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Spirent KB Article
Doc ID: FAQ15738
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Spirent TestCenter: The FX2 cards support 64K Tx streams per 40G QSFP+ port according the datasheet. If the customer use it in 10G mode do we have to divide this number by 4?
40G versus 10G
Maximum number of streams the same when switching from 40G to 10G using the FX2-40G-Qx module
No difference when using it in 10G mode; i.e., it will still be 64k Tx streams per port.
No difference between the dual speed and 10G only module as well.
The only number (as of today) that has to be divided by 4 is the capture buffer - it is 256 MB per port in 10G mode and 1G per port in 40G mode.
Product : Spirent TestCenter,PGA,FX2,Hardware Module