ITU-T E.458 SPANISH-1996
传真传输性能的品质因数-电话网络和综合业务数字网(ISDN)的业务质量.网络管理和流量工程(2号研究组)6pp

Figure of Merit for Facsimile Transmission Performance - Telephone Network and ISDN Quality of Service Network Management and Traffic Engineering (Study Group 2) 6 pp

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标准号

ITU-T E.458 SPANISH-1996

发布日期

1996年02月01日

实施日期

废止日期

无

中国标准分类号

M10;M11;M39

发布单位

IX-ITU

引用标准

ITU-T E.451 ITU-T E.452 ITU-T E.453

适用范围

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.