33.040.30 交换和信令系统 标准查询与下载

ITU-T G.213-1988 主中继站中的系统互连

Interconnection of systems in a main repeater station

ITU-T G.242-1988 群、超群等的直通连接

Through-connection of groups, supergroups, etc.

ITU-T E.144*ITU-T Q.5-1988 半自动业务在国际电话业务中的优势

Advantages of semi-automatic service in the international telephone service

ITU-T E.421-1988 基于统计的服务质量观察

Service quality observations on a statistical basis

ITU-T E.800 SUPP 2-1988 显示提供的流量与电路数量之间关系的曲线

Curves showing the relation between the traffic offered and the number of circuits

ITU-T Q.45BIS-1988 模拟国际交换的传输特性

Transmission characteristics of an analogue international exchange

ITU-T G.225-1988 与载频精度相关的建议

Recommendations relating to the accuracy of carrier frequencies

ITU-T E.507-1988 国际交通预测模型

Models for forecasting international traffic

ITU-T E.541-1988 国际连接的整体服务等级（订户到订户）

Overall grade of service for international connections (subscriber-to-subscriber)

ITU-T E.800 SUPP 5-1988 传输设施故障导致的国际交换和操作程序的电信业务影响

Teletraffic implications for international switching and operational procedures resulting from a failure of a transmission facility

ITU-T G.211-1988 载体链路的组成

Make-up of a carrier link

ITU-T G.231-1988 运载设备布置

Arrangement of carrier equipment

ITU-T E.522-1988 高使用率组中的电路数

Number of circuits in a high-usage group

ITU-T G.222-1988 2500 公里载波传输系统设计的噪声指标

Noise objectives for design of carrier-transmission systems of 2500 km

ITU-T D SUPP 1-1988 成本关税研究方法

Cost and tariff study method

ITU-T E.420-1988 检查国际电话服务的质量 一般注意事项

Checking the quality of the international telephone service - General considerations

ITU-T E.423-1988 对运营商设置的流量的观察

Observations on traffic set up by operators

ITU-T G.243-1988 在有直通连接的点保护导频和额外的测量频率

Protection of pilots and additional measuring frequencies at points where there is a through-connection

ITU-T G.229-1988 不需要的调制和相位抖动

Unwanted modulation and phase jitter

ITU-T G.230-1988 调制设备和直通滤波器产生的噪声测量方法

Measurement methods for noise produced by modulating equipment and through-connection filters