Thanks again [NAME]-Josh Cr  After some searching I hit upon the keyword "port-profiles", which led me to [URL] which confirms the 6 port profiles the S4148T can assume. The OS10 Enterprise Edition User Guide explains the port-profiles in a much clearer way. So glad I asked the question now. After working in this industry for over 30 years, I have zero faith in vendor sales people doing much more than badly processing a quote request.  Cheers for your help. M  
Hi, I am looking for clarification that I can 100% use the 4 x 100 GbE QSFP28 ports AND the 2 x 40 GbE QSFP+ ports on a S4148T-ON switch at the same time? Would be looking to interconnect a pair of S4148T-ON's via the 4 x QSFP28 as a VLT/MCLAG link and use the 2 x QSFP+ on each S4148T-ON as the uplinks to my core infrastructure. I cannot see any restrictions/caveats on combined QSFP+ & QSFP28 port usage in the documentation. The Dell EMC PowerSwitch S4100-ON Specifications states "The compact S4100-ON models provide industry-leading density with up to 48 ports of 10GbE or up to 48 ports of 10GBaseT ports, 2 ports of 40GbE and 4 ports of 100GbE in a 1RU form factor.". I am trying to configure this in FDC however and it is not allowing the config. I am hoping the FDC validation rules are wrong. Has anyone tried/done this? Thanks M  
S4148T-ON QSFP+ & QSFP28 ports.