This is per pc go to My Network Places icon in your desktop ,right click ------>Properties-------> local area connection------>properties------->at the general tap there is a configuer tap ,press it --------->Advanced tap ,in this dialog look to property &try to find Link Speed &Duplex choose it &at the right panel adjust the desired value (i.e 10Mbps) But if you want for the whole LAN ,it should be a control switch for the B.W behind your LAN switch . Best Regards,