Connecting RIO and SPCN Cables
The RIO and SPCN cables provide two functions in the 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 primary
I/O drawer.
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 primary I/O drawer.
Chapter 1. Reference Information 49
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