21285 - SCTE Broadband Dec2021 COMPLETE v1

55 Vol. 43 No. 4 - November 2021 Issue technical Fibre to the extension point serving one home A single home may be served by Fibre To The Extension Point (FTTep) with the fibre from the OLT running to a point near the home or business, where it connects to the Optical to Electrical (O2E) conversion unit which transmits electrical signals over exiting wire to the premises such as a telephone line, coax cable or CAT5 wire. See figure 2. Transmission techniques such as G.fast [3], G.hn [4] [5] [9], or MoCA Access [6] may be used. The O2E unit may be located a short distance from the premises or mounted to the outside wall of the premises. This configuration avoids the installation of new fibre inside the building and in the section near the building. The O2E may be powered by current fed from the Residential Gateway (RG) via the connecting wires. This is known as Reverse Power Feed (RPF) [8]. Fibre to the extension point serving multiple homes As described in [7] and shown in figure 3, FTTep serves multiple homes from a Distribution Point Unit (DPU) that connects to the OLT via an optical fibre, and then multiplexes the data from individual wires from each home using transmission techniques such as G.fast [3], G.hn [4][5][9], or MoCA Access[6]. The DPU may be located in a pedestal enclosure, pole mounted, strand mounted, or placed in an underground case. As specified in [7] and [8], the DPU may be powered by current fed from the Residential Gateways via the connecting wires. This avoids the cost of arranging for commercial power at the DPU site and also avoids the cost of back-up batteries for the DPU. By using existing wires from the DPU to, and within, each living unit, the cost of building new fibre is avoided in the last section of access. Furthermore, FTTdp enables sharing of the fibre from the OLT by a larger number of customers than is possible with a conventional Passive Optical Network (PON) FTTP arrangement. Fibre serving customers in Multiple Dwelling Unit (MDU) The DPU may be located in a Multiple Dwelling Unit (MDU) basement, wiring closets on various floors, or outside of the building. See figure 4. This case is often called Fibre To The Building (FTTB), where the wires connecting the DPU to each Figure 2: Fibre to the extension point for one home Figure 3: Fibre to the extension point serving multiple homes