It can solve the retrofitting building without an Internet cable, right? From the first image, the NC-2 can connect any connector from PLC1 to PLC6 right?
Assuming that there is one NS-2 between the two devices, the distance between the devices cannot exceed 300 meters. If it exceeds 300 meters, an NS-2 needs to be installed. Each additional NS-2 can extend the distance by 200 meters.