I found this interesting but old white paper at Dell.com tech solutions and another one from INTEL.
It compares bandwidth usage of a PCI, PCI-X, PCI-E in 33/66/100/133 mhz bus and different technologies that can saturate the bus.
It helped me understand the bandwidth required for TDM (sangoma/digium) cards and how far can I push the PCI bus in an old and new motherboard.
I hope it help others to understand how much a network card can pump and make calculations about consumptions in TDM cards.
make sure the link is a one-line in your browser
Original online document
here is the link to the same Dell article but in PDF form.
Another interesting document from INTEL
The facts learned from these documents are:
a- 3.3volts/32bit PCI cards can be used in PCI-X slots. (i just discovered that, sorry for living under a rock)
b- The slowest PCI card in Mhz will dictate that PCI-X bus speed. So avoid degradation by not installing a PCI card and a PCI-X card in the same bus (check you motherboard design), your motherboard design usually have two buses.
c- If you use a PCI-X based implementation motherboard, you will not saturate the bandwidth of the board, using Quad or Octal port cards (e1/t1/j1).
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Erick Perez
Panama Sistemas
Integradores de Telefonia IP y Soluciones Para Centros de Datos
Panama, Republica de Panama
Cel Panama. +(507) 6694-4780
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