As shown in Figure 1-3, the point-to-point network is the simplest network
application mode of the equipment, and is generally used in end-to-end service
transmission. Other network modes are based on the point-to-point network.
Generally, the point-to-point network consists of OTM stations and OLA stations,
able to meet the demands of ULH (Ultra Long Haul) transmission systems through
the combined application of distributed Raman amplifying, FEC (Forward Error
Correction) and DGE (Dynamic Gain Equilibrium) technologies.