There are five power rails with the names and source given in the following table. Each QSFP56 uses isolated power, delivered by a dedicated regulator to provide power enable and over-current control per port.
Note: While the card can operate without either AUX power
connected, power to the QSFP cages, DDR, and DIMMs requires at least AUX power
connector 1 to be connected.
Power Rail Name | Source |
---|---|
12V_PEX | PCIe Edge Connector |
3V3_PEX | PCIe Edge Connector |
3V3_AUX | PCIe Edge Connector |
12V_AUX1 | PCIe AUX Power Connector 1 |
12V_AUX2 | PCIe AUX Power Connector 2 |
The following figure shows the top-level power tree.
Figure 1. Power Tree