[Soekris] spontaneous reboot with large packet flows on net5501+lan1741

Nix nix at esperi.org.uk
Tue Feb 17 20:27:53 CET 2015


On 17 Feb 2015, Andrew Atrens told this:

> Hi Nix,
>
> It's almost certainly a power issue as power draw for the lan card
> will not be a static thing - ie will increase when transmitting
> packets vs idle.

Yes, only I'd expect the increase in power draw to be the same when the
built-in ports fire up, and *those* work fine. Does the LAN card draw
more power than the built-in ports for a given amount of work, or
something?

> Best case is that you have access to a DC-regulated power supply, perhaps one of these -
>
> http://www.bkprecision.com/products/power-supplies/1670A-triple-output-30v-3a-digital-display-dc-power-supply.html

Boggle. No, I have nothing like that :)

> and can monitor the current draw as you bring up the board and test ..

I do have one of those socket adaptors with an LCD display that shows
you current draw, etc, but it only gives instantaneous figures, and of
course it sits between the adaptor and the wall, on the wrong side...

> If the setup is stable on this power source, you can watch how much
> current the 5501 is drawing and from that figure out how much punch
> you'll need in a static power source.

I'm quite happy to simply upgrade to a better adaptor than the
Soekris-EU-supplied wall-wart -- but I have no idea what might
constitute 'better' in this case: I am not by any stretch of the
imagination an electrical engineer[1], and mostly treat power supplies
as magic boxes that make things work :P


[1] well, I'm good at killing things with static shocks, but that makes
    me an electrified engineer, I think...

-- 
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