The client layer of OCH in the OTN layer is

WDM system, noise is mainly introduced by EDFA amplifier.

In the subway industry, the transmission network is mostly a ring network. According to the length of the subway line, it is generally two or three rings. The MS-OTN solution solves the networking problem of the intersecting ring on the basis of satisfying the tangent ring, to better match the needs of the subway network.

What are the main requirements for data center interconnection scenarios? (Multiple choice)

Among the ultra-long-distance transmission characteristics of our OSN equipment, the 2.5G single-span optical power budget can reach to ( ) when Raman amplifiers are not used at present.