Erick Perez
2006-Aug-29 12:03 UTC
[asterisk-users] OT: Bandwidth calculations and PCI/PCIX/PCIE
I found this interesting but old white paper at Dell.com <http://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 http://www.dell.com/content/topics/global.aspx/vectors/en/2004_pciexpress?c=us&cs=08W&l=en&s=bsdv here is the link to the same Dell article but in PDF form. http://www.dell.com/downloads/global/vectors/2004_pciexpress.pdf Another interesting document from INTEL www.intel.com/technology/pciexpress/devnet/docs/WhatisPCIExpress.pdf 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). -- ------------------------------------------------------------ Erick Perez Panama Sistemas Integradores de Telefonia IP y Soluciones Para Centros de Datos Panama, Republica de Panama Cel Panama. +(507) 6694-4780 ------------------------------------------------------------ -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20060829/8886a77f/attachment.htm