国家重点 Comments (continued): As its name suggests,SDH has following advantages: a)In SDH network,all network elements are synchronous; b)The transmission rate at each level is four times to that of its adjacent lower level,and N=1,4,16,64,256,which explains the “hierarchy'”; c) It is suitable for optical transmission of high speed with up to 40Gbps; d The powerful network management makes it easy for network operators to configure and maintain,which satisfies partly the requirements of NGN#(New/Next Generation Network) with reprogrammable,reconfigurable and reconstruction- enabled features e) It has the pointer adjustment mechanism that allows the "load to vary within some limited ranges,which means the "load"may be faster or lower than the standard rate. More details in Chapter three of Access network techniques PPT
Comments (continued): As its name suggests, SDH has following advantages: a) In SDH network, all network elements are synchronous; b) The transmission rate at each level is four times to that of its adjacent lower level, and N=1,4,16,64,256, which explains the “hierarchy”; c) It is suitable for optical transmission of high speed with up to 40Gbps; d) The powerful network management makes it easy for network operators to configure and maintain, which satisfies partly the requirements of NGN# (New/Next Generation Network) with reprogrammable, reconfigurable and reconstructionenabled features ; e) It has the pointer adjustment mechanism that allows the “load ” to vary within some limited ranges, which means the “load” may be faster or lower than the standard rate. More details in Chapter three of Access network techniques PPT
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
国家重点实验室 Conclusion √AS the representatives of synchronous- and asynchronous-transmission switching,SDH and Ethernet are significantly important,and have been using widely and extensively in Access,Metropolitan, Core networks. It is mandatory that students have the firm basic knowledge about the both. More details in Data and computer communication authored by William Stallings,and Chapters three and five of Access network techniques PPT
Conclusion As the representatives of synchronous- and asynchronous-transmission & switching, SDH and Ethernet are significantly important, and have been using widely and extensively in Access, Metropolitan, Core networks. It is mandatory that students have the firm basic knowledge about the both. More details in Data and computer communication authored by William Stallings, and Chapters three and five of Access network techniques PPT
N 国家重点实验室 2.The sorts and definitions of networks There are many ways to sort various networks. Geography 。 Transmission medium ·Technique used Services provision ·Functionality ● ■ Here,we introduce some ones that are based on different features and have been recognized professionally. 2020/4/23 Dr.Zhangi xU,National Key Lab on ISN,Xidian University 14
2020/4/23 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 14 2. The sorts and definitions of networks There are many ways to sort various networks. • Geography • Transmission medium • Technique used • Services provision • Functionality • … Here, we introduce some ones that are based on different features and have been recognized professionally
N 国家重点实验室 1)Geography Name Definition Main features Body area A body area network (BAN),also referred networking to as a body sensor network (BSN)or a the networking (BAN),a.k.a. medical body area network (MBAN),is a area is human wireless body wireless network of wearable computing body,covering area network devices.Through gateway devices,it is 2M range. (WBAN) possible to connect the wearable devices on the human body to the Internet. A home network is a group of devices, the networking Home and such as computers,game systems, area is home or small office printers,and mobile devices,that are small office networking located at a home area and connected covering together and able to access to the several tens Internet via a home network gateway. meters. 2020/4/23 Dr.Zhangi xU,National Key Lab on ISN,Xidian University 15
2020/4/23 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 15 1) Geography Name Definition Main features Body area networking (BAN), a.k.a. wireless body area network (WBAN) A body area network (BAN), also referred to as a body sensor network (BSN) or a medical body area network (MBAN), is a wireless network of wearable computing devices. Through gateway devices, it is possible to connect the wearable devices on the human body to the Internet. the networking area is human body, covering 2M range. Home and small office networking A home network is a group of devices， such as computers, game systems, printers, and mobile devices， that are located at a home area and connected together and able to access to the Internet via a home network gateway. the networking area is home or small office , covering several tens meters