OLT stands for Optical Line Terminal, which is a device that connects end-user devices to a larger telecommunications network. There are several synonyms for OLT, including optical access node, optical network terminal, and fiber access terminal. These terms are often used interchangeably, and each refers to a device that allows for high-speed internet access in homes and businesses. OLTs are an essential component of fiber optic networks, which offer faster and more reliable internet connectivity than traditional copper networks. Regardless of the term used, the function of the device remains the same - to act as the gateway between the customer's premises and the wider telecommunications network.