1. Customer demand

 A and  B can achieve two-way 110KM communication, and can bear A maximum of 40 service channels.

Supports STM-1, STM-4, STM-16, STM-64, FE, GE, 10GE, 2G FC, and 4G FC.

1:1 protection of fiber links (dual-fiber backup function)

Support service channel protection;

Channel can support 2*1.25G, 4* 1.25g, 8* 1.25g sub-rate multiplexing;

Supports dual power supply redundancy, hot swap, and current equalization.

Power supply protection: overcurrent protection, overvoltage protection, undervoltage protection

Protection, overheat protection, anti-reverse connection protection;

Support network management;

The upgrade and expansion are safe and simple.

2. Scheme topology