Power Checking for PoE Module

PoE modules require more power than other I/O modules.

When a chassis containing a PoE module is booted or a new PoE module is inserted, the power drain is calculated. Before the PoE module is powered up, the chassis calculates the power budget and powers up the PoE module only if there is enough power. The chassis powers up as many I/O modules as possible with lower-numbered slots having priority.

Note

If your chassis has an inline power module and there is not enough power to supply the configured inline power for the slot, that slot will not power on; the slot will not function in data-only mode without enough power for inline power.

If a PoE module is inserted into a chassis, the chassis calculates the power budget and powers up the PoE module only if there is enough power. Installed modules are not affected. However, if you reboot the chassis, power checking proceeds as described in the previous paragraph. If there is now enough power, I/O modules that were not powered up previously are powered up.

If you lose power or the overall available power decreases, the system removes power to the I/O modules beginning with the highest numbered slots until enough power is available. Inline power reserved for a slot that is not used cannot be used by other PoE slots (inline power is not shared among PoE modules).

Before you install your PoE module, consult your sales team to determine the required power budget.

Published March 2020prev | next

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