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RE: is there a market for this?
From: jan.novak () aliatel cz (Jan Novak)
Date: Tue, 22 Jul 1997 10:03:41 +-200

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.






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