ONT (Optical Network Termination) is a active component of passive optical network at the customer side of a network. There are plenty of various types of theese devices - from simpliest boxes which only converts signal from optical to electrical domain to sophisticated SOHO devices with optical input and many metallic outputs with separated services, WIFI, USB ports for attaching external harddrives or printers, backup power supply or separated outputs for voice services. With these devices is possible to create home network fulfilling todays requirements of toughest customers.