| 摘要 |
PROBLEM TO BE SOLVED: To provide a passive optical network system in which communication signals from a master station to plural slave stations are time-division multiplexed and transmitted, and the slave stations different in transmission speed are mixedly contained. SOLUTION: The master station (OLT) performs ranging for each transmission speed, and grasps all the slave stations different in transmission speed for each transmission speed, and generates a frame including signals of a suitable transmission speed corresponding to each slave station. When the frame is generated, in a downstream signal in which signals of plural transmission speeds are mixed, dummy signals 5110, 5111 are set at a place where the transmission speed is changed, and a time necessary to follow a change in level of a received signal due to a change in optical level caused when the transmission speed is changed in each ONU is secured. As a result, each ONU avoids a reception error occurring in the time necessary to follow. COPYRIGHT: (C)2010,JPO&INPIT |
