[cisco-voip] FXS module breaking

[Court Schuett]

I've been fighting almost the exact same problem lately.  We have an
ICS7700 and things would be working fine, and then some of the FXS ports
would just stop working.  A little investigation turned up a few things
though.

We are using an intercom system off of one of the FXS ports.  It
wouldn't work with MGCP, so we had to use H323.  That wasn't too bad,
except that a reconfigure of the ports would get them to work (with a
regular analog phone) when they were MGCP.  I kept digging and found
that, for some reason, the ports would get stuck in an OFF-HOOK state.
They would cycle through the various states until they ended in PARK.
No real cause that I could find.

The solution (with help from TAC) was to upgrade the IOS.  That did the
trick the first time.  Of course, that was after the first TAC case
where they sent us replacement hardware.  And that worked too, except it
did the same thing two weeks later.  Hopefully, this is a permanent fix.


Good luck.  

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Mike Armstrong
Sent: Wednesday, March 02, 2005 10:25 AM
To: David Wilson; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] FXS module breaking

Wow.  "Just stops working" is a little ambiguous.  If a reboot of the
router 
doesn't help, then I think you can rule out software, and I gather that 
replacing the module fixes things, so it's almost certainly hardware.
If it 
were me, I'd just buy a couple of spares (check eBay) and keep my
Smartnet 
contract paid up.  After you send in a few for replacement, eventually
Cisco 
might get interested in finding out what's wrong with them.  Even if you

don't have a service contract, you might persuade Cisco to analyze one
to 
determine why it failed.  Here's a couple of links to CCO tech docs that

might help, but unfortunately don't give a step-by-step troubleshooting 
baedeker:

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a
008011c7f3.shtml

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a
0080094fac.shtml

I'm still betting on an external problem that zaps the interface.  The 
startup diagnostics would check out most of the inboard circuitry, I'd 
guess, but can't do much to check the outside interface.  If there's any

chance of that, a simple surge protector on the line might solve the 
problem.  There may be a loopback test of some sort you could try, but I

couldn't find any info on that handily.

mike

----- Original Message ----- 
From: "David Wilson" <dave at dcdata.co.za>
To: "Mike Armstrong" <mfa at crec.ifas.ufl.edu>;
<cisco-voip at puck.nether.net>
Sent: Wednesday, March 02, 2005 6:10 AM
Subject: Re: [cisco-voip] FXS module breaking


> Hi Mike,
>
> Thanks for your response.
> From what I can understand it seems the FXS module just stops working.
Are 
> the some tests I could perhaps run in the router to give me more info
?
>
>
> Kindest regards
> David Wilson
> _______________________________
> D c D a t a
> Tel +27 33 342 7003
> Fax +27 33 345 4155
> Cell +27 82 4147413
> http://www.dcdata.co.za
> support at dcdata.co.za
> Powered by Linux, driven by passion !
> _______________________________
>
> "Computers are not intelligent. They only think they are."
>
> ----- Original Message ----- 
> From: "Mike Armstrong" <mfa at crec.ifas.ufl.edu>
> To: <cisco-voip at puck.nether.net>; <dave at dcdata.co.za>
> Sent: Tuesday, March 01, 2005 1:39 PM
> Subject: [cisco-voip] FXS module breaking
>
>
>> What't the nature of the connection?  I'm wondering if an induced
current 
>> is zapping the analog interface -- lightning, wire passing by a large

>> load of some kind, etc.  Any more detail about exactly what
"breaking" 
>> means?
>>
>> Mike Armstrong
>> UF/IFAS CREC
>> Lake Alfred, FL
> 

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