Cisco calls their busses CxBus, CyBus which have the same clockrate (something about 22 MHz) but differs with the "largeness" of 32 and 64 bits and uses them for transport among different modules. The PCI is used only internaly on the same module. ---------- Od: Jacques Vidrine[SMTP:nectar@staff.communique.net] Odesláno: 22. července 1997 2:36 Komu: 'Jeremiah Kristal'; Chris Wilson Kopie: Perry E. Metzger; nanog@merit.edu Předmět: RE: is there a market for this? FWIW, I can't confirm this at this second, but I believe that at least the cisco 7200 series routers have a three PCI bus backplane. And it is claimed to support an OC-3c VIP2 port adapter, although I haven't put mine in action to try yet (and when I do I won't be running anywhere near 155 Mbps anyway). A single VIP2 port adapter can only connect to one of the three buses, so presumably cisco believes that PCI is up to the task. I don't know what the clockrate is, and I don't know if it is 32-bit or 64-bit.

-----Original Message----- From: Jeremiah Kristal [SMTP:jeremiah@corp.idt.net] Sent: Monday, July 21, 1997 5:40 PM To: Chris Wilson Cc: Perry E. Metzger; nanog@merit.edu Subject: Re: is there a market for this?

On Mon, 21 Jul 1997, Chris Wilson wrote:

Actually, I've seen a PCI-based box doing 15MByte/sec sustained read/write to disk, so it is possible to do it, but it's not likely to be standard for quite a while. I certainly think that an OC-12 card would be overkill though. I'm also wondering why someone who can afford an OC-x would be trying to save a couple bucks by using a PCI-based router. Once you get into this type of bandwidth, I think a bus becomes a serious chokepoint.