[Asterisk-Users] DS3000P - 20 E1 capacity on single card

[Andrew Latham]

It means something to me. 

Kevin

I am far from needing one of these yet but I am interested in them. I
think that clearing up who does the transcoding would help some
people. I wonder if someone will use this for large scale network
needs. Image Stream is just down the Highway from me and I know that
they are using ~1 gigahertz processors on their T3 routing systems
with multiple NICs.

What would be a real example of use. EG: A Tyan Transport TX46 and
this card could handle what ever you could put on it. What is the
realistic low end of system that could support this card.

Andrew



On 4/13/05, Steve Underwood <steveu at coppice.org> wrote:
> Kevin P. Fleming wrote:
> 
> > Andrew Kohlsmith wrote:
> >
> >> Yes, but then what are you doing with it?  You're shuttling the new
> >> data to/from a network card in a lot of cases.  Combined with other
> >> traffic over the PCI bus for normal system operation I could see you
> >> coming close to the limitations of regular ole PCI.
> >
> >
> > Absolutely. The DS3000P will definitely support PCI-X, and probably
> > bus speeds of 100MHz or higher, so at least if your system has that
> > you will have plenty of bus capacity. Many servers nowadays actually
> > have their NICs on a separate PCI bus as well, so the TDM and NIC
> > cards won't be contending for the same resources.
> >
> >> True enough, but you still need to marshall the data going between
> >> PCI busses and to system memory.  Certainly not impossible problems
> >> to overcome but they do add to the fun of getting a low latency VOIP
> >> system together.
> >
> >
> > Very true; realistically, modern PC hardware has more than enough
> > bandwidth to do what is required. The real issue is timing, based on
> > contention for resources, and how that impacts latency. The existing
> > boxes out there (not PCs) that handle DS3 have far lower performance
> > metrics than a 3GHz P4 or similar system :-)
> 
> That is a meaningless comparison. Those boxes don't the audio touch the
> processor, or its buses.
> 
> Regards,
> Steve
> 
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Andrew Latham

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