These switches are close cousins to the S4148 family, but they were introduced later January 2019. The estimated date come from the Series Installation Guide. The data sheet says that the ports on the F model can run at 25 or 10 Mb/s. Back pedalling to the 48-port model, some of the ports can run that fast, but the Maverik lacks the CPU horse-power to run them all that speedy.