Multi-granularity switch technologies decrease the complexity of optical cross connects by employing waveband routing and fiber routing techniques.

多粒度交换技术利用波带级路由以及光纤级路由，可有效降低光交叉连接器的复杂度。

youdao

Metro networks have phone gear like digital cross-connects, which manage high-and low-speed traffic, and synchronous optical network (Sonet) systems, which come from fiber-optic phone networks.

FORBES: The God Box