Nessum
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Nessumis a communication technology standardized by the Institute of Electrical and Electronics Engineers (IEEE). It is standardized asIEEE 1901-2020.[1][2][3] The standard is to be used to communicate data over wired andwirelessmedia using high frequencies between ~500kHz and ~56 MHz bands. TheNessum Allianceis the certifying body for compatibility between Nessum-based communication devices.
Overview
[edit]Nessum offers two types of communication: wired (Nessum WIRE) and wireless (Nessum AIR).[4]
Wired communication
[edit]Nessum WIRE can be used for various types of wires such aspower lines,twisted pairwiring,coaxial cables,andtelephone lines.The communication distance can range between tens of meters to several kilometers depending on the use case.[5][6]In addition, when an automatic relay function called multi-hop (ITU-T G.9905) is utilized, a maximum of 10 stages of relay is possible to extend the range, and support various network topologies (Ring,Star,Bus,MESH). With a maximum physical speed of 1 Gbps and effective throughput ranging from several Mbps to several hundred Mbps, this technology is used to reduce network construction costs and complexity by utilizing the existing lines or dedicated lines[7].
Wireless communication
[edit]Nessum wireless communication is called Nessum AIR. It uses magnetic field communication for short range communication. The communication distance can be controlled in the range of a few centimeters to 100 centimeters. Maximum physical speed is 1 Gbps, with an effective speed of 100 Mbps.[8]
Technical overview
[edit]Physical layer (PHY)
[edit]Thephysical layeruses WaveletOFDM(Wavelet Orthogonal Frequency Division Multiplexing), while a guard interval is required in ordinary OFDM systems. The WaveletOFDMsystem eliminates the guard interval and increases the occupancy rate of the data portion, thereby achieving high efficiency. In addition, due to the bandwidth limitation of each subcarrier, the level of sidelobes is set low, which facilitates the formation of spectral notches. This minimizes interference with existing systems and allows for flexible compliance with frequency utilization regulations. Furthermore,Pulse-Amplitude Modulation(PAM) is used for each subcarrier, and the optimal number of modulation multi-levels is set according to the conditions of the transmission path, thereby improving transmission efficiency.[9]The frequency band used can be selected from among standardized patterns.[10]
Data link layer (MAC)
[edit]Thedata link layermanagesquality of serviceand other control functions using control frames "beacons" broadcast periodically by the parent to all terminals in the network. The basic media access methods are Carrier-Sense Multiple Access with Collision Avoidance (CSMA/CA) and Dynamic Virtual Token Passing (DVTP), which dynamically assign transmission rights to terminals in the network and avoid collisions, The system uses a collision avoidance mechanism.[11]
Nessum Alliance
[edit]Nessum Alliance was established in September 2007 as a voluntary association, originally under the name of "HD-PLC Alliance". In October 2023, the HD-PLC Alliance was renamed the Nessum Alliance.[12]
Nessum Alliance is a certifying body for compatibility between communication devices that comply with the international standard IEEE 1901-2020. Associated organisations are the JapaneseTelecommunication Technology Committee(TTC) The TaiwaneseIndustrial Technology Research Instituteand theIEEE Standards Association.
History
[edit]This technology is based onHD-PLC,a type ofpower line communicationdeveloped byPanasonicin the early 2000s. HD-PLC was developed for room-to-room transmission of audio and video data at the time, but later began to be used not only for power lines but also for coaxial lines and twisted pair lines, and even for wireless communication. The name "power line communication" did not match the reality of the situation. In September 2023, Panasonic Holdings Corporation changed the name of HD-PLC to Nessum.[3]
See also
[edit]References
[edit]- ^"IEEE 1901 Working Group".IEEE SA.Retrieved2023-10-13.
- ^"IEEE P1901c Standard for Broadband over Power Line Networks: Medium Access Control and Physical Layer Specifications Amendment 3: Enhanced Flexible Channel Wavelet (FCW) physical and media access control layers for use on any media".IEEE SA.Retrieved2023-10-13.
- ^ab"Panasonic Holdings' Technology Approved as a Technology Draft Standard for IEEE's Next-generation Communication Standard:Accelerating Global Development with a New Brand Name, Nessum".Panasonic Holdings Corporation.Retrieved2023-10-13.
- ^"Nessum IP core".Panasonic Holdings Corporation.Retrieved2023-10-20.
- ^"PLINE điện lực tuyến thông tín タイプ".Toho Technology Corporation.Retrieved2023-10-13.
- ^"Coaxial LAN converter".i-PRO.3 September 2021.Retrieved2023-10-20.
- ^"Nạp nhập sự lệ danh cổ ốc đại học インターナショナル・レジデンス đông sơn".Panasonic Corporation.Retrieved2023-10-13.
- ^"What is Nessum?".Nessum Alliance.Retrieved2023-10-20.
- ^"Nessum Technical Overview, Nessm PHY layer".Nessum Alliance.Retrieved2023-10-20.
- ^"Nessum Latest Technology, Modes and channels".Nessum Alliance.Retrieved2023-10-20.
- ^"Nessum Technical Overview, Nessum MAC layer".Nessum Alliance.Retrieved2023-10-20.
- ^""HD-PLC Alliance" is renamed "Nessum Alliance" as it enters a New Era of Wired and Wireless (Any Media) IoT Communication Applications! ".businesswire(Press release). 4 October 2023.Retrieved2023-10-13.