ITU E.550:1993
ITU E.550:1993 Grade-of-service And New Performance Criteria Under Failure Conditions In International Telephone Exchanges
Table of Contents
1Introduction2Generalconsiderations
3Exchangeperformancecharacteristicsunderfault
situations
4GOSandapplicablemodels
5GOSstandardsandinaccessibility
6Performancemonitoring
AnnexA
A.1Modelformeanexchangeinaccessibility
A.2Exampleforcalculatingtheinaccessibility,P
AnnexB
Evaluationofinstantaneousexchangeserviceinaccessibility