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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 9 Oct 2018
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      Why is it that every time something like this happens nobody has any hard documentation or analysis results? Ah yes, the best cop-out. "We don't have it any more, we can't give you more details".pic.twitter.com/EooD0aIVyR

      4 replies 11 retweets 47 likes
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    2. Hector Martin‏ @marcan42 9 Oct 2018
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      So now we have *software* detecting *analog* stuff like the "power consumption" of a *network*. None of those words go together. At all.pic.twitter.com/h0W0R8cI7L

      6 replies 7 retweets 71 likes
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    3. Hector Martin‏ @marcan42 9 Oct 2018
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      Basically every Ethernet jack I've seen in anything but cheapo consumer routers/switches has been metal. How the hell is this an IOC?pic.twitter.com/1LG7tBe9MW

      4 replies 14 retweets 60 likes
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    4. Hector Martin‏ @marcan42 9 Oct 2018
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      Nevermind that... Ethernet jacks don't have power pins. Where is this module (that uses so much power that it gets hot) magically powering itself from? Nobody runs PoE out to servers. Did they modify the board design to add power pins too?

      6 replies 12 retweets 81 likes
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    5. Daniel Cincunegui  🧢‏ @danielcincu 9 Oct 2018
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      Replying to @marcan42

      Minor nit: power is available for the jack itself since it typically has two LEDs. So if you modified a jack previous to board mounting, you have power. Not enough to need heat dissipation, but enough to run a small chip.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @danielcincu

      Not a small chip able to MITM 1000BASE-T. You aren't going to get more than 60mW from an LED.

      2 replies 0 retweets 1 like
    7. Daniel Cincunegui  🧢‏ @danielcincu 9 Oct 2018
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      Replying to @marcan42

      You don't get the power from the led, you draw power from its supply. It only needs to run the logic. You would get further intermitent power from the jack pins. Not backing the Bloomberg piece, just saying it's possible.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @danielcincu

      I'm talking about the LED supply. 20mA at 3V is the max any indicator LED will be powered at (a lot less these days). LEDs are current limited, so you don't get to draw more. That's 60mW. So no, not possible. Not going to draw any significant power off of the Ethernet pins either

      1 reply 0 retweets 0 likes
    9. Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @marcan42 @danielcincu

      *Maybe* if the LEDs are low side switched *and* the current limiting resistor is on the low side and you wire up yourself between anode and the connector shield you could steal more power, but that's a lot of maybes and assumptions about the board design.

      2 replies 0 retweets 0 likes
    10. Daniel Cincunegui  🧢‏ @danielcincu 9 Oct 2018
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      Replying to @marcan42

      Fine. I am not claiming it was done. I am saying there is a possible approach and that you forgot that the part pinout is not the same as the jack pinout.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @danielcincu

      Ethernet jacks still don't have power pins. LEDs pins are not power pins. You're not the first to bring up this idea of powering an implant off of the LED supply. It's not practical, I already considered it before your tweet.

      12:17 PM - 9 Oct 2018
      1 reply 0 retweets 0 likes
        1. Daniel Cincunegui  🧢‏ @danielcincu 9 Oct 2018
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          Replying to @marcan42

          Hmm... OK, I don't understand why though. If you have an eight port part, you have using your figure 60 x 8 mW, so 480 mW. 16 ports, 960 mW. You have plenty of room as well. So where is the blocker?

          0 replies 0 retweets 0 likes
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