One of the operators realized that problems will occur when they update a OSN 3500 based 2.5Gbit/s metro transport network to 10Gbit/s.The solution in here was worked out after quite a lot of study on the current network infrastructure and equipments features of existing suppliers
furthermore it is also a significant reference for Huawei about the implementation of smooth evolution from low speed service on OSN series based metro transport network to high speed.