[Asterisk-Users] Re: Re: E1 hardware for asterisk

[Armin Schindler]

On Tue, 30 May 2006, Christian Victor wrote:
> >> Well - the Junghanns does the echocancel in software and the Sangoma
> >> A104d does it in hardware.
> > 
> > Alright, i just had a look at their product lineup. It seems as not only
> > the A104d but also the low end of their E1 cards (i.e. A101) comes with
> > this onbard echo canceller (EDAC), right?
> 
> No - the A104d and A108d are Sangomas only E1 cards with hardware echo
> cancel.
> 
> The analog A200 has (optional) hardware EC too.
> 
> >> So on the Sangoma echo cancel does not affect CPU performance while on
> >> the Junghanns it does.
> > 
> > And in terms of quality? Does one of them perform noticable better than
> > the other.
> 
> Well - I am not sure how the EC in the Jun ghanns driver is implemented.
> If you have unlimited CPU power (or the hardware EC is very bad
> implemented) it could be of the same quality.
> 
> In fact the Sangoma has 128ms echo cancel per channel. As far as I know
> neither the Digum harware echo cancel nor the available software
> solutions offers this.

I thought the Eicon cards were the only ones with 128ms echo-cancel ;-)

Anyway, what time frame do the software implementations use?
Even with enough CPU power, do these software solutions provide as
good results as a DSP on board?

Armin