Can a CE12808 switch be configured with four power modules in the 2+2 backup mode

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The 2+2 power module configuration is supported as long as the output power of the power modules is sufficient for the switch.

Other related questions:
Backup of dual power slots on S series switches
Support of power slots on S series switches is as follows: 1. The switches that have PWR in their names (except the S2700-9TP-PWR-EI, S2750-20TP-PWR-EI-AC, S2750-28TP-PWR-EI-AC, S2751-28TP-PWR-EI-AC, S5700-PWR-LI, S5720-PWR-LI, and S5720S-PWR-LI series) support dual PoE power modules. 2. The switches that have C or PC in their names support dual power modules. 3. The S5720-SI series support dual power modules (except the S5720-14X-PWH-SI-AC, S5720-28X-SI-24S-AC, S5720-28X-SI-24S-SC, and S5721-28X-SI-24S-AC). When a switch has dual power modules installed: - For a PoE switch, the two power modules work in 1+1 redundancy mode to provide power for the chassis and provide power for PDs in load balancing mode. - For a non-PoE switch, the power modules provide power for the chassis in 1+1 redundancy mode. You can use Hardware Query Tool to query details.

What is the working mode of power modules on CE series switches
Description
What is the working mode of power modules on a switch?
Solution
By default, power modules on a switch work in load balancing mode. The software of power modules equally distributes power consumption to all the power modules.
You can change the working mode of power modules through the CLI if required.

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