PE> 11. Viper locked up after receiving a call, the lights:
PE> OH, DSR, DTR, RI and PWR were on.  The call went like this:

db> The Spirit Viper is not the only modem to ever experience this kind of
db> problem;  I saw a NetComm ProRack M34F (*not* the latest EPROM revision)
db> lock up for *six* *days* (before it was manually power-cycled),
db> believing it still had a carrier (toggling DTR didn't hangup).

PE> I have had it happen to my Netcomm M34F personally.  BTW, you can't blame
PE> the phone lines for a modem lockup!!!  It's always the modem's fault.

Not necessarily. If the line delivers a way out of spec voltage
surge etc to the modem, it may indeed be the lines fault, even
if the modem just locks up and doesnt get killed by that.

db> I wonder if this sort of thing is more a modem problem, or something
db> quirky on the line that leads the modem to think it still has a carrier?

If the modem is designed properly, that shouldnt be possible. It shouldnt
be possible for the line to have something that looks like a proper trellis
protocol carrier. The modem has to be fucking brain dead to think that
anything that can be seen like service tones, even grossly fucked ones,
are a trellis carrier. And even it it did, it should be demanding the
retrain etc and noticing that there is no response to that and giving up.
@EOT:

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