M15;M42 标准查询与下载

ITU-R F.1668-1 SPANISH-2007 用于27500 km假想参考路径和连接的实际数字固定无线链路的误码性能目标

This Recommendation provides updated information on error-performance objectives for real digital fixed wireless links used in 27 500 km hypothetical reference paths and connections. It is the only Recommendation defining error-performance objectives for all real digital fixed wireless links. Performance events and objectives for connections using equipment designed prior to approval of ITU-T Recommendation G.826 in December 2002 are given in ITU-T Recommendation G.821 and Recommendations ITU-R F.634, ITU-R F.696 and ITU-R F.697. Recommendations ITU-R F.1397 and ITU-R F.1491 are superseded by this Recommendation. Example of a connection, path, link and hop are given in Annex 1. Definitions of the error performance events, derived from ITU-T Recommendations G.826 and G.828, are given in Annex 2. Examples of calculations of the error performance parameters are given in Annex 3.

Error performance objectives for real digital fixed wireless links used in 27 500 km hypothetical reference paths and connections

ITU-R F.1668-1 FRENCH-2007 用于27500 km假想参考路径和连接的实际数字固定无线链路的误码性能目标

This Recommendation provides updated information on error-performance objectives for real digital fixed wireless links used in 27 500 km hypothetical reference paths and connections. It is the only Recommendation defining error-performance objectives for all real digital fixed wireless links. Performance events and objectives for connections using equipment designed prior to approval of ITU-T Recommendation G.826 in December 2002 are given in ITU-T Recommendation G.821 and Recommendations ITU-R F.634, ITU-R F.696 and ITU-R F.697. Recommendations ITU-R F.1397 and ITU-R F.1491 are superseded by this Recommendation. Example of a connection, path, link and hop are given in Annex 1. Definitions of the error performance events, derived from ITU-T Recommendations G.826 and G.828, are given in Annex 2. Examples of calculations of the error performance parameters are given in Annex 3.

Error performance objectives for real digital fixed wireless links used in 27 500 km hypothetical reference paths and connections

ITU-R M.1230 SPANISH-1997 运行于137 MHz-138 MHz频段非同步卫星移动卫星业务的空对地链路的性能目标

The performance objectives for downlinks of FDMA non-geostationary-satellite orbit (GSO) mobile-satellite service (MSS) networks and spread spectrum multiple access (SSMA) non-GSO MSS networks are stipulated in this Recommendation.

PERFORMANCE OBJECTIVES FOR SPACE-TO-EARTH LINKS OPERATING IN THE MOBILE-SATELLITE SERVICE WITH NON-GEOSTATIONARY SATELLITES IN THE 137-138 MHz BAND

ITU-R M.1230 FRENCH-1997 运行于137 MHz-138 MHz频段非同步卫星移动卫星业务的空对地链路的性能目标

The performance objectives for downlinks of FDMA non-geostationary-satellite orbit (GSO) mobile-satellite service (MSS) networks and spread spectrum multiple access (SSMA) non-GSO MSS networks are stipulated in this Recommendation.

Performance Objectives for Space-to-Earth Links Operating in the Mobile-Satellite Service with Non-Geostationary Satellites in the 137-138 MHz Bands

ITU-T P.84 SPANISH-1993 评价数字电路倍增和分组化语音系统的主观听力测试方法.电话传输质量.主观意见的测试(12号研究组)22pp

The purpose of this Recommendation is to describe a subjective listening test method which can be used to evaluate the speech quality of Digital Circuit Multiplication Equipment (DCME) or packetized voice systems. This Recommendation is intended for use with DCME systems, such as those described in Recommendation G.763, which use digital speech interpolation (DSI) techniques. For subjective test evaluations of DCME systems not using digital speech interpolation techniques, described in Recommendation G.726 [40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)], use Recommendation P.83.

SUBJECTIVE LISTENING TEST METHOD FOR EVALUATING DIGITAL CIRCUIT MULTIPLICATION AND PACKETIZED VOICE SYSTEMS

ITU-T P.84 FRENCH-1993 评价数字电路倍增和分组化语音系统的主观听力测试方法.电话传输质量.主观意见的测试(12号研究组)22pp

The purpose of this Recommendation is to describe a subjective listening test method which can be used to evaluate the speech quality of Digital Circuit Multiplication Equipment (DCME) or packetized voice systems. This Recommendation is intended for use with DCME systems, such as those described in Recommendation G.763, which use digital speech interpolation (DSI) techniques. For subjective test evaluations of DCME systems not using digital speech interpolation techniques, described in Recommendation G.726 [40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)], use Recommendation P.83.

SUBJECTIVE LISTENING TEST METHOD FOR EVALUATING DIGITAL CIRCUIT MULTIPLICATION AND PACKETIZED VOICE SYSTEMS

ITU-T M.110 FRENCH-1988 电路测试

Access points are required to enable lining-up and subsequent maintenance operations to be performed on international circuits. The required access points are as follows:1.1 Recommendation M.565 describes and defines the access points needed for international public telephone circuits, these points being referred to as "circuit access points" and "line access points".

CIRCUIT TESTING

ITU-T M.110 SPANISH-1988 电路测试

Access points are required to enable lining-up and subsequent maintenance operations to be performed on international circuits. The required access points are as follows:1.1 Recommendation M.565 describes and defines the access points needed for international public telephone circuits, these points being referred to as "circuit access points" and "line access points".

CIRCUIT TESTING