M18 通信设备容量系列 标准查询与下载

ITU-R SM.1131 FRENCH-1995 在世界范围内分配频谱的考虑因素

The ITU Radiocommunication Assembly considering a) that the Radio Regulations (RR) specify three “radio Regions” (RR Nos. 392 to 399); b) that, between the three Regions, there are many differences in allocated services and allocated band limits; c) that worldwide allocations can: simplify the Table of Frequency Allocations; ease coordination requirements; promote equipment availability for international markets and reduce production costs, thus helping to meet the requirements of developing countries in particular; facilitate activities that depend on internationally operable equipment (i.e. flight traffic control); d) that the factors to consider when evaluating the need for a worldwide allocation versus separate regional allocations in a specific frequency range need to be delineated.

FACTORS TO CONSIDER IN ALLOCATING SPECTRUM ON A WORLDWIDE BASIS

ITU-R SM.1048-1994 基本自动频谱管理系统的设计指南(BASMS)

that the creation of a spectrum management system would support and facilitate national spectrum management and monitoring, coordination among administrations and notification to the Radiocommunication Bureau (BR)

Design Guidelines for a Basic Automated Spectrum Management System (BASMS)

ITU-R SF.1005-1993 固定业务和固定卫星业务在高于10GHz目前分配给单向使用的频段的双向使用的共享

that existing sharing criteria are based on fixed-satellite systems in unidirectionally allocated frequency bands

Sharing between the Fixed Service and the Fixed-Satellite Service with Bidirectional Usage in Bands Above 10 GHz Currently Unidirectionally Allocated

ITU-T P.52-1993 容量计-电话转换质量

The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to

Volume Meters - Telephone Transmission Quality - Objective Measuring Apparatus (Study Group XII) 5 pp

DLA MIL-D-3954 C SUPP 1A-1989 电子波导仿真载荷的一般规范

this supplement forms apart of MIL-D-3954Cn 19 November 1973.

DUMMY LOADS, ELECTRICAL WAVEGUIDE, GENERAL SPECIFICATION FOR

ITU-T G.211-1989 载波链路的构成 国际模拟载波系统(研究15组)8pp

Figure l/G.211, a) and c) gives a recapitulation of the basic frequency bands used in procedure 2 in which the through-connection facilities described in Recommendation G.242 are provided.

Make-up of a Carrier Link - International Analogue Carrier Systems (Study Group XV) 8 pp

ITU-T Q.135-1989 测试设备快速传输的原则

Rapid transmission tests can be made by two methods

Principles of Rapid Transmission Testing Equipment - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 1 pp

ITU-T Q.136-1989 弯曲传输测量-信号系统的规格

Testing of the circuit and signalling equipment should include a check that the specifications of System No. 4 are met in regard to the following

Loop Transmission Measurements - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 1 pp

ITU-T Q.137-1989 自动测试设备-信号系统的规格

The second method for rapid transmission tests consists of extending international circuit, by means of a special code, to an automatic testing equipment at the incoming exchange. For this method, there must be incoming testing equipment at the incoming i

Automatic Testing Equipment - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 2 pp

ITU-T R.30-1989 国际VFT链路的传输特性

Recommendation 300 bits per second duplex modem standardized for use in the general switched telephone network, Rec. V.21.

Transmission Characteristic for International VFT Links - Telegraph Transmission (Study Group IX) 2 pp

ITU-T Q.139-1989 手工测量-信号系统的规格

The first method consists of a rapid verification of unsatisfactory signal transmission by ensuring that a seizing signal is followed by the return of a proceed-to-send signal, that a clear-forward signal is followed by the return of a release-guard signa

Manual Testing - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 3 pp

ITU-T G.212-1989 模拟系统的假设参考电路 国际模拟载波系统(研究15组)3pp

In order to take account of the variety of operating conditions and in particular the differences there may be in the size of the countries to be served, the CCITT has defined two categories of hypothetical reference circuits for telephony

Hypothetical Reference Circuits for Analogue Systems - International Analogue Carrier Systems (Study Group XV) 3 pp

DLA MIL-D-81976 VALID NOTICE 1-1988 DA-662/UPQ-5型电子仿真载荷

MIL-D-81976(AS), dated 17 June 1974, has been reviewed and determined to be current.

DUMMY LOAD, ELECTRICAL DA-662/UPQ-5

ITU-T F.64-1988 通讯所需运载给定容量的国际电报电路数目的测定.电报和移动业务操作及服务质量(研究组I)

The CCIT?, considering (a) that it is essential to provide an adequate number of circuits between two telex networks in order to provide the rapid service stipulated in Recommendation F.60; (b) that the use of tables for the determination of the number of circuits as a function of the traffic to be dealt with during the busy hour is an established practice in all Administrations, and is a convenient means of indicating a standard; (c) that international telex circuits may be selected either at manual positions, or via automatic switching equipment, particularly where subscriber-to-subscriber selection is employed between two networks;

Determination of the Number of International Telex Circuits Required to Carry a Given Volume of Traffic - Telegraph and Mobile Services Operations and Quality of Service (Study Group I) 5 pp

SJ 2741-1987 数字无线电微波接力通信系统容量系列及射频波道配置

本标准适用于工作在0.4～20GHz频段的专用数字无线电微波接力通信系统。

Capacity series and r.f. waveguide adaptations of digital microwave link communication systems

ITU-R SM.508-1978 频谱利用研究中无线噪声数据的使用

that for system design and system performance analysis for use in spectrum utilization studies information

(WITHDRAWN) Use of Radio-Noise Data in Spectrum Utilization Studies - Section 1D - Spectrum Utilization and Applications

DLA MIL-D-81976-1974 DA-662/UPQ-5型电子仿真载荷

shall be for intermediate (shop) use and shall provide resistive loading for the operation of Static Fre.quency Converter CV-Z933/UPQ- 5.

DUMMY LOAD, ELECTRICAL DA-662/UPQ-5

DLA MIL-D-3954 C-1973 电子波导仿真载荷的一般规范

This s p e c i f i c a t i o n covers t h e g e n e r a l requirements f o r waveguide electrical dummy loads f o r use i n terminating r a d i o frequency transmission l i n e s (see 6.1).

DUMMY LOADS, ELECTRICAL WAVEGUIDE, GENERAL SPECIFICATION FOR