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Re: [lwip-users] hayes commands popping up in ppp stream

From: Sylvain Rochet
Subject: Re: [lwip-users] hayes commands popping up in ppp stream
Date: Fri, 14 Nov 2014 21:42:55 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

Hi chrysn,

On Fri, Nov 14, 2014 at 05:43:47PM +0100, chrysn wrote:
> i was afraid so when i first saw them, but i never ran into an
> UNDER-VOLTAGE POWER DOWN condition so far; thing is, i'm running my
> entire board off 3.3V, which is the threshold for the warning. the
> module can do down to 3.2V, and a 2m2 cap in parallel with a 4u7 and
> 100n make sure it won't even if the usb power supply doesn't handle
> bursts well.
> i hope it's sufficient -- or are you confident that this is indication
> of trouble even when running on 3v3?

GSM modems connected to anything else than a li-ion battery should 
really be powered with a 3.8V 2A-peak low ripple power supply with 
enough decoupling capacitors (300 µF at least if powered through a DC/DC 
converter) for them to work correctly.


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