21285 - SCTE Broadband Dec2021 COMPLETE v1

56 Vol. 43 No. 4 - November 2021 Issue technical living unit are entirely or mostly inside the building. In many existing buildings, it is impractical to install new fibre inside the building. The existing inside wires can be reused to convey very high bit rates. In this case, local power may be readily available, so there may be less need for reverse power feeding. In the event of a power failure, the DPU could revert to Reverse Power Feeding (RPF) from the RGs in each living unit. Clearly, if all the RGs also lose power, then it does not matter if the DPU also loses power. Avoiding a back-up battery at the DPU may avoid a large cost because regulations in some countries would require a very large battery. Service providers can leverage G.fast, G.hn Access or MoCA Access technology as components of the FTTep in MDUs, by capitalising on their complementary architectures to extend the fibre connectivity from the basement of the building with phoneline or coax-based infrastructure, all the way to each floor of the building [6] or [10]. Fixed Wireless Access As shown in Figure 5, fibre access may be extended using wireless technology for the last section to the premises. This is known as Fixed Wireless Access (FWA also called Fixed Wireless Loop) and may employ 4G, 5G or Wi-Fi radio technology. The cost for commercial power delivery and back- up batteries at the serving site should be considered. Also, regulators should decide if fixed-location service or mobile service is the best used of precious radio spectrum, especially since higher frequency radio signals may be highly attenuated by walls and windows. Figure 4: Fibre serving customers in Multiple Dwelling Unit (MDU) Figure 4: Fibre serving customers in Multiple Dwelling Unit (MDU)