×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

PoE splitter/extender/injector to supply with 5V and pass-through data and PoE

PoE splitter/extender/injector to supply with 5V and pass-through data and PoE

PoE splitter/extender/injector to supply with 5V and pass-through data and PoE

(OP)
Hi has anyone know a cheap solution how to power a device with 5V or 3.3V (approx. 2-3 Watts) and pass-through data and PoE to the IP camera. Please see scheme attached. Answers would be much appreciated.

Thank you.

Sincerely,
Vilius

RE: PoE splitter/extender/injector to supply with 5V and pass-through data and PoE

The most obvious solution is to upgrade the switch so it supports PoE, although that won't give you the +5V, which I'm assuming you need for the device indicated. Ubiquiti has PoE injectors capable of providing the function of a PoE switch, but still won't get you the +5V, although they don't require you replacing the whole switch.

Probably not that helpful, but Raspberry Pi is developing an add on board that will do what you're after, but its obviously designed for integration with the Raspberry Pi, and its not released to market yet. PoE is, as far as I'm aware, 48V, so its not so likely that you'll find a device that drops it to 5V for connection to an external device, particularly when you already need to connect ethernet to the device anyway. Having said that, there might well be other devices like the Pi unit.

EDMS Australia

RE: PoE splitter/extender/injector to supply with 5V and pass-through data and PoE

How many PoE ports do you need? This Gigabit switch has 5 ports, 4 are active PoE ports for under $50.
https://www.amazon.com/TP-Link-TL-SG1005P-Gigabit-...
If your cameras support passive PoE you could go with an injector like this one, power supply not included:
https://www.amazon.com/WS-POE-8-ENC-Injector-Ether...

By the way, PoE is supposed to be 44v to 57v dc. Don't attempt to feed any other voltage directly into the RJ45 PoE port of a device.

If you are not really using it for the PoE standard you could use something like this. You could inject any voltage you want at one end and remove it at the other end. Again, you will need to provide a separate power supply.
https://www.cctvcamerapros.com/ProductDetails.asp?...



RE: PoE splitter/extender/injector to supply with 5V and pass-through data and PoE

(OP)
Hmmm... Maybe you have any suggestions how to power up the Device in scheme while passing-through data and power to the IP camera?

Thanks

RE: PoE splitter/extender/injector to supply with 5V and pass-through data and PoE

What's the device?
How far away is it from the Camera?
Does it also use ethernet, or are you just attempting to use the PoE as a pseudo power supply because its near the camera? I'm assuming the camera is PoE compatible?

EDMS Australia

RE: PoE splitter/extender/injector to supply with 5V and pass-through data and PoE

If you provide the model number of the camera we could probably give you a good idea of what you need.
With standard 10/100mbit ethernet POE, the DC is sent over the 2 unused pairs in the cat5 cat6 cable. Gigabit ethernet requires all 4 pairs and a different scheme is required for PoE. Gigabit PoE devices are harder to find and cost much more.

Image from https://en.wikipedia.org/wiki/Power_over_Ethernet

RE: PoE splitter/extender/injector to supply with 5V and pass-through data and PoE

Can you provide the model number or a link to the camera? The image you supplied doesn't give any details on what voltage needs to be supplied to the "Mounted device", whatever that is.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources