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ITU-T G.992.4 (07/2002)
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ITU-T G.992.4 (07/2002)
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无分离器的第二代不对称数字用户线收发信机(无分离器的ADSL2)
本建议书描述了电信网络与用户装置之间接口的相互作用和电气特性。G.992.4实现了POTS和V系列数据服务通过单混规双绞线上的数字信道进行实时传输。在TCM-ISDN噪音环境中的操作还有待进一步研究。本建议书是作为ITU-T G.992.3建议书的增量文件来组织架构的。本建议书包括为实现无需“分离器”供应的程序,“分离器”通常安装在用户驻地的入口处。此外,规定了旨在降低功耗的中央办公室和用户驻地的电源管理程序和链接状态。本建议书描述了基于第一代ITU-T G.992.2建议书的第二代无分离器ADSL。经以下几大补充和修订,本建议书可以很容易地在支持G.992.4和G.992.2的多模设备中实施:
• 改进的应用程序支持全数字操作模式和ADSL语音操作。
• 除了现有的ATM支持外,新的数据包TPS-TC功能和STM TPS-TC功能。
• 支持ATM TPS-TC中的IMA。
• 对每个TPS-TC配置能力的改进,可以对延迟、误码率和最小、最大与保持数据传输速率进行配置。
• 对成功和不成功的初始化情况新的线路诊断程序。
• 增强了在线重配置功能,包括比特交换,动态速率重新分配,无缝速率适配。
• 更灵活的TPS-TC功能,包括支持最多4个帧承载信道,4个延时路径,以及增强型配置的开销信道的控制参数。
• 性能改进,包括必须支持R = 16,1位星座图,格状编码。
• 更强大的初始化过程,包括分离器功能特性G.992.2快速重新训练程序,CO和CP控制的自适应信号持续,接收器确定数据交换自适应调频,以及一个可选的自适应长度快速启动程序。
• 改进了RFI和频谱管理工具,包括线路两端发射功率下降、频谱整形、避免RFI的子载波中断名单,和改进的子载波排序,以帮助减轻从子载波到子载波的RFI传播。
• 省电功能,包括强制降低管理层控制下的超额极限,一个新的L2电源管理链路状态与中央办公室的低功耗特性。来源: ITU-T G.992.4建议书由ITU-T第15研究组(2001 - 2004年)起草,并于2002年7月29日按照世界电信标准化全会(WTSA)第1号决议规定的程序批准。
Citation:
https://handle.itu.int/11.1002/1000/6117
Series title:
G series: Transmission systems and media, digital systems and networks
G.900-G.999: Digital sections and digital line system
G.990-G.999: Metallic access networks
Approval date:
2002-07-29
Provisional name:
G.lite.bis, G.lite.x
Approval process:
AAP
Status:
In force
Maintenance responsibility:
ITU-T Study Group 15
Further details:
Patent statement(s)
Development history
Editions
Related Supplement(s)
Related technical papers and reports
Ed.
ITU-T Recommendation
Status
Summary
Table of Contents
Download
1
G.992.4 (07/2002)
In force
here
here
here
ITU-T Supplement
Title
Status
Summary
Table of contents
Download
G Suppl. 4 (12/1972)
Certain methods of avoiding the transmission of excessive noise between interconnected systems
In force
-
-
here
G Suppl. 5 (10/1984)
Measurement of the load of telephone circuits under field conditions
In force
-
-
here
G Suppl. 7 (12/1972)
Loss-frequency response of channel-translating equipment used in some countries for international circuits
In force
here
here
here
G Suppl. 8 (12/1972)
Method proposed by the Belgian telephone administration for interconnection between coaxial and symmetric pair systems
In force
-
-
here
G Suppl. 17 (10/1984)
Group-delay distortion performance of terminal equipment
In force
-
-
here
G Suppl. 19 (10/1984)
Digital crosstalk measurement (method used by the Administrations of France, the Netherlands and Spain)
In force
-
-
here
G Suppl. 22 (10/1984)
Mathematical models of multiplex signals
In force
-
-
here
G Suppl. 26 (10/1984)
Estimating the signal load margin of FDM wideband amplifier equipment and transmission systems
In force
-
-
here
G Suppl. 27 (10/1984)
Interference from external sources
In force
-
-
here
G Suppl. 28 (10/1984)
Application of transmultiplexers, FDM codecs, data-in-voice (DIV) systems and data-over-voice (DOV) systems during the transition from an analogue to a digital network
In force
-
-
here
G Suppl. 32 (11/1988)
Transfer of alarm information on 60-channel transmultiplexing equipment
In force
-
-
here
G Suppl. 34 (11/1988)
Temperature in underground containers for the installation of repeaters
In force
-
-
here
G Suppl. 35 (11/1988)
Guidelines concerning the measurement of wander
In force
-
-
here
G Suppl. 36 (11/1988)
Jitter and wander accumulation in digital networks
In force
-
-
here
G Suppl. 39 (02/2016)
Optical system design and engineering considerations
In force
here
here
here
G Suppl. 40 (07/2024)
Optical fibre and cable Recommendations and standards guideline
In force
here
-
here
G Suppl. 41 (07/2024)
Design guidelines for optical fibre submarine cable systems
In force
here
-
here
G Suppl. 42 (10/2018)
Guide on the use of the ITU-T Recommendations related to optical fibres and systems technology
In force
here
here
here
G Suppl. 43 (02/2011)
Transport of IEEE 10GBASE-R in optical transport networks (OTN)
In force
here
here
here
G Suppl. 44 (06/2007)
Test plan to verify B-PON interoperability
In force
here
here
here
G Suppl. 45 (09/2022)
Power conservation in optical access systems
In force
here
here
here
G Suppl. 46 (05/2009)
G-PON interoperability test plan between optical line terminations and optical network units
In force
here
here
here
G Suppl. 47 (09/2012)
General aspects of optical fibres and cables
In force
here
here
here
G Suppl. 48 (06/2010)
10-Gigabit-capable passive optical networks: Interface between media access control with serializer/deserializer and physical medium dependent sublayers
In force
here
here
here
G Suppl. 49 (09/2020)
Rogue optical network unit (ONU) considerations
In force
here
here
here
G Suppl. 50 (09/2011)
Overview of digital subscriber line Recommendations
In force
here
here
here
G Suppl. 51 (06/2017)
Passive optical network protection considerations
In force
here
here
here
G Suppl. 52 (09/2012)
Ethernet ring protection switching
In force
here
here
here
G Suppl. 53 (12/2014)
Guidance for Ethernet OAM performance monitoring
In force
here
here
here
G Suppl. 54 (07/2015)
Ethernet linear protection switching
In force
here
here
here
G Suppl. 55 (12/2023)
Radio-over-fibre (RoF) technologies and their applications
In force
here
here
here
G Suppl. 56 (02/2016)
OTN transport of CPRI signals
In force
here
here
here
G Suppl. 57 (07/2015)
Smart home profiles for 6LoWPAN devices
In force
here
here
here
G Suppl. 59 (02/2018)
Guidance on optical fibre and cable reliability
In force
here
here
here
G Suppl. 60 (09/2016)
Ethernet linear protection switching with dual node interconnection
In force
here
here
here
G Suppl. 62 (02/2018)
Gfast certification
In force
here
here
here
G Suppl. 64 (02/2018)
PON transmission technologies above 10 Gb/s per wavelength
In force
here
here
here
G Suppl. 65 (10/2018)
Simulations of transport of time over packet networks
In force
here
here
here
G Suppl. 66 (09/2020)
5G wireless fronthaul requirements in a passive optical network context
In force
here
here
here
G Suppl. 67 (07/2019)
Application of optical transport network Recommendations to 5G transport
In force
here
here
here
G Suppl. 68 (12/2023)
Synchronization operations, administration and maintenance requirements
In force
here
here
here
G Suppl. 69 (09/2020)
Migration of a pre-standard network to a metro transport network
In force
here
here
here
G Suppl. 70 (09/2020)
Supplement on sub 1 Gbit/s services transport over optical transport network
In force
here
here
here
G Suppl. 71 (12/2023)
Optical line termination capabilities for supporting cooperative dynamic bandwidth assignment
In force
here
here
here
G Suppl. 72 (04/2021)
Modelling consideration for optical media networks
In force
here
here
here
G Suppl. 73 (10/2021)
Influencing factors on quality of experience for multiview video (MVV) services
In force
here
here
here
G Suppl. 74 (12/2021)
Network slicing in a passive optical network context
In force
here
here
here
G Suppl. 75 (12/2021)
5G small cell backhaul/midhaul over TDM-PON
In force
here
here
here
G Suppl. 76 (12/2021)
Optical transport network security
In force
here
here
here
G Suppl. 77 (06/2022)
Supplement 77 to ITU-T G-series of Recommendations - Influencing factors on quality of experience (QoE) for video customized alerting tone (CAT) and video customized ringing signal (CRS) services
In force
here
here
here
G Suppl. 78 (09/2022)
Use case and requirements of fibre-to-the-room for small business applications
In force
here
here
here
G Suppl. 79 (12/2023)
Latency control and deterministic capability over a PON system
In force
here
here
here
G Suppl. 80 (07/2024)
Use case and requirements of fibre-based in-premises networking for home application (FIP4H)
In force
here
-
here
G Suppl. 81 (07/2024)
Practical aspects of PON security
In force
here
-
here
G Suppl. 82 (07/2024)
Enhanced optical line termination with information technology functions
In force
here
-
here
G Suppl. 83 (07/2024)
Supplement on the use of options in PTP profile with full timing support from the network
In force
here
-
here
Title
Approved on
Download
Roadmap for QoS and QoE in the ITU-T Study Group 12 context (TR-RQ)
2023
here
Considerations on the use of GNSS as a primary time reference in telecommunications
2020
here
Use of G.hn in industrial applications
2020
here
DSL story
2010
here
ISDN field trial guidelines
1991
here
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