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Connecting RIO and SPCN Cables
The RIO and SPCN cables provide two functions in the S80 and S85 system: remote
data bus connection and power control. The following basic rules must be followed
when connecting these two types of cables:
v The I/O drawers must be connected in a loop fashion for both the RIO cables and
the SPCN cables. The loop connection provides redundant paths so that if a failure
occurs in part of a cable, the system will continue to operate. If a failure occurs, a
warning message is displayed on the system console but the system continues to
operate.
v One loop is required for the SPCN cabling. This loop begins and ends at the system
rack.
v Two loops are possible for the RIO cabling depending on the number and desired
configuration of I/O drawers. These loops begin and end at the system rack.
RIO Cabling
The following rules apply to RIO cable connections:
v I/O drawers 0 and 1 are connected using the first RIO loop, which uses RIO ports 0
and 1 on the system rack.
v I/O drawers 2 and 3 are connected using the second RIO loop, which uses RIO ports
2 and 3 on the system rack.
v The primary I/O drawer must be installed and connected to RIO port 0 of the system
rack. The connection must be made from RI0 port 0 of the system rack to RIO port 0
of the primary I/O drawer. This connection is required to make the primary drawer the
first drawer in the loop, which allows the firmware to initialize the system.
v If the loop connection between RIO 2 and RIO 3 is broken, the system is not able to
differentiate between I/O drawer 2 and I/O drawer 3. The system still configures RIO
0 and RIO 1 ports, but does not configure RIO 2 or RIO 3 ports.
The following figures provide cabling examples of all valid cabling configurations. Match
your configuration to the correct figure and connect your RIO cables as shown.
Appendix D. Cabling the System Rack and I/O Rack 57