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Possible uses for Power over Ethernet

CmdrTaco posted more than 9 years ago | from the talk-amongst-yourself dept.

Technology 385

jsailor writes "Power over Ethernet allows devices to draw power from the Ethernet cable they use for networking. Power is provided by the LAN switch (end-span) or an intermediary device (mid-span). The current spec. is 802.3af and was covered on slashdot before. It provides approximately 13W at the end of a 100 m cable and is commonly used for IP phones, wireless access points, and increasingly security cameras. The technology saves costs associated with running power to the odd locations access points find themselves in and allows IP phones to be moved around with out carrying a power brick. The industry is considering a new standard that would provide up to 39W to a network device. Bizarre uses include electric razors. "

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DSSADSADAS (-1, Offtopic)

Anonymous Coward | more than 9 years ago | (#11108220)

pik og patTTER

LOL (-1, Offtopic)

Anonymous Coward | more than 9 years ago | (#11108226)

lol

Take the PoE line (-1, Flamebait)

Anonymous Coward | more than 9 years ago | (#11108230)

and jam it into your urethra ohh yeah

death to #oldwarez

Re:Take the PoE line (-1, Offtopic)

Anonymous Coward | more than 9 years ago | (#11108300)

death to #oldwarez

what?

Re:Take the PoE line (-1, Offtopic)

Anonymous Coward | more than 9 years ago | (#11108457)

spammers

Re:Take the PoE line (-1, Offtopic)

Anonymous Coward | more than 9 years ago | (#11108482)

yea

Re:Take the PoE line (-1, Offtopic)

Anonymous Coward | more than 9 years ago | (#11108489)

please explain

Re:Take the PoE line (-1, Offtopic)

Anonymous Coward | more than 9 years ago | (#11108552)

<daffa_> HEY DUDE!! Long time no see. Come u see new warez at #oldwarez !!!Watch girl get raped in bathroom. Girl gets fucked head to toilet. All of there blood. Hot warez moviez appz gamez XxX passwordz at #oldwarez ... join u now!! the Sekret Key is fahkoff ---> type /join #oldwarez fahkoff and see warez.

FP (-1, Offtopic)

Anonymous Coward | more than 9 years ago | (#11108233)

Microsoft SUX! Yee Haw!

Easy enough, (5, Funny)

00null00 (530499) | more than 9 years ago | (#11108235)

But isn't it time for power over wi-fi?

Re:Easy enough, (1, Funny)

Anonymous Coward | more than 9 years ago | (#11108285)

I'd much prefer power over BPL.

Re:Easy enough, (2, Insightful)

Vectorferret (814726) | more than 9 years ago | (#11108318)

Tesla (who worked with Edison on early electric devices) wanted to transmit electricity wirelessly. Edison ruled it out because you couldn't charge for it that way. It's a good thing Edison won out, as to get enough electricity to power anything useful into the air over any real distance would be a huge cancer risk.

Re:Easy enough, (0)

Anonymous Coward | more than 9 years ago | (#11108473)

I believe it was J. P. Morgan who pulled the plug on Tesla after he learned that Tesla had no plan for billing people for electricity usage.

Wireless Power (3, Interesting)

EqualSlash (690076) | more than 9 years ago | (#11108578)


Don't send it in the form of electricty..send it in the form of radiation energy just like how the Sun provides us energy wirelessly. Even NASA tested a Laser-Powered Aircraft [nasa.gov] last year.

Re:Easy enough, (4, Funny)

xpyr (743763) | more than 9 years ago | (#11108325)

Obligatory bash quote, see bash [bash.org]

harm_: today this one lady got pissed off cause we dont carry i quote wireless power supplies
ogregasm: a what
harm_: thats what i said
harm_: maybe you want an adaptor for a wireless router o rsomething??
harm_: shes goes no no i read online about this i wannit i wannit :harm_: then she got pissed when i told her that kind of technology doesnt exist
ogregasm: heh :harm_: i tried to be nice but it got to the point where i was like"get back to us in 30 years"
harm_: "once we attain the secret of positron deflector shields, wireless power supplies shall become a reality"
ogregasm: why bother being that much of an ass to the poor woman
harm_: well shes the one who got all up in my face asking for the store manager
harm_: i told her he had just teleported to a corporate meeting in tokyo

Ah gotta love bash :)

Re:Easy enough, (2, Interesting)

Ignignot (782335) | more than 9 years ago | (#11108338)

This is rated funny, but Nikola Tesla was working on something like this for much of his life. The Wyadcliffe (sp?) tower is just the biggest example. Go check it out on wikipedia [wikipedia.org] like you do for everything else.

Re:Easy enough, (1)

jdray (645332) | more than 9 years ago | (#11108443)

For that matter, everyone doing work on Solar Power Satellites [permanent.com] would be interested to know that this sort of thing is impossible.

Re:Easy enough, (0)

Anonymous Coward | more than 9 years ago | (#11108452)

Ahh, Wikipedia, the cause of, and the solution to all of life's problems.

Re:Easy enough, (1)

mrogers (85392) | more than 9 years ago | (#11108545)

I've played C&C Red Alert - there's no way I'm having one of those things in my back garden.

39 W is Enough for Whole Village in India (1, Informative)

Anonymous Coward | more than 9 years ago | (#11108391)

Couple this article with an older Slashdot article about bringing cheap broadband into remote villages in India, and you soon realize that the Ethernet cable could be a way to bring electricity into remote Indian villages that do not have electricity. You may say, "Well, this is ridiculous." This proposal is no more ridiculous than spending billions of dollars on high technology (e.g. GPS, cheap broadband, and others) to fix the SYMPTOMS of fundamental problems with Indian culture. No one wants to address the problems themselves (e.g. aborting female fetuses) because addressing the symptoms is more politically acceptable.

Admittedly Indian culture is somewhat better than Chinese culture [phrusa.org] , but we are really scraping the bottom of the barrel here.

ok, sure "Well, this is ridiculous" (1)

rednip (186217) | more than 9 years ago | (#11108610)

you soon realize that the Ethernet cable could be a way to bring electricity into remote Indian villages that do not have electricity...
I've got an idea that's even lower tech, just run a lampcord out. Then you can use the normal plugs...

You don't have to be an EE to know how stupid it is. If you think house cats can do some damage, just wait until your powere gets chewed up by a lion. All kidding aside, the longer the run the more loss of power, ethernet cables don't have the kind of sheilding needed for long distance transmition of power (by a long shot). Also remote villages have no infrastructure to the power plants (ie. 'telephone poles').

Re:Easy enough, (1)

pronobozo (794672) | more than 9 years ago | (#11108454)

who can say rdif

Electric Razor? (0)

Anonymous Coward | more than 9 years ago | (#11108239)

RoIP. Rash over IP?

Rexec?? (1)

hajihill (755023) | more than 9 years ago | (#11108498)

rexec -l username -n password razor shave -uname user

Seems Kinda Weird / Wired (1)

engywook (802813) | more than 9 years ago | (#11108243)

I guess there must be a market for this somewhere. It just seems to me that if you can manage to run a wire to carry the Ethernet networking signals, it should not be all that much more difficult to run some power at the same time.

Now, on the other hand, if this were providing power over an 802.11b/g connection, I'd be asking where to sign up!

Re:Seems Kinda Weird / Wired (2, Informative)

Enzo the Baker (822444) | more than 9 years ago | (#11108349)

Depending on the safety code for the area, you probably need an electrician to run power. You probably have to have conduit, junction boxes, run it back to the circuit breaker (which may be in a different place than your network switch), etc. If it's just Ethernet cable, you can probably have just about anyone run plenum rated cable wherever you want, without the extra hardware.

So for new construction, it's probably not a big deal. But for adding new devices to an existing facility, it could be a lot easier/cheaper.

Re:Seems Kinda Weird / Wired (1)

RetroGeek (206522) | more than 9 years ago | (#11108555)

Depending on the safety code for the area, you probably need an electrician to run power.

Normal voltage power, yes.

But 12 volt low current does not require the same rules. Anyone can run wires for a doorbell, even though it carries 12V DC.

So co-running a low voltage wire beside the LAN cable should not be a problem. If it is, then running the LAN cable would also be a problem.

Of course you need to set up the AC->DC converter and properly fuse it...

Re:Seems Kinda Weird / Wired (0)

Anonymous Coward | more than 9 years ago | (#11108407)

There is far more regulation re the running of electricity, plus, where I work, the electrical is a mess since the building is very old and has served several different manufacturing industries in its life. It can be a real trick to get a new box put in. OTOH, its trivial to run another drop for networking.

Re:Seems Kinda Weird / Wired (1)

cafn8ed (264155) | more than 9 years ago | (#11108408)

I don't know much about the underlying technology, but if the ethernet-delivered power is DC, then it could save some space, weight, and efficiency on the part of the electronics to not have to convert the AC current to DC before using it. In other words, no transformer brick needed for the device.

Re:Seems Kinda Weird / Wired (1)

runningduck (810975) | more than 9 years ago | (#11108493)

I would love for my TV to run on PoE. Then if my TiVo multicast channels [TV] life would be perfect.

What a shame... (1)

mansoft (371174) | more than 9 years ago | (#11108246)

The razor doesn't have networking capabilities!

Re:What a shame... (0)

Anonymous Coward | more than 9 years ago | (#11108404)

Imagine a beowulf cluster of razors!!! The Mach 3 model could run on 3 Blade servers.

Re:What a shame... (1)

laard (35526) | more than 9 years ago | (#11108439)

Sure it does... [motorola.com]

Hello moto...

Re:What a shame... (1)

Total_Wimp (564548) | more than 9 years ago | (#11108607)

The razor doesn't have networking capabilities!

I thought a similar thing the first time I saw one of those little laptop lights that plug into the USB port. Now devices that use USB just for power are extremely common and some are quite creative and useful. I love recharging my cell phone with a a USB cable because I dont' need an extra brick(transformer) to get the job done.

In fact, even though power over Ethernet is a great idea, I'll bet it's biggest competitor will continue to be good ol' USB. The only real advantage the Ethernet has is range and until it's commonly built into laptops and desktops It'll continue to be a very niche type of product.

TW

COOL! (1)

oGMo (379) | more than 9 years ago | (#11108254)

Now if I could have my PDA draw power from the wifi card, I wouldn't even need a battery!

Gigabit ethernet? (2, Interesting)

mgs1000 (583340) | more than 9 years ago | (#11108257)

I guess it won't be compatible with gigabit over cat5e, since that uses all eight wires.

Re:Gigabit ethernet? (1)

YankeeInExile (577704) | more than 9 years ago | (#11108394)

I sure hope your job isn't soothsayer.

There is no fundamental reason that DC power-pass could not be made to work with Gig-E, just as a single pair can simultaneously carry RF, DC power, and a tuning voltage (the feedline to the LNB for a DBS satellite).

Re:Gigabit ethernet? (5, Informative)

enigmals1 (667526) | more than 9 years ago | (#11108511)

Yes you can. The power is running on the same wires as the data. This is roughly the same technology as Broadband Over Power. The power is 60Hz but the data is MHz...or in your case, GHz. Little to no crosstalk.

Stop the craziness! (5, Funny)

whysanity (231556) | more than 9 years ago | (#11108263)

Power over Ethernet?
Internet over Powerlines?

What crazy things will they think of next? Power over powerlines and internet over ethernet?!?

Re:Stop the craziness! (0)

Anonymous Coward | more than 9 years ago | (#11108423)

Sounds to me like somebody's trying to make a perpetual motion internet machine. If they do it with a computer, they might get a patent this time.

Re:Stop the craziness! (0)

Anonymous Coward | more than 9 years ago | (#11108566)

yea, kids these days, they have it all!

When I was your age, we didn't have power over ethernet, we banged flint rocks together to make fire, and send smoke signals, and we were glad!!

What Stops Someone from frying a network card? (0)

Anonymous Coward | more than 9 years ago | (#11108264)

Could a sloppy wiring job cause a fried ethernet card?

What about a device that provides a loop from the live pair to the data pair?

ac

the next USB (3, Insightful)

wattersa (629338) | more than 9 years ago | (#11108266)

I for one would like to have my ethernet hubs use the standard wiring for power rather than a brick and AC adapter that I have to find an outlet for. Since telephones already do this it's just the next step in the direction of USB everything. Which seems to be a good thing (tm). Now I know how to set up a LAN in an unwired munitions bunker...

I think you mean Firewire is the next USB (1)

2nd Post! (213333) | more than 9 years ago | (#11108440)

Since Firewire has support for:
IP for 1394
Power over Firewire
Mass storage

But at some point you have to hook up a wallwart to get power somewhere...

Re:I think you mean Firewire is the next USB (1)

bdcrazy (817679) | more than 9 years ago | (#11108597)

You could locate a power converter next to or near your servers and or your root hub. This would put it out of the way and eliminate the need of additional wall worts as long as you buy devices that can use this power.

the evolution of power over ethernet (1)

mmkkbb (816035) | more than 9 years ago | (#11108279)

Re:the evolution of power over ethernet (0)

Anonymous Coward | more than 9 years ago | (#11108557)



Dude, you spent way too much time on Google Image Search for that joke.

Razors!!! (1)

Clete2 (823221) | more than 9 years ago | (#11108287)

I want my networked razor and networked shaving cream!

The big question... (1)

FortKnox (169099) | more than 9 years ago | (#11108289)

...is, of course, does that mean I can install linux on my razor?!?!?

Re:The big question... (0)

Anonymous Coward | more than 9 years ago | (#11108421)

Cut your self shaving?

Yea... got root.

Re:The big question... (1)

ajax142 (69131) | more than 9 years ago | (#11108424)

No, but NetBSD seems to install fine!

Re:The big question... (1)

mi (197448) | more than 9 years ago | (#11108459)

does that mean I can install linux on my razor?!
You, probably, will soon be able to, but the project will never get beyond single-user booting.

Oh, and you'll need proprietory firmware for the blades.

13W could be dangerous... (4, Insightful)

Sheetrock (152993) | more than 9 years ago | (#11108294)

Depending on the voltage and amount of power involved.

There are a couple of drawbacks to this plan: first, the increased caution that will be necessary in working with network cable (everybody's used to them being safe as phone lines) and second the possibility of burning out devices that weren't built with this standard in mind. Who's to say that a cheapie network extender installed in a rat's nest of cabling five years ago wouldn't start a fire when you hook something like this up?

Re:13W could be dangerous... (1, Insightful)

MORTAR_COMBAT! (589963) | more than 9 years ago | (#11108385)

an excellent post. volts [computerhope.com] don't kill people, amperes [computerhope.com] do! and since watts [computerhope.com] are the product of voltage and amperage, and voltage will be likely low... this would lead me to believe that yes, these could be dangerous devices with a good amount of current going through... a physics professor of mine once said "it only takes a single amp to stop your heart"... oh yeah! now we can play flatliners without the need for a power outlet! sweet!

amperage and death (4, Funny)

MORTAR_COMBAT! (589963) | more than 9 years ago | (#11108447)

well this random post [madsci.org] seems to claim that 1 mA can kill a sick person, and 100 mA can kill a healthy person... so my "an amp can kill a person" should actually say "an amp could kill 1000 sick people... or 10 healthy people... or some combination thereof..."

Re:13W could be dangerous... (3, Informative)

Frennzy (730093) | more than 9 years ago | (#11108476)

UL considers the average human (for testing safety purposes) to be about 500 Ohms. Since most PoE is around 12v, you end up with about 24 milliamps across a 500 ohm load.

For that to have a severely negative effect, it would need to cross your heart. Most of the current will likely go around your skin (you are your own faraday cage) so you most likely would never even feel it.

Plus, you would have to actually come in contact with it...which is pretty easy to avoid.

Re:13W could be dangerous... (1)

imsabbel (611519) | more than 9 years ago | (#11108581)

Too bad you need a lot of volts to drive a lot of ampts through someones body, so you cant seperate them like that.
(just checked with my multimeter: my slightly sweaty hands have >5kohm from left hand to right hand even if i hold the contacts really tight. So 5V would give a milliamp, no matter if the source could deliver 50A...

Re:13W could be dangerous... (3, Informative)

YankeeInExile (577704) | more than 9 years ago | (#11108491)

Who's to say that a cheapie network extender installed in a rat's nest of cabling five years ago wouldn't start a fire when you hook something like this up?
How about the same UL (and their international equivalents) standards that already keep these same devices from catching fire if accidentally connected to telecoms lines.

Your assertion that ...used to them being safe as phone lines... begs the question*. Phone lines are not intrinsically safe, and the central office can easily provide several watts of power at 90VAC for ringers.

*Look, ma! Someone on slashdot who knows what 'begs the question' means!

In the US, at least, to meet Part 68, telephone gear must also handle line-crosses to 600Vac without creating a hazardous situation.

Re:13W could be dangerous... (5, Funny)

dourk (60585) | more than 9 years ago | (#11108516)

You may assume telephones are safe, but the have a ring votage over 40v. Wiring up a the last jack in my house, stripped one of the wires with my teeth just as my buddy called.

It fucking hurt.

Re:13W could be dangerous... (2, Insightful)

willpall (632050) | more than 9 years ago | (#11108585)

Actually, there's a constant DC voltage of ~48v (less by the time it gets to your house). The ring voltage is AC and closer to 100. Yes, it does fucking hurt.

Re:13W could be dangerous... (4, Funny)

shoppa (464619) | more than 9 years ago | (#11108603)

Dude, that's almost as funny as the guy who built a glass case around a 10K ohm resistor with a sign that reads "DANGER! 10000 ohms!"

Teledildonics baby (-1, Offtopic)

Anonymous Coward | more than 9 years ago | (#11108310)

I can see a 38W vibrating colon bruiser and a 1W cam on the end of it... Gay marriages are legal now in Canada, I can see selling a lot of these!

Already done before... (1)

xortw (767546) | more than 9 years ago | (#11108314)

etherkiller [fiftythree.org]

Re:Already done before... (0)

Anonymous Coward | more than 9 years ago | (#11108432)

goatse, get your goatse here...

Short circuit (5, Interesting)

totallygeek (263191) | more than 9 years ago | (#11108327)

I went to a company that cabled about 100 drops. When certain network items did not work properly, they tried everything to figure out what the problem was. Finally, one device was plugged in and did not work at all. It turns out that the cabling was wired with "just the same colors on one end as the other". The installers actually created an elaborate mapping on paper saying, wire 1: red, red/white, blue, blue/white, brown, brown/white, green/white, green. They would look up each cable on this run sheet before punching down the other end. The device that did not work evidently was not "looked up" correctly, and so there were no valid pairings. If this had been POE, something would have been fried.


Another company I worked with found out that their cable guys simply wired everything with 2 pairs only. They would punch down 1,2,3,6 and then cut the remaining wires completely. POE wouldn't work there either.


It is amazing how some companies attempt to save money by getting monkeys to install cables.

Re:Short circuit (3, Informative)

HaeMaker (221642) | more than 9 years ago | (#11108422)

Actually, the company who only wired two pair can get PoE for switches that provide PoE, but not external injectors. There are two standards for power, if the power is injected off the switch it uses dedicated pairs, if it is injected on the switch it uses the data pairs (phantom power).

Re:Short circuit (1)

Gadgetfreak (97865) | more than 9 years ago | (#11108531)

Just because someone doesn't do their job correctly doesn't mean it's a bad idea for info lines to carry power. Considering that all the wires in Cat5 equipment aren't always used, I don't see why a standard can't be developed. The basic phone line carries power all the time, and a ringing voltage spike.
I just got finished with the home inspector for my new place. We found 4 outlets wired with the hot/neutral reversed. They're outlets. Nothing new and confusing to anyone currently alive.

Anyone can make a mistake, but people need to learn to test things before they use them.

Heh. One way to check if a cable is still in use. (0)

Anonymous Coward | more than 9 years ago | (#11108332)

Or vice versa, a way to make your cable monkeys more careful about what cables they cut.

but.. (0)

Anonymous Coward | more than 9 years ago | (#11108336)

will it power my computer?

wifi? (0)

Anonymous Coward | more than 9 years ago | (#11108343)

What about a small PoE wifi AP? It could be short-range and low-power, just so that you could plug it into a nearby ethernet jack rather than running CAT5 to your laptop. Convienent.

DC power -- sad failure of standartization (3, Insightful)

mi (197448) | more than 9 years ago | (#11108346)

As much as the AC standard can be considered a success -- even if different regions use different voltage and connectors, the sorry state of the DC power is an outrage.

Why does every DC-using device come with its own adapter, and uses its own voltage? Why could not we standardize that?

Maybe, this "power over Ethernet" initiatives (together with the "power over USB") will spell the end of power-strips with curiously shaped "bricks" constantly falling out of them...

Re:DC power -- sad failure of standartization (1)

GlassUser (190787) | more than 9 years ago | (#11108414)

It's happening. Slowly. Somewhat. Even over the past few years, I've noticed things slowly gravitating to either 5v or 12v. I think part of this has to do with the 12v lines used by hard drives (eg the mini-itx market is pushing htis), and the 5v is used by a lot of chipsets, apparently (since every decent PDA seems to run off 5v). So we might get there eventually.

Personally I think it would be great if 12vdc was the "standard" dc power supply, and you can easily get or make an adapter to turn it into 5v.

Re:DC power -- sad failure of standartization (0, Redundant)

D0 J00 W4n7 K4r473 (841018) | more than 9 years ago | (#11108528)

I, for one, welcome our new power over ethernet overlords. I have such a tangle of power cords for everything in my office that one less cord for a few devices would be a welcome change.

That explains the RJ45 on my Braun (0)

Anonymous Coward | more than 9 years ago | (#11108348)

Well, no it doesn't really.

X10 camera (0)

Anonymous Coward | more than 9 years ago | (#11108364)

Didn't X10 cameras already do that? The transformer doubles as a networking device, allowing a central unit to control all cameras. Ok, so it's not the same as the ethernet, but this is kinda old already...

Work hazard (3, Funny)

Ceriel Nosforit (682174) | more than 9 years ago | (#11108372)

There goes the only type of devices I don't repeatedly electrocute myself on. =(
Damn you! Damn you to heck!

This is how the matrix gets started (1, Funny)

Anonymous Coward | more than 9 years ago | (#11108389)

Before long they'll be embedding an RJ45 jack in your skull and making you fatties hit the treadmill to power your own lan parties.

cool beans! (1)

blew_fantom (809889) | more than 9 years ago | (#11108390)

we're so behind in our infrastructure build-outs as compared to say, south korea, this would be a cost effective and perhaps efficient way to either retrofit buildings to be 'smart buildings' or to build new offices and buildings with such infrastructure. now, if they can only get PoE to my IP-based coffee maker and toaster, i'm all set.

Why I HATE You All! (-1, Troll)

Anonymous Coward | more than 9 years ago | (#11108399)

You think "users" are stupid? Fuck you all!

-NYT Reader

Re:Why I HATE You All! (1)

confusion (14388) | more than 9 years ago | (#11108477)

There are only 2 industries that call their customers "users". One is IT.

Jerry
http://www.syslog.org/ [syslog.org]

Re:Why I HATE You All! (1)

SpecBear (769433) | more than 9 years ago | (#11108577)

Yeah, and in every other industry we're called "consumers." What's your point?

We have one of these switches... (1)

Anonymous Struct (660658) | more than 9 years ago | (#11108441)

...but we just use it to set users on fire.

Great for wifi access points (2, Interesting)

Technonotice_Dom (686940) | more than 9 years ago | (#11108465)

I've seen this implemented in a local school (in the UK) that issues all staff with laptops. The laptops then have a student register application running on them, and the staff can wander across the building using it. They've put up lots of D-Link access points scattered all over their buildings, just mounted to the wall on wooden boards - an ethernet cable appears out of the wall, or from a socket, into a little box (size of PCMCIA card, but thicker) which then has two cables (power + ethernet) going into the access point.

Appears to work very well for them.

39W, Bah! (1)

VernonNemitz (581327) | more than 9 years ago | (#11108471)

You can trickle-charge your electric car on only 13W, if you are willing to wait long enough!

This just in...new energy source (0)

Anonymous Coward | more than 9 years ago | (#11108484)

to be developed DOE research program. Bush administration heard "there was unused wires in the ethernets". Goverment spokesperson from DOE: "The problem of where to get the energy that will make the hydrogen ecomony work is one of the president's top priorities. We have been directed to develop new technology that can split water into hydrogen and oxygen using low amp 48v DC power. Such DC power sources are all around us and we just haven't been using them."
Reporters have obtained documents showing there is already one research grant proposal from a group of scientists who used to work for Enron.

I know its a troll but you just never know what a /. story will bring to mind!

real world problem (0)

Anonymous Coward | more than 9 years ago | (#11108494)

...but the demo shows how creative, out-of-the box thinking can solve some real problems for our industry.

is the funnies part for a LAN connected razor

encrypted bidirectional RFID and physical access? (1)

neonman (544) | more than 9 years ago | (#11108505)

I'd love to see PoE used for encrypted bidirectional RFID readers and physical (door) access control. Each door would require only one UTP cable, providing power for both the reader and the door strike. I'm not sure how this would apply to magnetic locks.

The less parallel wiring a building needs the better.

Such a product would also enable the battery backup of an entire building's access control system - a single UPS for the ethernet switches.

Networked sex toys? (0)

Anonymous Coward | more than 9 years ago | (#11108518)

The whole battery thing was always a drag.

POE changes everything.

When will I need to hire an electrician? (1)

Shishak (12540) | more than 9 years ago | (#11108522)

To install my Network cable because it all has to be properly installed/grounded etc. now that it is carrying electricity?

The electrical union must LOVE PoE they have been trying to get state electrical code written to include low voltage wiring for years, maybe PoE will be enough to get it changed :/

39W no use for Prescotts (1)

kompiluj (677438) | more than 9 years ago | (#11108524)

For my brand new Prescott based computer I need at least 390W :)

internet radio? (1)

the_2nd_coming (444906) | more than 9 years ago | (#11108530)

this could be cool for an internet radio appliance or many other small single use internet appliances.

I'm waiting for the opposite (1)

Z00L00K (682162) | more than 9 years ago | (#11108532)

What I would like to see is LAN over Power, which would bean that I could monitor the coffee machine from a distance without extra cabling.

My toaster (0)

Anonymous Coward | more than 9 years ago | (#11108559)

I want enough power to run my linux toaster.

obvious extension (1)

room101 (236520) | more than 9 years ago | (#11108562)

Can't wait until power over wireless connections become available.

then you'll really have something.

What about 1 gig ethernet and 10g? (0)

Anonymous Coward | more than 9 years ago | (#11108574)

1 gig and 10gig (2007) both use all 4 twisted pairs. How do they expect to power the devices of the future?

Re:What about 1 gig ethernet and 10g? (0)

Anonymous Coward | more than 9 years ago | (#11108606)

POE can use either the used pairs or unused pairs. IE -you don't need to have free pairs to carry power.

I'd also like to point out that there is no such thing as an ethernet cable. Ethernet is an OSI Layer 2 protocol. Category x cable is the correct terminology.

What... (2, Funny)

fizban (58094) | more than 9 years ago | (#11108583)

...is the world coming to?

Power over ethernet! Internet over power lines! Human sacrifice! Dogs and cats, living together! Mass Hysteria, people!

Mayhem and chaos! (1)

DaveJ2001 (559498) | more than 9 years ago | (#11108586)

Power over ethernet? Bah! Here's a few more uses [fiftythree.org] for power over anything!

Ethernet Enabled Electric Razors? (4, Funny)

Tezkah (771144) | more than 9 years ago | (#11108591)

I'd really like to see an electric razor that had a version of Windows on it. You'd be shaving your face, and then a holographic Clippy would pop up: "It looks like you're shaving your face, would you like tips on shaving your junk?"

I'm pretty sure that should be the prompt he'd give you no matter what you're shaving. "It looks like you're shaving your head, would you like tips on shaving your junk?"

Someone has to say it. (1)

mad.frog (525085) | more than 9 years ago | (#11108596)

Imagine a Beowulf cluster of electric razors...
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