| 摘要 |
The invention discloses are an optical line terminal, an optical network unit, a passive optical network system, an upstream bandwidth allocation method and a rate adaptation method. The OLT comprises: an optical module, a clock and data recovery module, a media access control chip and a control module, wherein, the optical module is configured to receive upstream data sent by ONUs having different transmission rates; the clock and data recovery module is configured to receive the upstream data, recover a clock signal according to the upstream data, and send the upstream data and the clock signal to the media access control chip; the media access control chip is configured to save the upstream data and the clock signal; the control module is configured to, according to the clock signal, acquire an upstream rate of the upstream data, and allocate an upstream bandwidth to the ONU according to the upstream rate.
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