Acquisition method and system for optical network unit capability information

The invention relates to an optical network unit capacity information acquisition method, including the following steps: when the preset conditions are achieved, an optical network unit inquiries the own supporting capacity information in the own management information base, then the reporting information containing the capacity information which is in line with the preset format is generated andis sent to an optical line terminal; when the optical line terminal receives the reporting information, the capacity information is extracted and obtained according to the preset format. The invention also relates to an optical network unit capacity information acquisition system, including: a capacity information inquiry module, a reporting information generating module, a reporting information sending module, a reporting information receiving module and a capacity information extracting module. The invention unifies the formats of the capacity information at the both sides of ONU and OLT, which can avoid the problem