国家重点实验室 Name Definition Main features A local area network (LAN)is a the networking area Local area computer network that is local area network(LA interconnects computers within covering i from N#局域网， a limited area such as a several tens of 局部区域网络 residence,school,laboratory, meters to several in1980) university campus or office kilometers. building.Ethernet and Wi-Fi are the two most common technologies in use for it Metropolitan MAN provides the networking the networking area Area facilities that interconnects is a city,covering Network local area networks (LANs)in a from several to (MAN#,城域 city into a single larger one. several tens,even a 网)】 hundred kilometers
2020/4/23 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 16 Name Definition Main features Local area network(LA N# 局域网， 局部区域网络 in1980’)) A local area network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, university campus or office building. Ethernet and Wi-Fi are the two most common technologies in use for it. the networking area is local area , covering from several tens of meters to several kilometers. Metropolitan Area Network (MAN#, 城域 网) MAN provides the networking facilities that interconnects local area networks (LANs) in a city into a single larger one. the networking area is a city, covering from several to several tens, even a hundred kilometers
N 国家重点实到 Name Definition Main features It is a long-distance network the networking Wide connecting computer area is a nation, area communication of LANs and/or across several network( MANs in different a areas.It continents, WAN# usually spans a large physical covering from 广域网) range,covering 1 from tens of hundreds to kilometers to thousands of thousands kilometers. t can connect kilometers. multiple regions, cities and countries, or across several continents via sea optical fibers and provide long-distance communication, forming an international long-distance network. 17
2020/4/23 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 17 Name Definition Main features Wide area network( WAN# 广域网) It is a long-distance network connecting computer communication of LANs and/or MANs in different areas. It usually spans a large physical range, covering from tens of kilometers to thousands of kilometers. It can connect multiple regions, cities and countries, or across several continents via sea optical fibers ,and provide long-distance communication, forming an international long-distance network. the networking area is a nation, across several continents, covering from hundreds to thousands kilometers
N 国家重点实验室 2)Transmission medium Transmission medium can be categorized two kinds:wired and wireless Medium types Main features Twisted Pair XDSL (digital subscriber Line),2M~54 Mbps, let telephone user to access to Internet It usually refers to t the former,typical Cable (coaxial cable, application is HFC (Hybrid Fiber Coax),which electricity line) uses fiber between the service provider and residential zone,while employs coax within old residential buildings. It has been using widely in the form of EPON (Ethernet Passive Optical Network) in Optical fiber residential zone,connecting various routers or switches together. 18
2020/4/23 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 18 2) Transmission medium Medium types Main features Twisted Pair xDSL (digital subscriber Line), 2M~54 Mbps, let telephone user to access to Internet Cable (coaxial cable, electricity line) It usually refers to the former, typical application is HFC (Hybrid Fiber Coax), which uses fiber between the service provider and residential zone, while employs coax within old residential buildings. Optical fiber It has been using widely in the form of EPON (Ethernet Passive Optical Network) in residential zone, connecting various routers or switches together. Transmission medium can be categorized two kinds: wired and wireless
N 国家重点实验室 Classification Band Initials Frequency Range Characteristics Extremely Low Freq. ELF <300Hz Infra Low Freq. ILF 300 Hz-3 kHz Ground wave Very Low Freq. VLF 3 kHz 30 kHz Low Freq. LF 30 kHz-300 kHz Medium Freq. MF 300 kHz-3 MHz Ground/Sky wave High Freq. HF 3 MHz-30 MHz Sky wave Very High Freq. VHF 30 MHz-300 MHz Ultra High Freq. UHF 300 MHz-3 GHz Space wave Super High Freq. SHF 3 GHz-30 GHz Extremely High Freq. EHF 30 GHz-300 GHz Tremendously High Freq. THF 300 GHz-3000 GHz
2020/4/23 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 19 Classification Band Initials Frequency Range Characteristics Extremely Low Freq. ELF < 300 Hz Ground wave Infra Low Freq. ILF 300 Hz - 3 kHz Very Low Freq. VLF 3 kHz - 30 kHz Low Freq. LF 30 kHz - 300 kHz Medium Freq. MF 300 kHz - 3 MHz Ground/Sky wave High Freq. HF 3 MHz - 30 MHz Sky wave Very High Freq. VHF 30 MHz - 300 MHz Space wave Ultra High Freq. UHF 300 MHz - 3 GHz Super High Freq. SHF 3 GHz - 30 GHz Extremely High Freq. EHF 30 GHz - 300 GHz Tremendously High Freq. THF 300 GHz - 3000 GHz
N 3)Technique used 国家重点实验室 network Data/Ctrl Main features types Plane It finds wide applications in various levels networking, covering from home,office,LAN,to MAN.The speed c0 uld be1G,10G,100G,200G,400G,800G. The line rates of optical networks are rapidly moving from Ethernet Data 100 Gbps to 200/400 Gbps.Huawei released this 800G module to help operators cope with the bandwidth challenges of 5G networks. SDH/SONET It provides transmission capabilities for different networks, (OTN:optical and is fundamentally and really a physical network since it transport Data performs the function of OSI/PRM# (Open Sys. network, Interconnection/Protocol Reference Model开放系统互连-协 光传送网) is 议参考模型layer one. SDH It carries TDM slot,frames,packets.The highest rate successor(后继 commonly deployed is STM-256 circuit,which operates at 者) rate of just under 40 Gbps.However,its highest rate of STM-1024 with 160G is defined
2020/4/23 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 20 3) Technique used network types Data/Ctrl Plane Main features Ethernet Data It finds wide applications in various levels networking, covering from home, office, LAN, to MAN. The speed could be 1G,10G, 100G, 200G, 400G, 800G. The line rates of optical networks are rapidly moving from 100 Gbps to 200/400 Gbps. Huawei released this 800G module to help operators cope with the bandwidth challenges of 5G networks. SDH/SONET (OTN： optical transport network, 光传送网) is SDH successor(后继 者) Data It provides transmission capabilities for different networks, and is fundamentally and really a physical network since it performs the function of OSI/PRM# (Open Sys. Interconnection/ Protocol Reference Model开放系统互连-协 议参考模型) layer one. It carries TDM slot, frames, packets. The highest rate commonly deployed is STM-256 circuit, which operates at rate of just under 40 Gbps. However, its highest rate of STM-1024 with 160G is defined