These include • fiber to the exchange (FTTEx): VDSL2 is located at the central office; • fiber to the cabinet (FTTCab): fiber-fed cabinets are located near customer premises; and • fiber to the building (FTTB): VDSL2 is placed, for instance, in the basement of a building. Profiles 8a-8b and 12a-12b apply to FTTEx; 17a applies to FTTCab; and 30a, to FTTB (Figure 9).