Oracle SuperCluster T5-8 Owner's Manual page 319

The following terms are used when referring to the two racks:
Rack 1 (R1) refers to Oracle SuperCluster T5-8 (Half Rack)
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Rack 2 (R2) refers to the Oracle Exadata Storage Expansion Quarter Rack
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In addition, because the InfiniBand switches are physically located in different rack units in the
two racks, the following terms are used when referring to the InfiniBand switches:
InfiniBand 1 (IB1) refers to the spine switch, located in U1 in Oracle SuperCluster T5-8
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InfiniBand 2 (IB2) refers to the first leaf switch, located in:
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U26 in Oracle SuperCluster T5-8 (Half Rack)
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U20 in the Oracle Exadata Storage Expansion Rack
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InfiniBand 3 (IB3) refers to the second leaf switch, located in:
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U32 in Oracle SuperCluster T5-8 (Half Rack)
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U24 in the Oracle Exadata Storage Expansion Rack
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The following table shows the cable connections for a single Oracle Exadata Storage Expansion
Quarter Rack to the Half Rack version of Oracle SuperCluster T5-8.
TABLE 86 Leaf Switch Connections for the First Rack in a Two-Rack System
Leaf Switch
R1-IB3 to Rack 2
Connecting an Expansion Rack to Oracle SuperCluster T5-8
Connection
R1-IB3-P2A to R2-IB3-P2A
Cable Length
5 meters
Connecting Expansion Racks 319