User units (CPE, HAG, modems, routers, gateways, gateways) are designed for home and / or business customers. It is used to connect end devices (computers, laptops, IP phones, IP set-top boxes, etc.) to the ISP's network, which can be Ethernet (FTTB or FTTH) or xDSL (VDSL2, ADSL2, SHDSL and G.SHDSL).