M38 数字通信设备 标准查询与下载

YD/T 1440-2006 路由器设备安全测试方法——中低端路由器（基于IPv4）

本标准规定了中低端路由器涉及网络与信息安全方面的测试内容，包括数据转发平面安全测试、路由/控制平面安全测试和管理平面安全测试。 本标准适用于基于IPv4的中低端路由器设备。

Router security test methods--middle/low end router(IPv4)

ITU-T G.767 CORR 1-2006 使用16 kbit/s的预测编码的数字电路倍增设备数字语音插值和传真解调/再调制勘误1

This Recommendation specifies the elements of DCME using 16 kbit/s LD-CELP, Digital Speech Interpolation (DSI) and Facsimile Demodulation/Remodulation in order to achieve interworking of such equipment. It specifies extensions and deviations for ITU-T Recs G.763 and G.766 which specify a 32 kbit/s ADPCM DCME, and Facsimile Demodulation/Remodulation.

Digital circuit multiplication equipment using 16 kbit/s LD-CELP, digital speech interpolation and facsimile demodulation/remodulation Corrigendum 1

ITU-T G.767 CORR 1 FRENCH-2006 使用16 kbit/s的预测编码的数字电路倍增设备数字语音插值和传真解调/再调制勘误1

This Recommendation specifies the elements of DCME using 16 kbit/s LD-CELP, Digital Speech Interpolation (DSI) and Facsimile Demodulation/Remodulation in order to achieve interworking of such equipment. It specifies extensions and deviations for ITU-T Recs G.763 and G.766 which specify a 32 kbit/s ADPCM DCME, and Facsimile Demodulation/Remodulation.

Digital circuit multiplication equipment using 16 kbit/s LD-CELP, digital speech interpolation and facsimile demodulation/remodulation Corrigendum 1

ITU-T G.767 CORR 1 SPANISH-2006 使用16 kbit/s的预测编码的数字电路倍增设备数字语音插值和传真解调/再调制勘误1

This Recommendation specifies the elements of DCME using 16 kbit/s LD-CELP, Digital Speech Interpolation (DSI) and Facsimile Demodulation/Remodulation in order to achieve interworking of such equipment. It specifies extensions and deviations for ITU-T Recs G.763 and G.766 which specify a 32 kbit/s ADPCM DCME, and Facsimile Demodulation/Remodulation.

Digital circuit multiplication equipment using 16 kbit/s LD-CELP, digital speech interpolation and facsimile demodulation/remodulation Corrigendum 1

YD/T 1356-2005 交换机综合业务数字网（ISDN）基本接入速率“U”接口对用户供电要求

本标准规定了具有ISDN功能交换机LT“U”接口对用户侧供电的配置、供电功率、输出电压、输出电流、保护门限和相关的检测方法。 本标准适用于ISDN功能交换机及其相关的NT1、NT1+等网络终端设备、ISDN终端设备和需要网络侧（局端）远供电的基本速率数字传输系统。 本标准也可以作为使用金属本地线路ISDN数字传输系统远供电要求的依据。 本标准规定的供电参数是依据我国用户线路系统（见本标准3.1 c））提出的，但不排出其间介入再生中继器的应用方式。 对于受电设备或系统对自交换机LT“U”接口获取电能使用量值的分配本标准不做规定。

The specification for user power feeding of ISDN basic access U interface on the switch

ITU-T G.722.2 NOTE-2004 使用自适应多速率宽带（AMR-WB）对大约 16 kbit/s 的语音进行宽带编码 G 系列：传输系统和媒体、数字系统和网络 数字终端设备 通过 PCM 以外的方法对模拟信号进行编码（研究

This Recommendation describes the high quality Adaptive Multi-rate Wideband (AMR-WB) encoder and decoder that is primarily intended for 7 kHz bandwidth speech signals. AMR-WB operates at a multitude of bit rates ranging fi-om 6.6 kbith to 23.85 kbith. The bit rate may be changed at any 20 ms fi-ameboundary.

Wideband coding of speech at around 16 kbit/s using Adaptive Multi-rate Wideband (AMR-WB) - SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS - Digital terminal equipments - Coding of analogue signals by methods other than PCM (Study

ITU-R INFORME M.2050 SPANISH-2004 测试结果表明海上无线电导航雷达对在2900-3100和9200-9500MHz频段上数字通信和脉冲系统的散发物具有易感性

Tests have been performed to assess the effects that emissions from digital communication systems have on three maritime radionavigation radars that operate with a primary allocation in the 2 900-3 100 MHz band and two radars that operate with primary allocation in the 9 200-9 500 MHz band. The radars were International Maritime Organization (IMO) SOLAS1compulsory carriage category maritime radionavigation radars that employ scan rates, pulse widths, PRFs, IF bandwidth, noise figure, and antenna beamwidths typical of those identified in Recommendation ITU-R M.1313. These radars are representative of the types being used by the United States Coast Guard for shipboard navigation, by the commercial shipping industry, and recreational boaters as well. The radars operating in the 2 900-3 100 MHz band are identified as Radars A, B and C in this Report and the 9 200-9 500 MHz radars are identified as Radars D and E.

Test results illustrating the susceptibility of maritime radionavigation radars to emissions from digital communication and pulsed systems in the bands 2 900-3 100 and 9 200-9 500 MHz

ITU-R REPORT SM.2022-1-2004 其它调制方案对数字通信系统的干扰影响

This Part A considers the situation where a digital fixed link receives interference from radio (natural) noise plus an unwanted interferer of power set at 6 dB above the natural noise. Current fixed link assignment strategies are commonly noise limited. This means that the minimum receiver signal level under fading is set to a particular level with respect to the system noise floor and the ambient noise. The assignments are then planned such that the maximum level of an unwanted signal is set by a protection ratio that results in the unwanted signals typically being approximately 6 dB below the noise. This approach is relatively safe and easy to define, but suffers from being sub-optimum. It is advantageous in maximizing the number of links that can be accommodated in a given band and geographical area to arrange that systems are interference limited. In other words, that the unwanted signals, not natural noise, set the environmental noise floor. Such a strategy brings forth the need to assess the performance of fixed-link receivers in the presence of unwanted signals of other modulation schemes as well as Gaussian noise.

The effect on digital communications systems of interference from other modulation schemes

ITU-T G.726 ANX B-2003 403224 16 kbit/s自适应差分脉码调制.附件B.数据包格式功能识别器和H.245信号的性能参数系列G:传动系统和媒体数字系统和网络数字终端设备.脉码调制以外模拟信号的编码方法研究组16

This annex specifies the packet structure for the carriage of G.726 audio, along with the capability identifier and parameters for H.245, in order to use G.726 between multimedia communication systems that utilize H.245.

40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) Annex B. Packet format, capability indentifier and capability parameters for H.245 signalling SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal

ITU-T G.726 ANX B SPANISH-2003 403224 16 kbit/s自适应差分脉码调制.附件B.数据包格式功能识别器和H.245信号的性能参数系列G:传动系统和媒体数字系统和网络数字终端设备.脉码调制以外模拟信号的编码方法研究组16

This annex specifies the packet structure for the carriage of G.726 audio, along with the capability identifier and parameters for H.245, in order to use G.726 between multimedia communication systems that utilize H.245.

40, 32, 24, 16 kbit/s ADAPTIVE DIFFERENTIAL PULSE CODE MODULATION (ADPCM) ANNEX A: EXTENSIONS OF RECOMMENDATION G.726 FOR USE WITH UNIFORM-QUANTIZED INPUT AND OUTPUT

ITU-T G.726 ANX B FRENCH-2003 403224 16 kbit/s自适应差分脉码调制.附件B.数据包格式功能识别器和H.245信号的性能参数系列G:传动系统和媒体数字系统和网络数字终端设备.脉码调制以外模拟信号的编码方法研究组16

This annex specifies the packet structure for the carriage of G.726 audio, along with the capability identifier and parameters for H.245, in order to use G.726 between multimedia communication systems that utilize H.245.

40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) Annex B: Packet format, capability identifier and capability parameters for H.245 signalling

YD/T 1275-2003 N×64bit/s基带调制解调器技术要求和测试方法

本标准规定了基带调制解调器的接口电气性能、线路传输性能、安全性能、电力线防护性能、环境 适应性、设备防雷性能及电磁兼容性等检验技术要求和测试方法。 本标准适用于采用 2BI1Q、PAM 等调制方式、在普通电话双绞线两线专线上、双向对称传输 Wx 64kbit/s 速率数据信号的调制解调设备。

Technical specification and testing method for N×64bit/s baseband modem

ITU-R SA.1276-1-2003 为避免受25.25-27.5GHz频段固定业务系统发射的影响数据中继卫星的轨道定位

The expanded use and the increased number of charge cards require Card Issuers (or authorized agents) to implement adequate security against fraudulent use. Therefore, a critical facet in the provision of such a system is the ability to ensure the validit

Orbital locations of data relay satellites to be protected from the emissions of fixed service systems operating in the band 25.25-27.5 GHz Question ITU-R 118/7

DLA MIL-HDBK-62 CHG NOTICE 1-2002 VHDL数字电子系统文件

The goals, scope, and intended audience of the handbook are described in this chapter. Included are references to industry standardization efforts related to the goals of this handbook. Also provided is an overview of each chapter of the handbook.

DOCUMENTATION OF DIGITAL ELECTRONIC SYSTEMS WITH VHDL

ITU-T M.2301 FRENCH-2002 基于IP网络的连接提供和维护用性能目标和程序.M系列:电信管理网(TMN)和网络维护:国际传输系统,电话机电路,电报,传真和租用电路.国际传输网络.4号研究组

This Recommendation provides performance objectives and procedures for provisioning and maintenance of IP-based networks. It focuses attention on parameters that significantly affect the quality of service perceived by the customer, and the methods of measuring those parameters. These include those parameters that affect delay performance at the application layer. Performance limits for temporary dial-up access links, end-customer owned portions and MPLS networks are not covered by this Recommendation and are for further study. However, the performance of fixed access links, whose routing does not change, is covered.

Performance objectives and procedures for provisioning and maintenance of IP-based networks

ITU-T M.2301 SPANISH-2002 基于IP网络的连接提供和维护用性能目标和程序.M系列:电信管理网(TMN)和网络维护:国际传输系统,电话机电路,电报,传真和租用电路.国际传输网络.4号研究组

This Recommendation provides performance objectives and procedures for provisioning and maintenance of IP-based networks. It focuses attention on parameters that significantly affect the quality of service perceived by the customer, and the methods of measuring those parameters. These include those parameters that affect delay performance at the application layer. Performance limits for temporary dial-up access links, end-customer owned portions and MPLS networks are not covered by this Recommendation and are for further study. However, the performance of fixed access links, whose routing does not change, is covered.

Performance objectives and procedures for provisioning and maintenance of IP-based networks

ITU-T O.150 CORR 1 FRENCH-2002 数字传输设备性能测量仪器的一般要求.勘误表1.4号研究组

Defines the requirements for an equipment to measure error performance of digital systems at the hierarchical bit rates between 1.5 and 140 Mbit/s.

General Requirements for Instrumentation for Performance Measurements on Digital Transmission Equipment Corrigendum 1 Study Group 4

ITU-T O.150 CORR 1 SPANISH-2002 数字传输设备性能测量仪器的一般要求.勘误表1.4号研究组

Defines the requirements for an equipment to measure error performance of digital systems at the hierarchical bit rates between 1.5 and 140 Mbit/s.

General Requirements for Instrumentation for Performance Measurements on Digital Transmission Equipment Corrigendum 1 Study Group 4

ITU-T H.262 NOTE-2002 内容描述数据研究组16

This amendment provides an ability to send supplemental "content description data"within H.262 video elementary streams.The content description data that can be carried includes picture capture timing information,additional pan-scan parameters,an indication of the visual active region within the video picture,and a coded representation of the picture size in bytes.

Content description data (Study Group 16)

ITU-R SM.1600-2002 数字信号的技术鉴定

that the use of radio grows steadily; b) that digital signals are being widely used; c) that an increasingly large number of devices can be used without benefit of a licence or certification process, preventing any administration to identify their emiss

Technical identification of digital signals