发明授权
- 专利标题： Optical subscriber line terminal unit and a state transition control method
- 专利标题（中）： 光用户线终端单元和状态转换控制方法
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申请号： US09439304申请日： 1999-11-12
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公开(公告)号： US06650841B1公开(公告)日： 2003-11-18
- 发明人: Tamotsu Matsuo , Kenji Miura , Takashi Monzawa , Yoshimi Toyoda , Jun Asato , Toshinori Koyanagi , Setsuo Abiru
- 申请人： Tamotsu Matsuo , Kenji Miura , Takashi Monzawa , Yoshimi Toyoda , Jun Asato , Toshinori Koyanagi , Setsuo Abiru
- 优先权： JP11-107617 19990415
- 主分类号： H04B1000
- IPC分类号： H04B1000
摘要：
An optical subscriber line terminal unit and a state transition control method are provided which are capable of stabilizing operation. State information storing means, which is a nonvolatile memory, stores state information about the unit. Startup preparatory state shifting means causes a shift to a startup preparatory state at startup. Flag setting means sets an emergency stop state flag during the period of the startup preparatory state if it is judged based on the state information that a state before the startup is an emergency stop state. State transition control means causes a shift from the startup preparatory state to the emergency stop state if the emergency stop state flag is set, and causes a shift from the startup preparatory state to an initial state if the emergency stop state flag is not set.