[Asterisk-Users] DSP Coding

[John Todd]

Ouch.  The 64-port Ai-Logix board goes for (!!!!!) $3559 USD.  Who is 
_paying_ for this stuff?!?

That's >5x multiplier on what I pay for Asterisk, including the $10 
per channel G.729 license.

I will say that I'm looking for a good, dense DSP card that can be 
bodged into Asterisk.  I have a line on a DS-3 card that has Linux 
drivers (channelized to DS-0 level) and I really want to run a DS-3's 
worth of G.729 or iLBC calls out of a single dual-proc 1u machine, 
just to say it's been done.  However, that is impossible without echo 
cancellation and offboard DSP's to handle the real number crunching...

I've done computations with costs based on RLX blade servers doing 
transcoding after offload via TDMoE, and it's still pretty pricey to 
get a DS-3's worth of calls - still in the $25,000-$35,000 range, 
depending on how you count equipment.  That's not to mention the 
development of the DS-3 interface software...

If anyone knows of a good DSP PCI card that could be put to use for 
G.729/iLBC/GSM/G.726 transcoding, let me know.

Never heard about using the GPU to do anything useful.  Sounds 
interesting.  Got links?

Commetrix: only seems to have a board capable of ~30 high-complexity channels
Bittware: maybe.  Website not immediately clear.
Signalogic: http://www.signalogic.com/index.pl?page=sigc67xx_pci   maybe.
Aculab: http://www.aculab.com/products/dna/ip_telephony_card.htm 
only 60 channels.

There are about a zillion companies out there selling CompactPCI 
solutions; someone MUST have a decent generic DSP board on standard 
PCI that can handle 672 high-complexity calls...


JT


At 9:42 PM +0800 on 6/3/04, Leo Ann Boon wrote:
>Heard good things about this card from some of my associates. quite 
>expensive though
>http://www.ai-logix.com/smartdsp_vr_1.html
>
>A wild idea, why not use the graphics card GPU to do the 
>compression? I understand there're some work on using the GPU to do 
>SIMD. Supposed to be faster than the P4 and definitely cheaper than 
>a dedicated dsp board
>
>Miroslav Nachev wrote:
>
>>   Hi,
>>
>>   I would like to find some way for hardware coding instead software
>>(using the Host CPU). Are there any PCI boards just with codecs (DSP)
>>or other way?
>>
>>   Best Regards,
>>   Miroslav Nachev
>>
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