IBM eserver pSeries 690 Installation Manual page 94

The following illustration shows the location codes for the secondary rack. These codes
are used to identify the major functional units in the pSeries 690 systems.
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pSeries 690 Installation Guide
U2.19
U2.17-P1-V5
U2.13
U2.9
U2.5
U2.1
FRONT
U2.19
U2.17-P2-V6
U2.13
U2.9
U2.5
U2.1
REAR