>We are having some odd line problems at one of our branches that none of us
>have been able to figure out so I thought I'd throw this one out to the
>group.
>
>From time to time, sometimes many weeks in between events, our csu/dsu
>begins to report OOF and AIS (T1 yellow alarm) errors, but the line will
>stay up for a while. Then, at some point, we'll get a T1 red alarm and the
>circuit will die. We call USWest who then tests the line. According to
>them, they've replaced just about everything between the CO and our
>location, and the line tests clean. Friday it was bouncing every 30-60
>seconds so we had them test it again. Since the test, it has been error
>free but they claim not to have discovered any problems.
From CSU/DSU or router interface statistics, can you plot any pattern
from when you first get errors to when it goes red?
>
>This is the endless cycle so far: the line dies, they test, they report no
>problems, line mysteriously works fine after test for a several weeks, the
>line has problems, the line dies, they test...etc.
Is there any time pattern? Day of week, etc.?
>
>My only remaining guesses are these two: bad csu/dsu that isn't bad all the
>time, or intermittent problems at the location (we share it with a very
>large supermarket.)
I can't resist. Do you have a special problem with bean counters there?
>
>Any thoughts?
>
>TIA,
>John Neiberger, CCNA/CCDA
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