[c-nsp] OK, what is a cheap and dirty hack to test a port

[Ted Mittelstaedt]

Before everyone goes off, I've dealt with clocking issues before
and am well aware of these.

This particular circuit when it first started acting up, was pinned
one side internal, the other side recieve clock from the network.
After replacing the DSU card didn't help, I pinned both sides
to recieve clock from the network.  It made no difference.

Incidentally all of the other spans going to the router (which are
working) are pinned both sides recieve clock.

Ted

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of Roy
> Sent: Wednesday, October 15, 2008 7:36 AM
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] OK, what is a cheap and dirty hack to test a port
>
>
> Just because its a point to point circuit doesn't mean one side has to
> have internal clocking.  This is only true if the circuit is copper all
> the way.   There are lots of reasons that the telco would have its own
> equipment installed on the circuit and you would need network timing.
>
> Roy
>
> Luan Nguyen wrote:
> > Is it a Verizon circuit?
> > We have a T1 circuit with Verizon and have the same problem.  We have a
> > point to point circuit, so one side has clocking set to
> internal to provide
> > the clocking and the other side feeds from the line.
> > I wrote the problem up at http://ccie-security.blogspot.com/
> > But basically, it will be up for a some hours then down, then I
> call them to
> > test and it's good again.  Sometime it's good just by unplug
> the cable and
> > plug it back.  Like you, we changed everything and that didn't help.
> > Finally, we talked to a knowledgeable Verizon tester and he
> mentioned the
> > rate on the line is ~17 which is high.  It should be around 0
> or negative.
> > He said that's because of mismatch clocking between our hardware and the
> > central office crossover equipment. The normal tester won't
> look at this,
> > they only do the loopback pattern testing, so you should ask
> them about the
> > rate of your line.
> > They swapped one smart jack, but that didn't help, so they will swap the
> > other today.  Hopefully that will do it.
> > Good information here about troubleshooting T1
> >
> http://www.informit.com/library/content.aspx?b=Troubleshooting_Rem
ote_Access
> &seqNum=61
>
>
> Luan Nguyen
> Chesapeake NetCraftsmen, LLC.
> www.NetCraftsmen.net
>
> ...
>

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