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What needs to be known about power and power over Ethernet (POE) options?

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What needs to be known about power and power over Ethernet (POE) options?

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There are two types of POE. The layer 2 switch can provide power or the power unit sits mid-span between the switch and the phones. The first is a logical choice allowing centralized battery backup in case of loss of power. The mid-span power unit would be used if a customer has a large investment in the current switches and does not want to replace them. Providing local power to the station telephone is an alternative. In case of power failure, stations will cease operation unless a universal power supply (UPS) is deployed to each station.

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