[c-nsp] Strange T3 failure on 7206

[Max Pierson]

Any attenuators involved?? I've actually experienced the same thing before
and traced it back to what we believed to be a bad attenuator. Replaced it
and LOS cleared right up. I only mention it because the Adtran MUX that was
in use at that facility didn't have a way to dial down the DB's.

On Tue, Jan 18, 2011 at 11:52 AM, Jay Hennigan <jay at west.net> wrote:

> We got an alarm that a T3 to a customer was down.  PE router showed
> interface up, line protocol down.  CE router showed down/down.  Provider
> side goes to an Adtran Opti-mux out OC-12 to Verizon, customer end is a
> Verizon mux on premise.
>
> Called Vz and they claimed it was CPE, they saw "idle loop" towards our
> 7206 CE router.  We shut/no-shut the interface and rebooted the 7206, no
> joy.  I'm not familiar with the term "idle loop", we were showing
> receive LOS and sending RAI.
>
> Customer IT guy came on site and saw CLOS on Verizon mux, alarm light on
> 7206.  He disconnected the cable and put a coax loop towards the 7206.
> Interface came up-looped right away.
>
> Reconnected to Verizon mux and everything came back up nice and happy.
> That's what is bugging me.  Circuit has been running fine for months.
>
>
> --
> --
> Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
> Impulse Internet Service  -  http://www.impulse.net/
> Your local telephone and internet company - 805 884-6323 - WB6RDV
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