KX-NT700RU - Panasonic PBX Service Manual (repair manual). Page 7

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This Power Supply Circuit supports the power supply through an Ethernet line called PoE (Powerover Ethernet) as well as the input
from a regular AC adapter.

In addition, there is a battery backup circuit for the preservation of the Call Log Data, the telephone book, and time at the power-off.

The power supply is as follows;