Intel Entry Redundant Power 2U ERP2U Design Manual page 20

DC connect at the same time as the module is inserted into the cage. No damage to the connector contacts
shall occur. The module may power on or come up into standby mode.
Many variations of the above are possible. Supplies need to be compatible with these different variations
depending upon the sub-system construction. In general, a failed (off by internal latch or external control) supply
may be removed, then replaced with a good power supply, however, hot swap needs to work with operational as
well as failed power supplies. The newly inserted power supply may get turned on by inserting the supply into the
system or by system management recognizing an inserted supply and explicitly turning it on.
ERP2U Power Supply Design Guide, V1.0
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SSI