Active Network Systems OLT - ONT - ONU

Fiber to the Home (FTTH) has started to be taken seriously by telecommunication companies around the world, enabling technologies to develop rapidly. Active optical networks (AON) and passive optical networks (PON) are the two major systems that make FTTH broadband connections possible. PON that can provide cost-effective solutions are more ubiquitous in the majority of the FTTH deployments. 
 

ONT stands for Optical Network Terminal. ONU stands for Optical Network Unit. An ONT and an ONU are the same things. ONT and ONU both refer to the consumer end equipment in an optical fiber to the home (FTTH) communication link.