Test methodology for Group 3 facsimile processing equipment in the Public Switched Telephone Network
发布日期
1998-02-01
标准状态
被代替;
摘要
This Recommendation defines the testing methodology for evaluating the performance of Group 3
facsimile processing equipment incorporated in Signal Processing Network Element (SPNE) of the
Public Switched Telephone Network.
The testing methodology covers the following aspects:
1) facsimile recognition (i.e. detection and classification);
2) proprietary facsimile fall-back to ADPCM path;
3) Group 3 facsimile image quality in presence of:
a) combined access link impairments and bearer link impairments;
b) bearer link impairments;
4) recovery following unexpected events during the facsimile call set-up;
5) voiceband data quality;
6) effect of variability in the implementation of the T.30 protocol;
7) effects of transmission level variation and echo return loss;
8) impact of transmission integrity due to timing deviations on facsimile call quality.
本建议定义了集成在公共交换电话网的信号处理网络元素中的3类传真处理设备性能的评测方法。该测试方法包括:1)传真识别(探测和分类);2)到ADPCM路径所有权传真落差;3)3类传真图象质量在出现:a)联合接入链路损害和载运链路损害;b)载运链路损害 4)传真呼叫建立期间的意外事件的恢复;5)语音频带数据质量;6)执行T.30 协议的可变性效果;7)传输水平变化和回声返回损失的效应;8)在传真呼叫质量上由于定时背离的传输完整性的效应。
使用在图形1的测试中的基本配置
备注
This Recommendation was renumbered as ITU-T Rec. T.5 on 2002-02-15 without further modification