Hi
I got the same problem.
Here my setup:
TS-7250 and TS-7260
TS-ENC720 Enclosure Power supply and regulator
Regulated 5V 3A power supply,
HE104, 50 Watt regulated power supply (good quality, 350$ a unit)
TS-MODEM2 with Multitech MTSMC-G-F2 GPRS modem
TS-GSM1 Modem.
So I tried every combination possible of arm, modem and power supply
and I always got the reboot problem.
It Look like the GSM modem create current peak when transmitting, and
the TS-72XX does not appreciate that.
I also tried to put caps on parallel of the power supply near the
power plug of the TS-72XX board but without success.
Anyway, from my many hours of testing, I found that:
1. The problem only happen when the modem is transmitting
2. With the TS-7260, its really worst with the switcher enable
3. Using a really strong power supply reduce the risk to have the problem.
Nevertheless I was never able to completely eliminate the reboot problem.
Right now I think I will use the Multitech modem alone with it own
power source, since he doesn't reset himself!
Sincerely
Etienne
--- In "naturalwatt" <> wrote:
>
> I have now finally got an aerial connection to my GSM modem, and it
seems that the
> transmission causes the 7260 to reset - about every 20 seconds!
>
> Setup: 7260, Modem-2 daughterboard, Multitech GSM/GPRS socket modem,
> 900/1800MHz.
>
> With the SIM inserted and an aerial plugged in, the 7260 resets
itself about every 20
> seconds. There is nothing logged to the console on /dev/ttyAM0
apart from the startup
> messages.
>
> If I unplug the aerial OR remove the SIM it doesn't happen. It
can't be a software problem
> as the modem is simply seen as a serial device, /dev/tts/3. There's
no software running
> that interacts with the serial port when it resets.
>
> I have another system, a 7250, plugged into the same 12V power
supply which runs
> perfectly, so it's not off-board power supply. The voltage at the
power pin to the modem
> is 5.00 V, so it's probably not on board power sagging too low.
>
> Interestingly, although it's a 5V modem, I initially plugged it in
at 3.3V, and it seemed to
> work except it could not access the SIM.
>
> I am suspecting the radio transmision is causing the CPU to reset,
but I don't know what to
> do about it.
>
> This 7260 is not in its enclosure, but sitting bare on the bench.
However, the 7250 is
> about the same distance from the aerial and is not affected. Putting
the 7260 into its
> enclosure does not change things; it still resets and the 7250 (not
enclosed) doesn't.
>
> I assume *someone* has used a GSM modem with a 7250/7260 before?
>
> Martin
>
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