[cisco-voip] FXS problems

[Erick B.]

On the XM and 3700 series , the slips may not be due
to T1 but the clocking configuration on the router.

What other modules do you have in this router (show
diag), do you have a AIM? and what network-clock
commands do you have?

Is this a VWIC-1MFT or VWIC-2MFT? The 2 port VWIC only
has 1 clock chip also so can do line clocking on one
port really only. Port 0/0 is primary by default
though so usually the slips are seen on 0/1 if you
have a 2 porter. 

If you have a PRI and a FXS/FXO module on same router,
it is very important the network-clock commands are
set  right so the timing is synced for voice traffic
to one clock source across all modules else you
will/may see these slip seconds which cause issues
with FAX and Voice. 

Sample network-clock commands:

network-clock-participate wic 0
network-clock-select 1 T1 0/0

See network-clock status:

show network-clock

- Erick

--- Jared Mauch <jared at puck.nether.net> wrote:

> On Fri, Dec 31, 2004 at 08:50:10AM -0500, Campbell,
> Jeremy wrote:
> > Erick,
> > 
> > Thanks for the response.  Here is the info from
> `show controller t1` on
> > the 2651XM router:
> > 
> > T1 0/0 is up.
> >   Applique type is Channelized T1
> >   Cablelength is long gain36 0db
> >   No alarms detected.
> >   alarm-trigger is not set
> >   Version info Firmware: 20040202, FPGA: 11
> >   Framing is ESF, Line Code is B8ZS, Clock Source
> is Line.
> >   CRC Threshold is 320. Reported from firmware  is
> 320.
> >   Data in current interval (863 seconds elapsed):
> >      0 Line Code Violations, 0 Path Code
> Violations
> >      197 Slip Secs, 0 Fr Loss Secs, 0 Line Err
> Secs, 0 Degraded Mins
> >      197 Errored Secs, 0 Bursty Err Secs, 0
> Severely Err Secs, 0 Unavail
> > Secs
> >   Total Data (last 24 hours)
> >      0 Line Code Violations, 0 Path Code
> Violations,
> >      19523 Slip Secs, 0 Fr Loss Secs, 0 Line Err
> Secs, 0 Degraded Mins,
> >      19523 Errored Secs, 0 Bursty Err Secs, 0
> Severely Err Secs, 0
> > Unavail Secs
> > 
> > 
> > I seem to have many slip seconds.  Should I try
> changing the clocking
> > source to see what happens?  Should I contact the
> line vendor to verify
> 
> 	Yes
> 
> > what settings should be used?  
> 
> 	Yes
> 
> 	Usually, you take the clock source from the line,
> but if this is a
> point-to-point T1 between two of your sites, you may
> need to
> provide timing yourself.
> 
> 	ie: one side should be set for line, the other
> should be set
> for internal.
> 
> 	This may fix your problem..  always be wary of
> errored seconds
> of any time (slip, etc..) 
> 
> 	- jared
> 
> 
> > Your assistance is very much appreciated.  
> > 
> > Many thanks,
> > Jeremy
> > 
> > ________________________________________
> > Jeremy P. Campbell
> > Information Systems Director
> > Town of Davidson, NC
> > 704-892-7591 ext. 248 - voice
> > 704-892-3971 - fax
> > 
> > -----Original Message-----
> > From: Erick B. [mailto:erickbe at yahoo.com] 
> > Sent: Thursday, December 30, 2004 10:46 AM
> > To: Campbell, Jeremy; cisco-voip at puck.nether.net
> > Subject: Re: [cisco-voip] FXS problems
> > 
> > What type of hardware modules?
> > 
> > How is the network-clocking set up?
> > 
> > If you do a 'show controller t1' do you have slip
> > seconds (if you have T1s)? 
> > 
> > Any sort of error will cause fax's to fail off and
> on.
> > On the XM routers you need to make sure the
> clocking
> > is setup right so there are no errors. The Slip
> second
> > are sign clocking is not right. It may not be the
> T1
> > circuit but due to clock configuration on the
> router
> > itself.
> > 
> > Erick
> > 
> > --- "Campbell, Jeremy"
> <jcampbell at ci.davidson.nc.us>
> > wrote:
> > 
> > > I have a FXS card in a Cisco 2651XM router, and
> I'm
> > > having trouble with
> > > faxing and data transmissions across through the
> FXS
> > > ports.  Does anyone
> > > have a some advice on what to look for or try?  
> > > 
> > >  
> > > 
> > > Thanks,
> > > 
> > > Jeremy
> > > 
> > >  
> > > 
> > > ________________________________________
> > > Jeremy P. Campbell
> > > Information Systems Director
> > > Town of Davidson, NC
> > > 704-892-7591 ext. 248 - voice
> > > 704-892-3971 - fax
> > > 
> > >  
> > > 
> > > >
> _______________________________________________
> > > cisco-voip mailing list
> > > cisco-voip at puck.nether.net
> > >
> https://puck.nether.net/mailman/listinfo/cisco-voip
> > > 
> > 
> > 
> > 
> > 		
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> 
> -- 
> Jared Mauch  | pgp key available via finger from
> jared at puck.nether.net
> clue++;      | http://puck.nether.net/~jared/  My
> statements are only mine.
> 



		
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