gre- gate bandwidth, generally referred to as the sum of upstream and downstream bandwidths on very short copper loops (<100 m), which is more than five times the speed of existing VDSL2 technol- ogy. Currently deployed VDSL2 uses the frequency spectrum up to 17 MHz, whereas the first gen- eration of G.fast technology will use 106 MHz frequency band and eventually move to 212 MHz in the future for higher bandwidth capability. With G.fast operating on a higher frequency band and achieving higher speeds, it also means shorter transmission distances, greater power consumption, and a lower signal-to-noise ratio. The frequency band that is ultimately used is a compromise between performance, costs, and imple- mentation. To achieve greater performance, the G.fast network equipment or DPU needs to be at close proximity to the end users. The DPUs can be installed in a variety of nontraditional locations including on telephone poles, under manhole covers, in pedestals, in the basements of MDUs, on external walls of homes, etc. In many of these locations, access to power is difficult and expensive. One of the solutions to power a remotely located G.fast DPU is through a reverse power feed, which transmits power from the customer premise to the remote node using the distribution side copper network. Unlike VDSL2, which uses orthogonal frequency division multiplexing (OFDM) and frequency- division duplexing (FDD), G.fast uses OFDM and time division duplexing (TDD). In TDD mode, different timeslots are used for upstream and downstream transmission. TDD facilitates hardware implementation and flexible downstream/upstream ratio definition, to establish symmetrical or asymmetrical access, based on service demands. AT&T has actively participated in the development of the G.fast standards in the ITU-T and the Broadband Forum (BBF), and led the way to include the addition of coax cable in BBF's G.fast archi- tecture TR-301, which allows implementation in MDUs using the existing coax wiring. Another key proposal is the concept of dy