Luyện thi THPT QG 2018Application Overview Power-over-Ethernet
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Application Overview Power-over-Ethernet
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Final approval of the Power-over-Ethernet (PoE) standard in June 2003, removed a significant barrier to widespread adoption of IP telephony. The standard (IEEE 802.3af) specifies how to supply power to compliant devices over Ethernet LAN cabling. Armed with uninterruptible power supplies (UPS), IT staff can now deploy Voice over IP (VoIP) telephones without worrying about them not functioning during a power outage. The benefits of this enabling technology extend beyond IP telephony. Many applications that deploy equipment with low power requirements in areas that aren't already wired for power will benefit from reduced cabling costs. A single standard Ethernet cable will now be able to provide both power...
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