Have you checked for clocking issues between the Router and the DSU? (garbage-in
garbage-out) I have seen that issue many times. Check the DSU's config vs a
known good config.
Are the errors also being seen on the carrier's frame-switch interface? The guys
who test the circuit do not ussually have access to that info.... They just test
from their test point to your csu...
Good Luck
Dave
Brian wrote:
> On Tue, 10 Oct 2000, Fred Flinstone wrote:
>
> > ok here it goes....
> >
> > we have a customer we manage that is incurring CRC'c, input errors etc on
> > there serial interface.
>
> new install or working install?
>
> >
> > 1. stress tested the circuit many times from the frame cloud through the csu
> > as good
>
> What type of loopbacks did you do? (different loopbacks only go thru
> different parts of circuitry in a csu)
>
> > 2. tries verious cables
> > 3. there are no interface modules i believe its a 2500 something router but
> > i can check
>
> if its a 2500, and you suspect possible serial port problem you can always
> try the other serial port for good measure, although hardware failure is
> probably low on the list I would say.
>
> > 4. the only times crc's cross the link (verified by a protocol analyzer) is
> > when we telnet from our management platform to the site...even if i just
> > enter one character in the telnet session crc's increment
>
> Are you seeing carrier transitions on one end and interface resets on the
> other?
>
> > 5. if you telnet from a neighboring router or dial in this produces no crc's
> > what so ever.
> > -
> > we have 3rd level engineers looking at this i bet if you find an answer I
> > could get you a nice paying job...:) (well maybe)
> > -
> > any help would be appreiciated
>
> Brian
>
> > -
> > thanks...kyle
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> -----------------------------------------------
> Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
> Network Administrator
> ShreveNet Inc. (ASN 11881)
>
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