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The data pairs are used. Since Ethernet pairs are tra
center tap of the isolation transformer without upsetti
and the pair on pins 1 and 2 can be of either polarity.
nsformer coupled at each end, it is possible to apply DC power to the
ng the data transfer. In this mode of operation the pair on pins 3 and 6
Figure 2 - Power Supplied over the Data Pins
When to install PoE?
Consider the following scenarios:
• You're planning to install the latest VoIP Phone system to minimize cabling building costs when your company moves into
new offices next month.
• The company staff has been clamoring for a wireless access point in the picnic area behind the building so they can work
power to the outside is not affordable.
References:
IEEE Std 802.3af-2003 (Amendment to IEEE Std 802.3-2002, including IEEE Std 802.3ae-2002), 2003 Page(s):0_1-121
White Paper on Power over Ethernet (IEEE802.3af)
http://www.poweroverethernet.com/articles.php?article_id=52
on their laptops through lunch, but the cost of electrical
• Management asks for IP Surveillance Cameras and business access systems throughout the facility, but they would
rather avoid another electrician's payment.
Microsemi /PowerDsine
http://www.microsemi.com/PowerDsine/
Linear Tech
http://www.linear.com/