Talk:Power over Ethernet

I don't agree that this page should be speedily deleted. History of POE predates the IEEE standard, and similar to Wi-Fi and 10BASE-T it deserves its own article. I wrote a stub and put it in Talk:IEEE_802.3. Rhobite 22:41, Jul 5, 2004 (UTC)

Personally, I'm all for keeping this page. --Kwnd 17:21, 16 July 2005 (UTC)[reply]

I'm surprised there's no discussion of the EMI here. And, does POE have enough umph to power monitors in a thin client environment? If yes, which?--DennisDaniels 13:58, 14 December 2005 (UTC)[reply]

The current article says 16.8 watts. An old flat pannel I just checked wants 12v @ 4A = 48w, so offhand, I'd say NO. However, newer monitors might be closer. --ssd 21:05, 28 December 2005 (UTC)[reply]

I've found a thinclient with a monitor using POE. Pricing is not available as yet:

http://www.dspdesign.com/products/product_detail?product_id=118 --DennisDaniels 09:16, 3 February 2006 (UTC)[reply]

This article also contains many technical errors. Although a PoE switch can supply 15.4W, the maximum power garunteed to a device is 12.95W once you take into account cable losses. Don't have time to edit this page now, because it needs A LOT of work. I will have to remember to come back to it later. In the meantime, this page must be flagged for poor technical accuracy. For those of you that need real numbers, I suggest you read the standard which is linked at the bottom of the article. --Babar77 17:12, 5 January 2006 (UTC)[reply]

keep in mind there's also the more "homebrew" varieties of PoE which work equally well... we're currently using a version of the circuit mentioned here: http://www.wireless.org.au/~jhecker/poe/ to power orinoco AP2000s using a 12v supply from the linux firewall/router box. - --Darkaz 12:56, 6 April 2006 (UTC)[reply]

Where does the power come from?

When someone does get around to editing the page, please hear my request. I came looking for an answer to my (admittedly ignorant) question: "Where does the power come from?" In other words, assuming I connect a POE adapter to my router board, and connect it via ethernet cable to my switch, will the power come from the switch? Or do I have to plug the POE adapter into a wall outlet? I'm assuming it will get the power from the switch, but I wanted to be sure. I read the article but it didn't answer this question. (Or it did and I missed it.) Thanks. --Smithfarm 07:55, 22 May 2006 (UTC)[reply]

Advice against merging

I do not think that IEEE 802.3af and PoE should be merged into one article. IEEE 802.3af is a standard, but PoE in generel is a mix all kinds of PoE; good and bad. The bad ones do not probe for PD, and can damage network equipment.

I will remove paragraphs, that are better put in IEEE 802.3af and IEEE 802.3at. --Glenn 06:51, 17 June 2006 (UTC)[reply]

I agree with Glenn, PoE is concept. Cisco-EPS/3Com-EPS/IEEE802.11af-t etc.. are instances of the concept. PoE page as a gateway/portal to the specifics of each instance makes more sense. Though a short form description of each instance is useful for the casual reader to find out what it's all about. --Electron9 2006-06-19

Change Power Specifications

The power specifications are wrong. PoE and IEEE 802.3af are near identical, but vendors like Cisco have their own PoE specifications. I would mention this and keep them seperate. The power levels in Cisco PoE go up to 10watts. The IEEE standard goes up to 15.4 watts. The definition is wrong. Here's the power specs (p.41 of this link: http://standards.ieee.org/getieee802/download/802.3af-2003.pdf )

-Dennis

Agree merge is desirable, but should include midspans and RFC references

The technology for PoE includes other components, such as Midspan power delivery, structured cabling and powered switches, and SNMP management. Merge would provide opportunity to show how the items work together without chasing all over for links.

-- Kelley