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Poe (Power over Ethernet)

July 8, 2021 by Niall Caffrey

Traditionally PSTN phones were powered by the PBX or Telephone Exchange, while IP Telephones need power from a data cable (PoE) or from an AC Adapter. Most modem routers and switches are PoE enabled. CAT5, and later cables, have 4 pairs of wires. PoE sacrifices one pair to carry power.

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