[Asterisk-Users] Alternatives to SpanDSP??

[Rich Adamson]

As Steve has mentioned several times, it seems the TDM-fxo boards
have an issue with missed frames that no one is addressing. Very few
(if any) TDM users have been able to make spandsp function correctly,
and the few that might have it working don't know why.

Having played around some with zttest (modifying the code to better
understand the issues), it would appear the TDM card consumes about
1.02 seconds to obtain one second of data. That would suggest the
card misses about one frame in every fifty. Haven't figured out why
as yet and don't know that I've got the practical experience to
actually find the root cause.

------------------------

> I sent a mail to this list a week ago regarding exactly this issue.
> Spandsp doesn't work for me (getting <200rows tiffs), but sending and
> receiving faxes through a FXS-FXO bridge (a TDM11B) works without
> problems.
> 
> My motherboard is based an Aopen AK33 (VIA686a chipset, KT133, 700Mhz
> Athlon). I've disabled USB, 2nd IDE, VGA interrupt (runing without X),
> sound.. I've also tweaked PCI settings in the BIOS, testing each time,
> but I don't know what can be wrong. Here is some more info:
> 
> cat /proc/interrupts
>            CPU0
>   0:   23411526          XT-PIC  timer
>   2:          0          XT-PIC  cascade
>   4:         80          XT-PIC  serial
>   8:          1          XT-PIC  rtc
>  10:   23322936          XT-PIC  wctdm
>  12:          1          XT-PIC  acpi
>  14:      91663          XT-PIC  ide0
>  15:      51573          XT-PIC  eth0
> NMI:          0
> ERR:          0
> 
> $ ./zttest
> Opened pseudo zap interface, measuring accuracy...
> 99.975586% 99.987793% 99.975586% 99.987793% 99.987793% 99.987793% 99.987793%
> 99.987793% 99.987793% 99.975586% 99.987793% 99.987793% 99.987793%
> 99.987793% 99.987793%
> 99.987793% 99.975586% 99.987793% 99.975586% 99.987793% 99.987793%
> 99.987793% 99.987793%
> 99.975586% 99.987793%
> 
> Thanks
> Julian J. M.
> 
> On 4/26/05, Steve Underwood <steveu at coppice.org> wrote:
> > Why would you expect a bunch of fax modems to work any better than
> > spandsp? If spandsp doesn't work reliably your system is very likely broken.
> > 
> > I have had hundreds of complaints about spandsp reliability. I have
> > analysed at least 50 or 60 audio logs. I have found maybe 5 or 6 which
> > has real spandsp problems. The rest had frame slips. Of the 5 or 6 with
> > real problems, most have been fixed in the latest version. I have one
> > weird audio log from a new HP combination printer and fax machine that i
> > haven't sorted out yet. These HP machines really are total crap. I have
> > workarounds in spandsp for several blatently wrong things they do. I
> > don't yet know who is at fault with this latest problem.
> > 
> > Regards,
> > Steve
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
> 

---------------End of Original Message-----------------