The purpose of this Recommendation is to introduce metncs for Figure of Merit (FOM) for end-to-end facsimile transmission performance. The Recommendation is intended for use by Recognized Operating Agencies (ROAs) to exchange network performance data for service improvement purposes. In previous Recommendations E.45 1, E.452, E.453 and E.456, facsimile meîrics such as facsimile call cut-Offs, modem speed reduction and image quality based on scan line errors and test transactions, respectively, were defined. It would be very useful to produce simple metrics for facsimile FOM that combine all three parameters so that performance of networks can be compared easily and corrective action taken to improve performance. End-to-end facsimile performance includes performance impacts both due to the network and the facsimile terminals. However, when a fixed set of test terminals with nominal terminal performances are used, it is possible to treat the terminal performance as a constant factor and compare network performances. The impact of terminal performance on facsimile call cut-Offs, modem speed reduction and image quality are more fully discussed in Recommendations E.451. E.452 and E.453.
ITU-T E.458 FRENCH-1996由国际电信联盟 IX-ITU 发布于 1996-02-01。
ITU-T E.458 FRENCH-1996 在中国标准分类中归属于: M10 通信网综合,M11 通信网技术体制,M39 传真电报设备。
* 在 ITU-T E.458 FRENCH-1996 发布之后有更新,请注意新发布标准的变化。
非常抱歉,我们暂时无法提供预览,您可以试试: 免费下载 ITU-T E.458 FRENCH-1996 前三页,或者稍后再访问。
点击下载后,生成下载文件时间比较长,请耐心等待......
Copyright ©2007-2022 ANTPEDIA, All Rights Reserved
京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证:京ICP证110310号