ASUS GT-AC5400

Overview
A Declaration of Model Names document at the FCC states that this ASUS GT-AC5400 is identical except for its lack of the 10G copper (RJ45) port found in the ASUS GT-AX6000.

A note in the user manual says, "The SFP+ interface only operates at a 10Gbps speed and is not compatible with a 1 Gigabit data rate."