Patent ID: 8374501
Filing Date: 2013-02-12
Classification: H04B,H04J

Abstract:
1. An optical line terminal connected to a plurality of optical network units, comprising: an optical network interface including: an optical receiver unit to convert an optical signal received from the optical network unit into an electrical signal and to receive a direct current bias control signal used to control a direct current bias to output a direct current bias monitoring signal used to monitor the direct current bias; and an error code detector to detect an error code in the electrical signal to output an error code indication signal; a storage to store therein a direct current bias table indicating a direct current bias corresponding to a direct current bias control parameter of each optical network unit and a dynamic bandwidth allocation information table indicating communication time slot information allotted to each optical network unit; and a control unit to receive the direct current bias monitoring signal outputted by the optical receiver unit and the error code indication signal outputted by the error code detector, and to supply the direct current bias control signal to the optical receiver unit for monitoring the direct current bias control signal by the direct current bias monitoring signal to thereby form one feedback circuit together with the optical network interface wherein the direct current bias control signal is a signal calculated on the basis of the direct current bias monitoring signal and the error code indication signal received by the control unit, and the direct current bias control parameter read out from the direct current bias table and the communication time slot read out from the dynamic bandwidth allocation information table in the storage.