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

[Steve Underwood]

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