External-to-Internal Power Supply Transfer

This section describes what happens if power from an external power module either fails or is disconnected.

Active Internal Power Supply with Single 600-LS Module Failure

When an EPS-C with a single EPS-600LS module is connected to the Summit X450e-48p or X250e-48p switch and the EPS-600LS fails or is disconnected, power is drawn from the internal power supply without power interruption to the PoE (Power over Ethernet)-connected devices.

Inactive Internal Power Supply with a Dual EPS-600LS Configuration and Module Failure

In an EPS-C2 chassis with two EPS-600-LS power modules, it is possible for one external power module to fail while the second power module continues to function. If one EPS-600LS fails, the PoE power budget is automatically reduced to 370 W for the Summit X450e-48p or X250e-48p switch. PoE port power management occurs as described in the Power over Ethernet section of the ExtremeXOS 16.2 User Guide. With only a single operating power module, the remaining EPS-600LS behaves as a redundant power module. The internal power supply is returned to an active state to provide redundant capability.

If both external power modules fail or are disconnected, PoE power is interrupted while transferring PoE power back to the internal power supply. The internal power supply is then limited to 370 W of PoE power. The PoE power budget is automatically adjusted accordingly. Power management will occur as described in the Power over Ethernet section of the ExtremeXOS 16.2 User Guide.