G.hn The New ITU-T Home Networking Standard Prepared by: Sophia xie Date: 2009-12-2

Contents G.HN Introduction G.HN network architecture compatible with legacy Networking Tech. Security Bandwidth allocate Format of transmission frame

introduction G.hn (also known as G.9960) is a new standard developed by ITU-T. A unified next generation wired networking technology, operating over all types of in-home wiring (phone line, power line and coaxial cable). Speeds 2x to 5x time faster than todays wired technologies. and bit rates up to 1 Gb/s. (with its default setting G.hn can provide a line data rate over coaxial cable of up to 843.75 Mbps (with actual Ethernet throughput at 762.05 Mbps), and includes optimizations that can support line data rates up to 1.02 Gbit/s [1]) G.hn is intended for small/home offices and public places such as multiple dwelling units, hotels, and conference rooms. [1].中国-广电.有线电视技术网http://www.ccbn.com.cn/html/91/t-91391.html

G.hn core principles introduction Higher throughput and reliability than existing wireline technologies Extended bandwidth, adaptive OFDM, state of the art LDPC code, automatic retransmission, highly efficient MAC Support for multiple home wires ensures 100% coverage Core OFDM engine can be parameterized to optimize performance in each media Security Security architecture based on 802.11i, Point-to-Point AES128 encryption Coexistence with existing technologies, support for dual mode devices International standard Can be deployed in any country, for any home networking application.

ITU-T G.hn design a single PHY/MAC Standard for three different wires introduction ITU-T G.hn design a single PHY/MAC Standard for three different wires G.hn (Sep 2009) G.9960 (Dec 2008)

G.HN NETWORK ARCHITECTURE NOTE: G.hn building home networks by easily bridging to existing technologies The G.hn architecture defines a “domain” as a portion of a G.hn home network where all the devices on a domain can communicate directly with each other at the physical layer. A complete G.hn network is made up of one or more domains, interconnected by IDB’s The most common form of bridging is specified in IEEE 802.1D. When an 802.1D‐compliant bridge receives an Ethernet frame from one domain, it will inspect the frame’s destination address in its MAC header and then forward the frame to the right destination domain

Coexistence with Existing Technologies G.hn networks will need to operate in environments where current wireline technologies are already deployed Coexistence with existing powerline networks will be achieved using G.cx protocol Coexistence with existing coaxial RF technologies will be achieved using frequency agility. Coexistence with DSL will be provieded in a futrue HomeGrid Forum white paper. G.hn allows vendors to implement “dual mode” devices that interoperate with G.hn and with legacy networks.

interoperability interoperation G.hn project’s capable of operating over multiple types of home wiring, including telephone wiring, coaxial cable, powerline wiring, and combinations of these. interoperability between G.hn and existing home networking technologies rely on the ability to bridge packets between heterogeneous networks. Bridges connect to two or more domains or disparate network segments, and enable sending data frames back and forth between them. Different networks to be bridged support a common frame format. G.hn and all existing home networking technologies support Ethernet (802.3) as the common frame format for data transmission.

Interoperability with power line wiring Dual‐mode transceivers implementing G.cx protocol will be able to communicate with G.hn‐only devices and other devices implementing the protocol, all on the same powerline medium. Dual-mode transceivers will operate during both periods in their respective modes, and could act as a bridge between both networks. If a dual‐mode device is configured to operate as a Master for both the G.hn network and the other domain, this device can coordinate transmissions in both networks.

Interoperability with Coax Wiring in RF Band Simultaneous FDM Mode with Bridging In this mode, a device would be capable of simultaneously operating as a G.hn and a MoCA transceiver in different RF channels, and bridge between them. MoCA fallback mode Mixed MoCA and G.hn operation on the same RF channel 802.1D bridging can be used for bridging Ethernet frames between G.hn and any of the existing wired (and wireless) home networking technologies, allowing users to have a single home network composed of multiple heterogeneous segments.

An example of residential HN

New capabilities enabled by G.hn standard Multi-port devices that can select the best communication path between several locations Multi-transceiver devices can transmit data over several networks simultaneously

Security

Pre-flow Allocate Bandwidth

Format of the transmission frame

G.hn is designed to ensure security, reliability and high performance

Reference [1]. “New global standard for fully networked home,” ITU‐T Press Release, http://www.ITUT. int/newsroom/press_releases/2008/36.html [2]. G.hn Issues List, http://q4sg15.ITU‐T.ch/ties/Mtgs09/2009‐03‐Nashville/09NT‐U12.doc [ITU‐Tmembership required] [3].ContributionNC‐47R1, http://ties.ITU‐T.int/u/tsg15/sg15/xchange/wp1/q4/Meetings/2007‐ 04‐NapaValley/NC‐047R1.doc [ITU‐T membership required] [4].Contribution RJ‐61R1, http://ties.ITU‐T.int/u/tsg15/sg15/xchange/wp1/q4/Meetings/2007‐ 10‐RedBank/RJ‐061R1.doc [ITU‐T membership required] [5].Contribution08VS‐027R1,http://ties.ITUT.int/u/tsg15/sg15/xchange/wp1/q4/Meetings/2008‐10‐Valencia/08VS‐027R1.doc [ITU‐T membership required] [6].Contribution08AB‐121R1 ,http://ties.ITUT.int/u/tsg15/sg15/xchange/wp1/q4/Meetings/2008‐06‐Antwerp/08AB‐121R1‐nc.pdf [ITU‐T membership required] [7]. HD‐PLC Alliance, http://www.hd‐plc.org [8]. HomePlug Alliance, http://www.homeplug.org [9]. Universal Powerline Association, http://www.upaplc.org [10]. Multimedia over Coax Alliance, http://www.mocaalliance.org [11]. S. Galli, A. Kurobe, M. Ohura, “The Inter‐PHY Protocol (IPP): A Simple Co‐Existence Protocol,”IEEE International Symposium on Powerline Communications (ISPLC), Dresden, Germany,Mar. 30 – Apr. 1, 2009.

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