[cisco-voip] Adjusting attenuation on PRI's for echo...

[Ed Leatherman]

Have a TAC case opened up on this one. The engineer recommended I take out
the attenuation and instead increase the echo tail lenght to 64ms to
eliminate the echo before I change the attenuation. Still have fax problems
but it seems that fixed the echo just as well as the attenuation settings
did.

Users reported problems faxing between ports/VG's now too, so i think this
isn't PRI related at this point. going to send cisco some debugs from the
vg248 and a sniffer trace soon as the network people get it setup. Will
update the list if anything interesting pops up.

On 6/11/07, Ed Leatherman <ealeatherman at gmail.com> wrote:
>
> They are all 6608 T1 ports, i'm looking at the HTML page generated from
> the particular ports, not seeing clock glitches and conseq sevErrSecs
> (assuming those corelate to the stats that IOS spits out). If there are any
> CatOS commands that are the equivalent, I havent been able to figure them
> out.
>
> Been running for years with nary a problem till this past week. Clock
> source is network, i haven't put in a service request yet for verizon to
> check their side though.
>
>
> On 6/11/07, Jason Aarons (US) <jason.aarons at us.didata.com> wrote:
> >
> >  Show network clock
> >
> > Show controller t1
> >
> >
> >
> > Are you seeing clock slips errored seconds and what is your clock
> > source? Have you checked other side for clocking/errors?
> >
> >
> >
> > *From:* cisco-voip-bounces at puck.nether.net [mailto:
> > cisco-voip-bounces at puck.nether.net] *On Behalf Of *Ed Leatherman
> > *Sent: * Monday, June 11, 2007 4:24 PM
> > *To:* ciscovoip
> > *Subject:* [cisco-voip] Adjusting attenuation on PRI's for echo...
> >
> >
> >
> > Anyone had to adjust attenuation on PRI connections for echo and have it
> > affect your fax machines? I made a small change to the inbound attenuation
> > last Sunday (went from -1dB to -2dB). Users are reporting that all last week
> > they had trouble receiving complete faxes (from multiple VG's). I hate to
> > roll back the change because it seemed to fix our echo problem. Maybe I can
> > increase the outbound attenuation at the same time I remove the previous
> > change to make up for it?
> >
> > PS I hate fax machines.
> >
> > --
> > Ed Leatherman
> > Senior Voice Engineer
> > West Virginia University
> > Telecommunications and Network Operations
> >
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>
>
> --
> Ed Leatherman
> Senior Voice Engineer
> West Virginia University
> Telecommunications and Network Operations
>



-- 
Ed Leatherman
Senior Voice Engineer
West Virginia University
Telecommunications and Network Operations
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