What are the differences among N+0, N+1, and N+N backup modes of power modules

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For CE series switches:
In N+1 backup mode, N power modules provide power supply, and one power module acts as a backup. If one power module fails, the redundant power module provides power supply to ensure normal operations of the switch.
In N+N backup mode, N power modules provide power supply, and N power modules act as backups. Even if all the N primary power modules fail, the N redundant power modules can still ensure normal operations of the switch.
In N+0 mode, N power modules provide power supply, and no redundant power module is available. If one power module fails and the total output of the other power modules is smaller than the actual power consumption of the switch, the switch cannot run properly.

Other related questions:
Do S series switches support N:1 or 1:N mirroring
S series switches all support N:1 mirroring, in which packets are copied from N mirrored ports to one observing port, and there is no limit on the number specified by N. 1:N mirroring copies packets on one mirrored port to N observing ports. M:N mirroring copies packets on M mirrored ports to N observing ports. In M:N mirroring, the number of mirrored ports is not limited, and the number of observing ports is the same as that in 1:N mirroring. The observing ports supported by S series switches are different. For details, see: - S1720&S2700&S5700&S6720 series switches 1:N Mirroring Specifications - S7700&S9700 series switches 1:N Mirroring Specifications - S12700 series switches 1:N Mirroring Specifications - S9300&S9300E&S9300X series switches 1:N Mirroring Specifications

Do CE switches support 1:N mirroring
CE12800 series switches support 1:N mirroring. On a CE12800E switch, 1:N mirroring is not supported in traffic mirroring. CE8800&7800&6800&5800 series switches support 1:N mirroring in port mirroring but not in traffic mirroring.

Do CE switches support N:1 mirroring
CE series switches support N:1 port mirroring. That is, packets on N ports can be copied to one observing port.

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