The U2H403SV is a high-performance Universal Serial Bus (USB) 2.0
U2H403SV is designed with Multiple Transaction Translator (MTT) USB 2.0
Multiple Transaction Translator (MTT) provides individual TT control
logics for each downstream port. This is a performance better choice for
USB 2.0 Hub.
The U2H403SV works backward compatible either when any one of downstream
ports are connected to an USB 1.1 compliant device, or when the upstream
port is connected to a USB 1.1 compliant host.