OPTICAL LINE TERMINATION, OPTICAL NETWORK UNIT, OPTICAL COMMUNICATION SYSTEM, TIMING CONTROL METHOD, AND RECORDING MEDIUM STORING PROGRAM FOR APPARATUS

摘要

A plurality of lines which differ in transmission rate can coexist using a time division multiplexing (TDM) technique without any signal collision. An optical line termination (OLT) is connected to a plurality of lines which differ in transmission rate, and includes a timing extraction unit which extracts data transmission timing from a predetermined one of the plurality of lines and a timing allocation unit which allocates data transmission timing for a different line not to collide with the data transmission timing extracted by the timing extraction unit. An optical network unit (ONU) corresponding to the different line transmits data based on the allocated data transmission timing.