The FOCL architecture involves the connection of the provider's base station (OLT) with ONT or ONU subscriber modules, whose task is to transform optical signals into electrical signals recognized by the user device, be it a PC, laptop or TV panel.ONT is an individual module located in an apartment, ONU is a collective, driveway or house module connected to several apartments.The first PON standard was APON with a speed of 155 megabits per second, the second - BPON, 622 megabits, GPON - the most technologically advanced version, the speed is no longer calculated in megabits, but in gigabits.The distribution infrastructure in a residential high-rise building or at another facility is formed by riser and drop wires.Drop cables are needed to create branches from the main, structurally they are 100% suitable for flexible routing when bending radii are minimal.Riser wires are needed for vertical wiring between floors, from 6 to 12 cores are enclosed in a sheath, they are easy to install and weld.