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Power over Ethernet
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===Power sourcing equipment=== 802.3 refers to ''Power Sourcing Equipment'' (PSE), which provides power on the Ethernet cable. This device may be a [[network switch]], in the standard ''Endpoint PSE'' (commonly called an ''endspan device'') or a ''PoE injector'', ''Midspan PSE'' in the standard, an intermediary device between a switch that does not provide PoE (or one that cannot provide sufficient power) and a PoE-powered device.<ref>Cisco Aironet technotes on [http://www.cisco.com/en/US/docs/wireless/technology/poe/technical/reference/Power.html#wp40055 1000BASE-T Midspan PSE], {{Webarchive|url=https://web.archive.org/web/20110802220854/http://www.cisco.com/en/US/docs/wireless/technology/poe/technical/reference/Power.html#wp40055 |date=2011-08-02 }} visited 18 July 2011</ref>
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