[cisco-voip] FXS module breaking

[David Wilson]

Hi Jared,

Thanks for your reply.
Yea, I would have thought the module is FXO, not FXS. I think I need to 
check with my client to see if there's some confusion somewhere :)

What voltage should the module expect ? Is there as standard for this ?

Thanks for your assistance so far.


Kindest regards
David Wilson
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----- Original Message ----- 
From: "Jared Mauch" <jared at puck.nether.net>
To: "David Wilson" <dave at dcdata.co.za>
Cc: <cisco-voip at puck.nether.net>
Sent: Monday, February 28, 2005 9:00 PM
Subject: Re: [cisco-voip] FXS module breaking


> On Mon, Feb 28, 2005 at 08:50:31PM +0200, David Wilson wrote:
>> Hi guys,
>>
>> A client of mine runs a Cisco 1700 series router with a FXS module in it 
>> to route VOIP traffic over his WAN.
>> The FXS module plugs into his PBX. The problem is that the FXS module 
>> keeps breaking every two weeks or so.
>> It just stops working. So far my client has been through 3 FXS modules in 
>> the last month or so.
>> It works perfectly for a while then just dies.
>>
>> Any ideas what could be causing this ? A mis-match between his PBX and 
>> the FXS module that is popping it ?
>> Thanks in advance.
>
> You should attempt to request a EFA on the failed modules.  This
> should assist in finding out why they actually failed.  Perhaps the PBX is
> outputting too much voltage.  Then again, most PBXes have FXS ports
> themselves, so are you sure you meant FXS and not FXO?  If it's a FXS
> module, you probally want to check that whatever phone
> is connecting to it isn't sending the wrong amount of power, causing
> it to be out of spec.  Then again, you could have a faulty power
> supply for the 17xx or something else that is killing your module.
>
> Either way, I hope the whole thing is under support contract
> or warranty so you can replace it.  I would start off with a whole
> new router and perhaps check the voltage on the various lines involved.
>
> - jared
>
> -- 
> Jared Mauch  | pgp key available via finger from jared at puck.nether.net
> clue++;      | http://puck.nether.net/~jared/  My statements are only 
> mine.