Patent ID: 6728248
Filing Date: 2004-04-27
Classification: H04L,H04Q

Abstract:
An optical line terminal which controls one or more optical network units connected thereto, comprising:trigger signal generation means for generating a trigger signal at predetermined intervals; message transmission granting means for producing a message transmission permission which permits one of the optical network units to transmit a message, in synchronization with the trigger signal generated by said trigger signal generation means; and transmission means for transmitting to the optical network units the message transmission permission produced by said message transmission granting means; wherein said trigger signal generation means generates a plurality of trigger signals having different phases by producing one original trigger signal at the predetermined intervals and then shifting the original trigger signal successively by a predetermined time; and said message transmission granting means produces the message transmission permission to be granted to only one of the optical network units, in synchronization with relevant one of the plurality of trigger signals.