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mike_cameron asked mnakamura answered

L1 Rx Rate does not equal Port Rx Rate

Using the STC counters, the L1 Rx Rate is not the same as the Port Rx rate. L1 Rx rate is always slightly higher.

Does anyone know why this is? Is their an overhead cost in the chassis going between L1 and L2?

Spirent TestCenter (STC)chassisratel1stc counters
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mnakamura answered

The Rx Rate doesn't include interframe gap and preamble. The Rx Rate is what I've seen in some DUTs show in it's rate counters.

The L1 Rx Rate includes the interframe gap and preamble. This is an additional 20 bytes. Normally speaking when an interface is indicated as 10Gbps, this is an L1 rate.

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