[Asterisk-Users] Sangoma E1 board Experience

[Rich Adamson]

> 
> >Its not a limitation. Its an architectural design which is based on pulse 
> >code modulation (pcm) standards, which essentially says:
> > - 8,000 audio samples per second,
> > - each sample is an 8-bit value
> > - resulting in 64,000 bits/second (like g711 codec standard)
> >  
> >
> Thank you for your answer, but I don't think you read/understood my 
> question?
> 
> The Zaptel driver uses a 8 byte buffer for buffering G.711 in each 
> direction. This has nothing to do with the sample rate, but how large 
> packets you can buffer the voice for to be transported through the PCI 
> interface. I get the impression that the Digium boards are limited to 8 
> bytes (1 ms ) by reading the zaptel driver. But, I don't know this cause 
> I have no hardware manual that cover the PCI interface. I was hoping 
> that the Sangoma boards offered a more variable buffer size???

Spec sheets are available for the TigerJet 320 pci chipset as well as
the Silcon Labs 3050, 3210 chip sets used on the TDM card. If you dig
through those I think you'll find that it would difficult if not impossible
to change the card's infrastructure since its based on the standards
noted above.