What is PoE? My tough PoE development process

I had time to learn and develop PoE.
It's a lot more interesting than I thought. Please come in

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Do you know about PoE? It's a tremendous technology that can send power to Ethernet.
I've studied this technology and made modules it module.

This is my PoE module development process.
PoE development process for Wiznet Ethernet Chip.

There are all the data and experiments in the log. Look at the Log!

I'm a developer of Wiznet, and I am studying and experimenting with hardware a lot.

This project is for Wiznet Chip.

Materials related to Wiznet are available on the following site.

Adobe Portable Document Format - 112.97 kB - 12/07/2022 at 23:33


  • W5100S-PoE-Pico

    Alan12/20/2022 at 07:00 0 comments

    I was busy assembling and experimenting, so I'm uploading it now.

    The board arrives and quickly assembles and posts.

    I thought it would be mounted like this, but I ended up mounting it up. Of course, you have to use a slightly peculiarly long header socket.

    Assembled top and bottom sections are like this.

    48V is a little noisy, but it's okay.

    5V is coming out really well done

    The 3.3V also comes out very neatly.

    I'm going to turn the Aging now. A slight "ringing" appears on the trans. So I'm afraid the devices will be broken.

    It is now necessary to lower the unit price of the parts and improve the board. Also, I'm thinking about how to develop more.

    I'll cover those in the next post. Please pay attention to it'!

  • W5100S-PoE-Pico-EVB Development

    Alan12/15/2022 at 00:40 0 comments

    Thank you for your great interest. I'm so excited that I'm posting it fast and diligently.

    Anyway, I'm going to make a better PoE module that can be attached to the Pico board and used Pico board.

    Here's the circuit configuration.

    In fact, nothing much has changed.
    I wanted to change the switching element, but I decided to change it after completely controlling it.

    Many Capacitors have been added to the output terminal. Most of them are NCs, but they will be installed as needed.

    The artwork has been completed.

    Wow, the space is really...It's really, really narrow. The picture doesn't look like it, but the actual board itself was very small, so it was very difficult to arrange the parts.

    And it's isolated, so I have to distinguish GND, but I thought I had a cramp in my head because I was thinking about this part.

    In the end, the artwork was completed somehow and placed an order.

    When assembled, it will probably be completed in this way.

    It will look like this if you attach it to the Pico board...? It feels awkward because the length is different.

    Next, I will assemble the board and post it as a test result

  • 7W ModeB Aging

    Alan12/12/2022 at 00:01 0 comments


    This time, I tried Aging in Mode B under the same experimental conditions as in the last log.This switching hub supports only Mode B. And unfortunately, the maximum spec is 7W, so I tested up to 7W.

    As a natural result, Mode B also has no problem.

  • 8W ModeA Aging

    Alan12/11/2022 at 23:32 0 comments

    Agging in 8W environment.The board on which the module is installed is the W5100S-Mining board mentioned in the previous Log. This board consumes a total of 3W.

    The board on which the module is installed is the W5100S-Mining board mentioned in the previous Log. This board consumes a total of 3W. And the board with LED Fan is DC Loader. I set it to consume 5W.
    I'm consuming 8W in total.

    <DC Loader: I bought a simple kit and I'm using it with great satisfaction. Recommend.>

    We did Aging for 2 nights and 3 days.
    I checked the status with the USB to Serial module because there was a problem with the power supply and it could be down.

    There was no problem with the test.

    I thought a lot of heat would occur, but it didn't occur at all.

    It seems to work well up to 8W.

  • Explanation of PoE and Development of Modules

    Alan12/07/2022 at 23:54 0 comments

    POE(Power Over Ethernet)

    • It refers to power transmission technology itself, and its components are divided into PSE and PD.
    • It is a technology that can transmit power and data to devices over Ethernet using Cat 5 twisted-pair cables.
    • It can operate without having to change the Ethernet cable structure, saving time and money for cable configuration.
    • It has remote power on/off, short circuit protection, over-voltage/low voltage protection, and over-current protection

    The PoE international standard is divided into IEEE 802.3af/802.3at/802.3bt. As shown below, it is divided into four types depending on the amount of power, and you can select and use it according to the application you use.

    PSE(Power Sourcing Equipment)

    • Power the Ethernet cable and manage the power.

    It is divided into two types, Endspan and Midspan, depending on the power transmission method. There are usually many PSE devices that support only one, and there are few PSEs that support both, but the price is high.

    Endspan PSE (Mode A)

    • It is a method of delivering electricity through a data line. Power is transmitted to CT of PSE and received to CT of PD.
    • As a disadvantage, the implementation is relatively complicated, and since power is supplied to the data line, it may be vulnerable to power noise.
    • The advantage is that it can also be used at 1000 Mbit, and it can be combined with Mode B to satisfy higher power transmission specifications.

    Endspan PSE (Mode A)

    Endspan PSE (Mode A)

    Midspan PSE (Mode B)

    • Since only two pairs (1, 2/3, 6) are used for data transmission in the 802.3af standard, it is a method of transmitting power through wires 4, 5/7, 8 that are not used for data transmission.
    • It is typically used on 10/100 Mbps equipment that supports only the 802.3af standard.
    • Simple to implement, low cost.
    • There is stability

    Midspan PSE (Mode B)

    Midspan PSE (Mode B)

    Endspan vs Midspan Since the lines used are different, cables are also divided.It is divided into T568A and T568B.

     VERSA Technology

                                                                                  <VERSA Technology>


    It is a device that receives power and uses it. Examples include IP phones, IP cameras, and PDAs.

    It is now the beginning of full-fledged development.

    The goal

    The goal is to create a PD module that is compatible with both Mode A and Mode B. PD needs to receive about 48V from PSE and produce an output voltage of 5V. However, the PSE does not vaguely output 48V. PSE sends out the output through its own process.

    PoE Process

     AAEON Forum

                                                                                      <AAEON Forum>

    1. Detection Period

    The PSE equipment outputs a very small voltage from the terminal until it detects that a PD supporting the IEEE 802.3af standard is connected to the end of the cable.

     AAEON Forum

                                                                                      <AAEON Forum>

    Continue to release 2.8V and 10V at 500ms intervals (until PD is detected). Then, the resistance value of PD is measured by calculating the current. When the resistance value falls within the category of about 25k, it moves on to the next step.

    2. Classification Period

    When a PD is detected, the PSE evaluates and classifies how much power the PD consumes.

    3. Start-up Period

    The voltage rises to 44-57 V in less than about 15 us.

    4. Operation Period

    It is a stable period of...

    Read more »

View all 5 project logs

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kylewatson wrote 12/21/2022 at 06:15 point

You're very capable. Did you finish this high-quality circuit design and artwork by yourself?

It would be great if it could be a movement.I respect you

  Are you sure? yes | no

Alan wrote 12/21/2022 at 07:40 point

Thanks : )

  Are you sure? yes | no

kylewatson wrote 12/21/2022 at 06:13 point


  Are you sure? yes | no

jiondene537 wrote 12/20/2022 at 11:02 point

Another important topic to discuss is that of Feature Creep. This is when the featureset of a piece of software gradually increases over time as developers think of more cool stuff to add, eventually causing production problems.

I work in software and know how it goes.

The players have been asking for QoL improvements for a long time, a lot of those requests involve removing content. Some examples are; tormented spirits, talismen, dark shrines, dead skills like conversion trap, etc.

Not only does this add a lot of overhead and tech debt to the product, but it also makes the UX a whole lot worse, particularly for new players.

Will we ever see a clean up of these sorts of things, or is it not worth the effort as POE2 is on the horizon?

  Are you sure? yes | no

alethebat8640 wrote 12/18/2022 at 15:29 point

It was not fan cooler. .

  Are you sure? yes | no

Alan wrote 12/19/2022 at 01:51 point

Are you talking about the FAN of DC Loader? Heat sink and FAN to prevent the switching IC from getting hot when the load is applied.

  Are you sure? yes | no

alethebat8640 wrote 12/15/2022 at 11:43 point

how used liquid cooler on smartphone once without pc anymore. Tips me in PM.

  Are you sure? yes | no

Alan wrote 12/18/2022 at 10:03 point

I'm sorry, but I don't know what the liquid cooler you're talking about. Can you say that again?

  Are you sure? yes | no

alethebat8640 wrote 12/18/2022 at 15:29 point

Mean tube cooler for RAM storage I mean it,if its work to modified it. Isnt it right. Wasnt found how to fixed pc part hardware and phone parts hardware to convert each supports.

  Are you sure? yes | no

Alan wrote 12/19/2022 at 01:49 point

I'm sorry...I don't understand.

  Are you sure? yes | no

Apuuuuucha wrote 12/15/2022 at 05:14 point

You didn't change the IC This is a bit disappointing.

  Are you sure? yes | no

Alan wrote 12/15/2022 at 07:09 point

I tried to use a smaller, cheaper IC. However, first of all, it will be revised step by step if it becomes clear with the current IC. I'll change it eventually, so please look forward to the next post

  Are you sure? yes | no

Apuuuuucha wrote 12/15/2022 at 05:13 point

If your little Pico board works reliably, I think it's really great.However, the probability of working well is low. You know, there's a really high probability that insulation won't go well, and the more power you get, the more problems you'll have. But I really admire this attempt.

  Are you sure? yes | no

Alan wrote 12/15/2022 at 07:12 point

I think so, too. It will be a really good module if it works stably. But there are a lot of big problems. Especially the isolation problem. But if you keep going, you'll eventually get it done. Please look forward to it.

  Are you sure? yes | no

kylewatson wrote 12/12/2022 at 23:23 point

Good project ! I have a question. Are you planning to make and sell this module?

  Are you sure? yes | no

Alan wrote 12/13/2022 at 01:57 point

Well, unfortunately, it's not planned yet.

  Are you sure? yes | no

Apuuuuucha wrote 12/08/2022 at 00:26 point

How many watts does the power supply output?

  Are you sure? yes | no

Alan wrote 12/08/2022 at 00:28 point

I checked the normal operation up to 5W.

  Are you sure? yes | no

Apuuuuucha wrote 12/12/2022 at 23:17 point

You added a Log. Is it up to 8W?

  Are you sure? yes | no

Alan wrote 12/14/2022 at 13:42 point

The 8W works. However, it is still unstable, and the input capacitor gets very hot.

  Are you sure? yes | no

Apuuuuucha wrote 12/14/2022 at 13:45 point

Can you tell me what the switching IC you used? I think I can be of help.

  Are you sure? yes | no

Alan wrote 12/14/2022 at 13:47 point

It's the DPA series. However, I am thinking of switching to a simpler switching IC in the new module.

  Are you sure? yes | no

Apuuuuucha wrote 12/14/2022 at 13:50 point

Are you planning to post that module soon, too?

  Are you sure? yes | no

Alan wrote 12/15/2022 at 00:13 point

Of course!

  Are you sure? yes | no

Alan wrote 12/08/2022 at 00:17 point

If you have any knowledge of PoE, please leave a lot of comments.

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