| 标准号 | G.511 |
| 中文名称 | 公共交换电话网中3类传真处理设备的测试方法 |
| 英文名称 | 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 |
| 页数 | 43 |
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