[cisco-voip] FXS module breaking

[David Wilson]

Hi guys,

How are you keeping ?
Still battling with this....
Seems that I was a little confused as to how this setup was working. You 
were correct. The FXS module is plugged into their 'incoming' line ports of 
their PBX, so there should not be an issue with voltage etc. from the PBX 
The Cisco FXS module does not receive ringing voltage etc. it transmits it 
to the PBX's incoming line.

With regards to the module popping:
Could their router perhaps have the wrong FXS module in it ? Perhaps their 
router is pushing out a higher voltage than the module should use ? Is this 
possible ?
Are their different voltage requirements for different FXS modules ?
Thanks for your help so far.

Kindest regards
David Wilson
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Fax +27 33 345 4155
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support at dcdata.co.za
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----- Original Message ----- 
From: "Jim McBurnett" <jim at tgasolutions.com>
To: "Mike Armstrong" <mfa at crec.ifas.ufl.edu>; "David Wilson" 
<dave at dcdata.co.za>; <cisco-voip at puck.nether.net>
Sent: Thursday, March 03, 2005 3:58 AM
Subject: RE: [cisco-voip] FXS module breaking


Here is an idea for you:

Go to Radio Shack- and buy one of these:
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fnam
e=CTLG%5F011%5F008%5F002%5F000&product%5Fid=22%2D812

Then get a spare PC, and connect it to the meter. Set it up to monitor
the voltage in and out of the card on each port for a period of time-
I'd say 24 hours per port..

The links Mike sent  (THANKS MIKE, I was looking for those..) will help
you put some perspective to it.

I am willing to say this might solve the puzzle.

As an FYI, I have done this kind of thing before using a meter, albeit
older than this one.

Let me what what you find.

Thanks,

Jim


-----Original Message-----
From: Mike Armstrong [mailto:mfa at crec.ifas.ufl.edu]
Sent: Wednesday, March 02, 2005 11:25 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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