Backplane vs Switching capacity

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Mar 31st, 2014
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Hi All,

I was reading H3C 7500 specs (due to some competitive requirement) and found that they have listed backplane and switching capacity separately


The H3C S7500 Series switch deploys SalienceTM III series engines with maximum switching capacity 768Gbps, with throughput as much as 432Mpps, while the backplane capacity reach 1.68Tbps.


I thought switching capacity and backplane capacity are same, but it seems they arent. I know its not cisco related but i am sure its general, can someone please help me understand this ?



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Muhammad Thanveer Fri, 04/11/2014 - 01:39
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Hello John,

Backplane and switching capacities are slightly different. Backplane capacity is similar to bus speed in a computer. 
It defines the bandwidth of the module-to-module interconnect in large multi-module switches. 

Backplane speed is just one component of total speed, it means total backplane throughput of a switch would be the sum of the port speeds.

Switching speed is the rate that a port-to-port transfer can be made.



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