
Figure 2-18 shows how you could connect four I/O drawers to one p5-570 building block. This
is a logical view; actual cables should be wired according to the installation instructions.
Figure 2-18 RIO-2 cabling examples
RIO-2 cables are available in different lengths to satisfy different connection requirements:
Remote I/O cable, 1.2 m (FC 3146, for between D11 drawers only)
Remote I/O cable, 1.75 m (FC 3156)
Remote I/O cable, 2.5 m (FC 3168)
Remote I/O cable, 3.5 m (FC 3147)
Remote I/O cable, 10 m (FC 3148)
Note:
If you have 20 I/O drawers, although there are no restrictions on their placement, this
can affect performance.
I/O drawer #1
I/O drawer #2
I/O drawer #3
I/O drawer #4
PCI-X slots
I/O drawer #1
I/O drawer #2
I/O drawer #3
I/O drawer #4
Cost Optimized
Performance Optimized
