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ITU E.721:1999

ITU E.721:1999 Network Grade Of Service Parameters And Target Values For Circuit-switched Services In The Evolving Isdn Gives network Grades of Service (GOS) parameters for circuit switched services in ISDN, based on the ISDN Grade of Service concept and guidelines for selecting GOS parameters provided in E.720. The pa

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Table of Contents

1Introduction
2Circuit-switchedservices
2.1pre-selectiondelay(overlapsending)
2.2post-selectiondelay
2.3answersignaldelay
2.4callreleasedelay
2.5probabilityofend-to-endblocking
3TargetvaluesforGOSparameters
4Recommendationhistory

Abstract

Gives network Grades of Service (GOS) parameters for circuit switched services in ISDN, based on the ISDN Grade of Service concept and guidelines for selecting GOS parameters provided in E.720. The parameter values assume that the network and the components are fully operational and take account of the evolving nature of the ISDN and Signalling System No. 7 capabilities.

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