[Asterisk-Users] Qs about FXO/FXS cards

[Rich Adamson]

One rather common problem (which started the most recent thread on the
subject) is the card simply fails to process pstn-fxo calls. Most seem
to suggest it happens about once per week or two. When it fails, 
reloading the drivers clears the problem (which requires taking
* down to do it). There are no log messages to hint at why.

Another problem is documented in bug #2023 (and 2022), which describes 
voicemails left via a pstn-tdm call are consistently very low volume.

------------------------
> What exactly are people seeing when they have "issues" with their TDM
> card? 
> 
> 
> Brian Greul
> Texas Shirt Company
> www.txshirts.com
> 713-802-0369 / 713-861-6261 (fax)
> 
> -----Original Message-----
> From: Rich Adamson [mailto:radamson at routers.com] 
> Sent: Saturday, January 01, 2005 3:09 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Qs about FXO/FXS cards
> 
> > I am going to be putting together my first * system using FXO/FXS 
> > interfaces. All the systems I have set up thus far have been pure VoIP
> 
> > setups.
> > 
> > The system I need to set up should have 3 FXO interfaces and 1 FXS 
> > interface, as well as several SIP phones. I have noticed people 
> > complaining about Digium's TDM cards - are these isolated incidents or
> 
> > are these cards unreliable? I intend to get the TDM400P with the 
> > necessary FXO/FXS boards - can I expect the installation to be 
> > somewhat straightforward? Any tips to avoid grief?
> 
> I think the best that anyone can estimate at this time is that a problem
> exits of some sort and it might be related to a combination of factors,
> one of which seems to involve specific motherboard designs. There are
> far too many people complaining about the same issues with the TDM card,
> several of which opened cases with digium support and got no response.
> It should be fairly obvious from the many postings on this list since
> that card was announced that something is not right, and at least some
> of those systems have digiums T1 cards on the exact same pci bus that
> are operating just fine.
> 
> If you read through the archives, you'll see a number of people flapping
> their jaws using adjectives and adverbs about what they think the issue
> happens to be, but the majority (if not all) don't have a TDM card and
> apparently wouldn't touch one with a ten foot pole.
> 
> What is obvious at this point is:
> a. no one on the -user list is going to fix (or even hint with any 
>    degree of authority) the root-cause
> b. don't ever post anything to the -dev list regarding a TDM card as
>    that is NOT the forum for digium cards or drivers, c. digium support
> is not addressing the issue, and, d. the amount of effort required to
> support the TDM card (stop *, restart
>    the drivers, start *) in its present condition is far greater then
>    what any reasonable non-technical customer will endure.
> 
> Since this has been an on-going battle, I'd suggest avoiding the TDM
> card totally, or, take the 50-50 risk to see how high you can raise your
> frustration level.
> 
> > Would it make more sense to get 3 cheap X100P's and use some kind of 
> > ATA for the FXS? Will obviously save a whole bunch of money, but will 
> > there be significant added complexity?
> 
> Three x100p's are likely to cause even more issues due to the high level
> of system interrupts. (Note: digium has removed them from their web
> site.)
> 
> Current experience... three spa-3000's are far more stable then a TDM
> card, and you'll get three fxo's plus three fxs's for less money.
> 
> 
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