#276 Power over Ethernet (PoE) Tutorial

Our connected devices usually have two connections: One for data and the other for power. If we use an Ethernet cable, we can combine data and power on the same cable. Very convenient. Do you know how this “Power over Ethernet” or PoE works and what we have to do to take advantage? Let’s have a closer look.

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[AndreasSpiess]

Addendum:
Of course, all said here applies also for Cat6 or Cat7 Ethernet cables. It might be even better to use those cables if you do permanent cabling in your house because they will also work with faster Ethernet standards.
I used the term "patch cable" misleading. I should have said: Crossover patch cables.
And finally: There is nothing like "Power over Internet". Maybe it was a Freudian slip?

[uedsoldier]

Your channel is pure gold! Thank you for making these topics far easier to everyone.
Greetings from Mexico!

[bryngerard]

I would definitely deploy at least Cat6. There are also 'smarter' splitters available that use the full standards and the output voltage can be selected (5v, 9v, 12v). TPlink do one but it is rather expensive but works well. POE has been my preferred method of getting power to devices for some years now.

[TAZIT]

Крайне полезное, интересное и полезное видео на тему РоЕ питания ... !
Огромное спасибо автору за весьма огромный труд и огромная благодарность за то те кто его смотрит могут намного больше времени потратить на нечто иное, чем пытаться найти информацию по теме ... !

[Bob]

This reminded me when I worked for a company that relied on telephone lines for data (regular old POTS and ISDN) we used to joke anytime we had problems we should use an RJ11 to 110v adapter (telephone to electrical socket). Fortunately back then, the phone companies were quite helpful and put customer service on top. It helped that we spent 10's of thousands of dollars every month on line installations and phone service every month. We also used, similar to PoE, power over Cat 4 to our remote data terminals that communicated over POTs (regular phone) lines.

[Mensan]

I am impressed that you use Mikrotik. Here in the US I have over a hundred deployed in the field and most tech's have never heard of them. I've been using for almost 20 years. I know they are much bigger in Europe.

[lelandclayton]

A Side is used for Residential and B Side for UL.



Take it from a Professional Home AV Integrator and if you're having a Home built or renovated I would invest in Cat6A cable. Plain old Cat6 has the same specs for Cat5e except less cross talk and uses a thicker wire gauge. Cat7 is Cat5e but Shielded. Cat6A can handle up to 10Gbps. Since Category Cable is so versatile you can use it for HDMI Video/Audio Transmission, Analog CCTV, IP CCTV, Home Automation, Security Systems, even Central Vac Systems. However I wouldn't waste my money on Cat6A Security (unless you're using a smart Keypad) and Central Vac.
While I am here go with this tid-bit. Never put all of your cable drops into one of those dorky Structured Panels, no matter what size panel you use in the end you'll wish it was bigger and put the Cable drops in a ventilated Closet that has Attic access above. If you can't put it in a area that has Attic access then have a conduit ran from that point to the Attic.

[avejst]

Nice walkthrough as always
Fantastic work Andreas!
Thanks for sharing👍😀

[structure]

Great informative video... I like your content that isn't always how to make something, but related topics like POE. A year ago I was trying to create a device charger using POE but it was coming from a high end Meraki switch. Now I understand why it didn't want to work! Thanks!

[hjboven]

Getting the old cabling exchanged for cat 6 was the best upgrade to my house. Like your videos very much keep up the good work. Regards from Murten

[apulanto]

Ich dachte immer ich weiß schon alles über POE. Danke für ein wie immer tolles Video. Alles auf den Punkt gebracht. Mach weiter so. Einer meiner Top10 Kanäle :)

[johnbondza]

Swiss watches and clocks - high precision and accurately made. Some shafts have jewel bearings
Swiss chocolate - rich flavour and addictive. Well packed but easy to open
Swiss Red Cross - known round the world for their work. Very reliable

The guy with the Swiss accent - all of the above. He also has a great Germans dry sense of humour. Thanks for all your great videos.

[GeorgeWMays]

Gigabit Ethernet requires CAT-5E or better. Many prefer CAT-6, though the velocity of propogation is, I believer, slower than CAT-5E. I don't know about customs in the EU, but in the US almost all pinouts are done in accordance with the T568B standard.

[DrorF]

This was very helpful for me! I don't have devices that use PoE, but I want to route ethernet cables to all the rooms in my house. I considered buying PoE hardware, but I didn't know how I should do it (if at all). The routers and switches seemed too expensive for me, and there were several factors to consider: active, passive, power capacity, using injectors (instead of PoE router), etc. Your video made an order in all that. Now I know how PoE works, what modes there are, what are the hardware options, and how to make it all work together. Now I can make a more educated decision and plan better. Thank you.

[joelk]

Hello Andreas - excellent presentation, concise, informative, and very useful. I am getting started in POE and now know what's going on so I can select my equipment with confidence. Thanks for the great work, and keep it up!

[JustinDrentlaw]

Great video mate! I learned a lot of new things about PoE. You just earned yourself a new subscriber! Cheers from SoCal :)

[Infrared]

I had an old trick I used for crossover cables going back years. I would take a sharpie and colour in the sides of the crossover cables. Black, red, blue, didn't matter. If the ends were coloured on the sides, it was a crossover cable. I've still got a couple floating around and it has held up really well.

That said, I'm really happy that unless you are playing with some really old switches (or hubs) it hasn't been needed in a long time.

[anthonvanderneut]

There is a relatively cheap Netgear 5 port switch which is PD *and* PSE, powering two of its ports (the other two are data only). It was an easy way to extend the number of ports from one to four, when I couldn't easily pull multiple cables.
(Netgear GS105PE – 5-Port Gigabit ProSAFE Plus Switch with PoE Pass Through)

[ariedemuijnck]

A good story, but I'm missing a big WARNING about using the injectors like the one shown at 12:48. That is a simple 48V supply. Connecting it to older, non-PoE prepared loads, will blow the usual 75 Ohm "Bob Smit termination" resistors in the RJ45 inside the powered device. The escaping magic smoke may bother some users...

[darkknight]

As always, this is a very informative video :) Easy to understand for people who do not know anything about Ethernet, and not too slow for people who do :)

I already knew how Ethernet works and I cannot remember how many Ethernet plugs I crimped, but I did not know how PoE works. I plan to install some PoE enabled cameras around the house, but now I know that I cannot just plug in a PoE injector somewhere without potentially breaking some existing devices. Well, that is good to know!

Thanks for this video!