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SPF : 1G ( SKU:  740-013111           1000 Base-T RJ45 SFP Module) 

SFP+ :   10G

SPF28:  25G ( 10G )

They share a similar form factor as SFP/SFP+

While SFP28 is backward compatible with SFP+ and SFP, the reverse isn't true; an SFP+ port cannot use an SFP28 transceiver.


QSFP :  40G ( or QSFP+  ??? )



QSPF28 : 100G



QSFP56-DD  : 400GMPO connector

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