国家重点实验室 Comments (continued): Contrary to the synchronous transmission techniques like SDH, Ethernet has been using widely in both transmission link and switching techniques. a)The transmission rate at each level m,mGE,is ten times to that of its adjacent lower level,and m=0.1,1,10,100,which has also the“hierarchy”; b) It is suitable for optical transmission of high speed with up to 100Gbps at one carrier or wavelength A;It is reported that Huawei has launched its optical module with 800Gbps,the highest rate in the world. c) It is the simpleness or "simplification"that makes it to be used widely in transmission link and networking. More details in both Chapter five of Access network techniques PPT.Comments (continued):  Contrary to the synchronous transmission techniques like SDH, Ethernet has been using widely in both transmission link and switching techniques. a) The transmission rate at each level m, mGE, is ten times to that of its adjacent lower level, and m=0.1,1,10,100, which has also the “hierarchy”; b) It is suitable for optical transmission of high speed with up to 100Gbps at one carrier or wavelength 𝛌 ; It is reported that Huawei has launched its optical module with 800Gbps, the highest rate in the world. c) It is the simpleness or “simplification” that makes it to be used widely in transmission link and networking. More details in both Chapter five of Access network techniques PPT