[c-nsp] Quick 6500 question...

[Nick Hilliard]

On 7 Feb 2012, at 15:29, Mack McBride <mack.mcbride at viawest.com> wrote:
> But the non-E is theoretically capable of much higher speed than the 40G cards supported.
> IIRC the E chassis is theoretically capable of about double the BW provided by the Sup2T.
> My take is that Cisco is intentionally overdesigning the chassis to reduce issues.

The issue is more that a backplane like this will have electrical characteristics which determine an expected BER, assuming that the electrical signalling operates over a particular bandwidth spectrum, and assuming a specified encoding method (we normally refer to electrical spectrum utilisation along with the particular encoding method as plain old "bandwidth" - although technically there is a difference between the two things).

So there is a trade off between the two.  I'm sure it's perfectly possible to run a non E chassis at 80g, but I'm equally sure that this would drive up the BER, and that people would complain about it.  Difficult to get away from physics.

Anyway, I don't really have an issue with this - the E chassis has been sold more or less exclusively since 2005 or so, so any remaining in deployment will be well past their accounting write off time. 

Nick


> LR Mack McBride
> Network Architect
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jeff Kell
> Sent: Tuesday, February 07, 2012 8:21 AM
> To: cisco-nsp
> Subject: [c-nsp] Quick 6500 question...
> 
> Quick reality check...
> 
> Is the difference in the E-series chassis only in available power?  Has nothing to do with backplane bandwidth?
> 
> Jeff
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