Author Topic: Where to find PoE (RJ45) Module or schematic to build one  (Read 257 times)

0 Members and 1 Guest are viewing this topic.

Offline Signal32

  • Regular Contributor
  • *
  • Posts: 240
  • Country: us
Where to find PoE (RJ45) Module or schematic to build one
« on: April 12, 2021, 02:26:04 pm »
Hello,

I'm interested in getting power via Ethernet cable. There is a standard that supports this: https://en.wikipedia.org/wiki/Power_over_Ethernet
However power is not sent via ethernet by default, a module needs to communicate with the PoE switch and request power.
My question: Are there such ready-build modules that just do the communication with the switch and request power to be sent ? Or can I find a schematic for one ?

I found this on eBay but it also has a 12v transformer built which makes it much larger than necessary and which I don't need. Anyone know of a bear-bones module that outputs 48v or a schematic for one ?

Thanks!
 

Offline bingo600

  • Super Contributor
  • ***
  • Posts: 1562
  • Country: dk
 

Offline Signal32

  • Regular Contributor
  • *
  • Posts: 240
  • Country: us
Re: Where to find PoE (RJ45) Module or schematic to build one
« Reply #2 on: April 12, 2021, 04:03:42 pm »
@bingo600, yes, that's what I was looking for, though the module is kind of large probably due to having to deliver 15W. How can I find a schematic for this - I only need ~3W and would rather build a smaller one myself.
 

Online kripton2035

  • Super Contributor
  • ***
  • Posts: 2064
  • Country: fr
    • kripton2035 schematics repository
Re: Where to find PoE (RJ45) Module or schematic to build one
« Reply #3 on: April 12, 2021, 04:04:47 pm »
see attached pdf
 

Offline Syntax Error

  • Frequent Contributor
  • **
  • Posts: 584
  • Country: gb
Re: Where to find PoE (RJ45) Module or schematic to build one
« Reply #4 on: April 12, 2021, 04:06:43 pm »
I've used these TPLink injector/splitter combinations without issue. The injector sends 48 volts and the splitter outputs at 12/9/5 volts, suitable for IP cameras, phones, etc.  They are available as seperates.
https://www.tp-link.com/uk/business-networking/accessory/tl-poe200/

Otherwise, a used managed PoE switch can be found on ebay for around $20. Just be sure it still has it's PoE rated power brick.
 

Offline Signal32

  • Regular Contributor
  • *
  • Posts: 240
  • Country: us
Re: Where to find PoE (RJ45) Module or schematic to build one
« Reply #5 on: April 12, 2021, 07:36:07 pm »
Thanks, the LAN8710A from @kripton2035 schematic was what I was looking for.
 

Offline westfw

  • Super Contributor
  • ***
  • Posts: 3418
  • Country: us
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf