n.子層
The supervisory systems and protection schemes of each sublayer is presented according to the characteristics of faults in the photonic layer. 根據(jù)光層中故障的特點(diǎn),提出了光層中各子層的性能監(jiān)測和保護(hù)機(jī)制的要求和實(shí)現(xiàn)方案。