Depending on the offered bit rate and the traffic aggregation the technologies can be used together in an access network. When aggregating the bit rates of VDSL only optical technologies are able to handle the aggregated traffic load. Therefore cable access networks are constructed with an optical backhaul and denoted as Hybrid Fibre Coax (HFC). Also, optical access networks can be terminated with a VDSL node with limited range and are called fibre to the building (FTTB), fibre to the cabinet (FTTC) or, more generally fibre to the x (FTTx). Note however that FTTx also includes fibre to the home (FTTH), which denotes the full optical access networks.