http://kerneltrap.org/mailarchive/linux-usb/2010/2/19/6257991
I'm doing some reliability testing to see what happens to the device if it loses service. With a connection up, I place the device inside a metal enclosure to simulate the loss of network connectivity. The device behaves as I would expect for the first ten to fifteen minutes (I have not timed it). The PPP connection takes a few minutes to timeout and die. wvdial tries to dial a bit more and then quits. The problems come after the device has sat idle for a few more minutes. It subsequently goes offline. I am unable to revive it except by physically disconnecting it from the USB port and reinserting it.http://www.mail-archive.com/networkmanager-list@gnome.org/msg15988.html
It may be time to switch back to the U598 modem.
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