彻底将骨干层、汇聚层、接入层分离。解决线路时隙利用率的问题，并加入了大量的数据业务。

So the backbone layer, access layer and convergence layer are completely separated. the issue of efficiency of line slot utilization is resolved and data services is added.

youdao

彻底将骨干层、汇聚层、接入层分离。解决线路时隙利用率的问题，并加入了大量的数据业务。

So the backbone layer, access layer and convergence layer are completely separated. the issue of efficiency of line slot utilization is resolved and data services is added.

youdao