How to debug USB hardware issues

[Alberto Mijares]

Hi,

I have a SMS gateway with FreeBSD 8.2 RELEASE on old hardware
(Pentium4). It has plugged a modem  Enfora SA-EL, GSM-GPRS, via USB.

The modem has been working fine for years. However, since it's plugged
to this server, the application that manage the modem hangs every one
or two days.

I'd like to know if there is a way to know exactly if the problem is
the USB ports or the modem failing (because has some years now). Some
time I have to reset the USB port (using usbconfig) and it works
again. Tha bad thing is that the application hangs and cannot reset
the modem (using the %RESET AT command).

Thanks in advance for your suggestions.

Regards


Alberto Mijares