Cabling the System Rack and I/O Rack
The minimum system consists of two racks. The system rack contains the system
processors, memory, and supporting hardware. The I/O rack contains I/O drawer(s) with
PCI adapters, disk drives, and media drives. The models S80 and S85 must have a
minimum of one I/O drawer. This primary I/O drawer contains the service processor for
the system. Additional I/O drawers can be added to the system. These secondary I/O
drawers are connected to the system rack but do not contain a service processor. The
models S80 and S85 supports up to a total of four I/O drawers in different I/O rack
configurations.
Use the following steps to connect the system rack to the I/O drawers in their I/O racks:
1. Connect the JTAG cable and the operator panel cable. These two cables are
connected only between the system rack and the primary I/O drawer. See
“Connecting JTAG and Operator Panel Cables” on page 32 for illustrations showing
these cables.
2. Connect the RIO cables, and the SPCN cables. These cables connect between the
system rack and all the I/O drawers in loops. See “Connecting RIO and SPCN
Cables” on page 32 for illustrations showing these cables.
Chapter 1. Reference Information 31
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