IBM SCM, Manual

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Table 3. Three System Node to System Control Unit Clock Card Cabling
Index Number From: (U-Loc) Cable Type Index Number To: (U-Loc)
1 U2: P1-T7 Short Clock Flex
Cable (Left) 2 U3: P1-C8-T2
3 U2: P1-T8 Short Clock Flex
Cable (Right) 4 U3: P1-C9-T1
5 U4: P1-T7 Long Clock Flex
Cable (Left) 6 U3: P1-C8-T3
7 U4: P1-T8 Long Clock Flex
Cable (Right) 8 U3: P1-C9-T4
9 U5: P1-T7 Long Clock Flex
Cable (Left) 10 U3: P1-C8-T4
11 U5: P1-T8 Long Clock Flex
Cable (Right) 12 U3: P1-C9-T3
e. If you have a four node system configuration, use the diagram and the Four System Node to
System Control Unit Table below to determine point to point cabling for the clock flex cables.
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Power Systems: SCM