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Over subscription of 6509 SUP720-10G-3CXL with DFC ??

I want to calculate the oversubscription of the below. Could someone check my homework?

""" 6509 SUP720-10G-3CXL with DFC = 1 * SUP720-10G-3CXL + 8 * LC WS-X6748-GE-TX with DFC  """"""

1 Gbps       = 1.488 Mpps

720 Gbps  = (720 * 1.488) 1071.36 Mpps

9 slot chassis * 48 = 432 mpps

e.g.

Oversubcription of the

6509 SUP720-10G-3CXL with DFC = 1 * SUP720-10G-3CXL + 8 * LC WS-X6748-GE-TX

with DFC 

Oversubscription ration:-  432 mpps : 1071.36 mpps

                                    1 : 2.48 or 1:2.5

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