M38 数字通信设备 标准查询与下载

DB51/T 2048-2015 液晶显示器增亮光学膜片

本标准规定了液晶电视增亮光学功能膜片的定义、结构形状、要求、试验方法、检验规则及标志、包装、运输、贮存等。 本标准适用于液晶显示器中的背光模组光学材料。

Brightness enhancing optical film for liquid crystal display

ITU-T G.7041 AMD 3-2015 通用成帧规程修改件3(研究组15)

Amendment 3 to Recommendation ITU-T G.7041/Y.1303 (2011) adds payload types and mapping descriptions associated with generic framing procedure (GFP) encapsulation of two types of synchronization messages.

Generic Framing Procedure (GFP) Amendment 3 (Study Group 15)

ITU-R M.1827-1-2015 表面在机场的应用频率为5091-5150 MHz区间的航空移动(R)服务站技术和操作要求准则

This Recommendation provides technical and operational requirements for stations of the aeronautical mobile(route) service (AM(R)S) limited to surface applications at airports in the frequency band 5 091-5 150 MHzthat should be used by administrations as a technical guideline for establishing conformance requirements forstations for worldwide use.

Guideline on technical and operational requirements for stations of the aeronautical mobile (R) service limited to surface application at airports in the frequency band 5 091-5 150 MHz

ITU-T H.785.0-2014 数字标牌:灾害信息服务的要求(研究组16)

Digital signage: Requirements for disaster information services (Study Group 16)

ITU-T J.205 CORR 2-2014 使用集成广播和宽带数字电视应用控制架构要求.勘误表2(研究组9)

This Recommendation defines the downstream radio frequency interface (DRFI) specifications for:?an edgeQAM (EQAM) modular device; or?an integrated cable modem termination system (CMTS) with multiple downstream channels per RF port;or? an integrated CMTS beyond DOCSIS 2.0.

Requirements for an application control framework using integrated broadcast and broadband digital television Corrigendum 2 (Study Group 9)

ITU-T G.728 NOTE-2014 16 kbit/s语音编码使用低延迟的代码唤起的线性预测(研究组16)

The codevector components associated to channel index 36 and channel index 42 contain wrong signs.

Coding of speech at 16 kbit/s using low-delay code excited linear prediction (Study Group 16)

ITU-T H.460.7-2013 ITU-T H.323系统中的数字地图.16号研究组

This Recommendation defines the usage of Digit Maps within ITU-T H.323 systems. Digit Maps can improve the post dial delay experienced by the user and can reduce the amount of provisioning that would otherwise have to occur in order to reduce such delays.

Digit maps within ITU-T H.323 systems (Study Group 16)

ITU-T G.722-2012 64 kbit/s内的7 KHz音频编码研究组16[作废:ITU-T G.722 应用3 西班牙语 ITU-T G.722 附件 A西班牙语ITU-T G.722西班牙语ITU-T G.722应用2 西班牙语ITU-T G.722应用3 法语 ITU-T G.722 附件 A法语ITU-T G.722 FRENCH ITU-T G.722应用2法语]

This Recommendation describes the characteristics of an audio (50 to 7 000 Hz) coding system which may be used for a variety of higher quality speech applications.

7 kHz audio-coding within 64 kbit/s (Study Group 16)

ITU-T G.7041 AMD 1-2012 通用成帧规程修改件1(研究组15)

Amendment 1 to Recommendation ITU-T G.7041/Y.1303 (2011) specifies the not-operational primitive sequence (NOS) as the preferred replacement signal for both the single-byte command code sets connection/enterprise systems connection (SBCON/ESCON) and fibre channel signals in optical transport network (OTN) mapping.

Generic framing procedure Amendment 1 (Study Group 15)

ITU-T O.175-2012 基于XG-PON的数字系统抖动测量设备.15号研究组

The test instrumentation consists principally of a jitter measurement function and a jitter generation function. Measurements can be performed at the physical layer of XG-PON systems. A bit-error rate test set may also be required for certain types of measurements; this may be part of the same instrumentation or it may be physically separate. Test instrumentation for the generation and measurement of jitter in digital systems based on Synchronous Digital Hierarchy (SDH) is specified in ITU-T Rec. O.172. It is recommended that ITU-T Rec G.987.2 should be read in conjunction with this Recommendation.

Jitter measuring equipment for digital systems based on XG-PON (Study Group 15)

YD/T 2253-2011 软交换网络通信安全

本标准规定了软交换网络通信安全模型，解决网络域、接入域、业务域以及不同网络域之间的通信安全，包括认证、密钥的分配与管理、安全能力协商、安全联盟的建立、以及在软交换网络中的实际应用，包括应用层敏感信息安全、媒体流安全，确保软交换网络实体之间的互通。 本标准适用于固定软交换网络。

Communication security specification of soft switch-based network

YD/T 2310-2011 通信用多用途音频编解码

本标准规定了用于通信业务的多用途音频编解码技术方案，包括分层编解码的各层功能描述和各层模块描述、多码率编解码的功能描述和模块描述，以及码流的存储和传输格式。本标准适用于IPTV、视频会议、视频监控、网络流媒体等各种通信业务。

Versatile audio codec for telecommunications

ITU-T O.172 AMD 2-2010 基于同步数字序列(SDH)数字系统的抖动和漂移测量设备.修改件2:STM-256参考发射器固有抖动的可替代时钟,抖动生成和新验证法.15号研究组

Amendment 2 to Recommendation ITU-T O.172 contains an alternative implementation of clock and jitter generation for Appendix VII and a new verification method for the reference transmitter intrinsic jitter for STM-256, as Appendix IX.

Jitter and wander measuring equipment for digital systems which are based on the synchronous digital hierarchy (SDH) Amendment 2: Alternative clock and jitter generation and a new verification method for STM-256 reference transmitter intrinsic jitter (Stu

ITU-R M.493-13 SPANISH-2009 海上移动通信业务中数字选择呼叫设备

This Recommendation describes the digital selective-calling (DSC) system for use in the maritime mobile service covering general purpose and simplified versions of DSC equipment. A description of a generalized user interface as well as an automated procedure for the operation of shipborne equipment are also included.

Digital selective-calling system for use in the maritime mobile service

ITU-R M.493-13 FRENCH-2009 海上移动通信业务中数字选择呼叫设备

This Recommendation describes the digital selective-calling (DSC) system for use in the maritime mobile service covering general purpose and simplified versions of DSC equipment. A description of a generalized user interface as well as an automated procedure for the operation of shipborne equipment are also included.

Digital selective-calling system for use in the maritime mobile service

SJ 20967-2007 数字消息传送设备子系统互操作性

本标准规定了数字消息传送设备子系统互操作性及与数字消息传送设备交换信息的指挥自动化系统的规程、协议和参数，并对战术互联网网间和网内的各数字消息传送设备之间、各指挥自动化系统之间、以及数字消息传送设备和指挥自动化系统之间信息交换的通信协议和规程作了规定。 本标准适用于战术互联网数字消息传送设备的论证、设计、研制、试验和生产。

Subsystem interoperability of the digital message transfer device

GJB 5933-2007 军用搬移式同步数字传送网设备规范

本规范规定了军用搬移式同步数字传送网设备（以下简称传送网设备）的技术要求、检验方法和质量保证规定。 本规范适用于传送网设备的设计、研制、制造、采购、检验验收和使用。同类设备也可参照使用。

Specification for military conveyable synchronous digital hierachy transport network equipment

TIA-127-C-2007 增强型可变速率编码器,宽带扩频数字系统的语音业务选择3、68和70

These technical requirements form a standard for Service Options 3, 68, and 70, enhanced variable rate, two way speech service options known as EVRC-A, EVRC-B, and EVRC-WB respectively. These service options communicate at one of four channel rates corr

Enhanced Variable Rate Codec, Speech Service Options 3, 68, and 70 for Wideband Spread Spectrum Digital Systems Includes Access to Additional Content

ITU-R QUESTION 46-3/4-2007 卫星固定业务中优先多址接入特点

The ITU Radiocommunication Assembly considering a) that satellites in the fixed-satellite service (FSS) are simultaneously used by many earth stations at different locations; b) that various multiple-access methods including time division multiple-access (TDMA) and code division multiple-access (CDMA) are already used or planned by various administrations; c) that multicarrier-based multiple-access schemes such as orthogonal frequency division multiplexing –frequency division multiple-access (OFDM-FDMA or OFDMA), multicarrier CDMA (MC-CDMA) and multifrequency TDMA (MF-TDMA) have been adopted or are being considered to be adopted in many terrestrial system standards for future implementation; d) that, in order to ensure the efficient use of frequency spectrum and orbits, it may be desirable to determine the optimum multiple-access characteristics; e) that recommendation of certain system characteristics may be desirable; f) that the transmission characteristics of multiple-access systems, especially multicarrier-based multiple-access systems, may be of importance in their interaction with one another; g) that increases in interference on CDMA signals can be accommodated by reducing system capacity.

Preferred multiple-access characteristics in the fixed-satellite service

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)