30 Nov '14, 2am

Here is the best book I have found on Power over Ethernet for designers

Here is the best book I have found on Power over Ethernet for designers

Title: Power over Ethernet Interoperability Author: Sanjaya Maniktala Publisher: The McGraw-Hill Companies, Inc. Copyright: 2013 by The McGraw-Hill Companies, Inc. ISBN: 0071798250 / 9780071798259 Power over Ethernet (PoE) was a solution to a problem in Voice over Internet Protocol (VoIP) systems. Traditional phones were supplied by 48V DC power coming from the Phone Company Central Office (CO). VoIP phones had no CO, but instead used the Customer’s premise Network using wall adapters. Reliability proved a problem here since a loss of power meant loss of phone service as well. Cisco, in 2000, began putting 48V DC on the LAN data cables with data traffic signals as well thereby eliminating the wall adapters. Around 2001/2 IP Phone manufacturers and Wireless Access Point suppliers began to use this technique instead of the local 110V power. This is when the IEEE stepped in w...

Full article: http://www.edn.com/design/power-management/4437769/Book-R...

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