The overall grade of service (subscriber-to-subscriber) on international connections – relating only to the phenomena of congestion in the entire network as a result of the traffic flow – depends on a number of different factors, such as the routing arrangements in the national and international parts of the connection, congestion allowed per switching stage, the methods used to measure traffic and compute the traffic base, and the time differences between the busy hours of the various links involved in the connection.
ITU-T E.541-1993 Referenced Document
ITU-T E.171 International Telephone Routing Plan (Study Group II)
ITU-T E.500 Traffic Intensity Measurement Principles - Series E: Overall Network Operation Telephone Service Service Operation and Human Factors Quality of Service Network Management and Traffic Engineering - Traffic Engineering - Measurement and Recording of Traffic*, 1998-04-19 Update
ITU-T E.540 OVERALL GRADE OF SERVICE OF THE INTERNATIONAL PART OF AN INTERNATIONAL CONNECTION
ITU-T E.541 OVERALL GRADE OF SERVICE FOR INTERNATIONAL CONNECTIONS (SUBSCRIBER-TO-SUBSCRIBER)
ITU-T E.541-1993 history
1993ITU-T E.541-1993 OVERALL GRADE OF SERVICE FOR INTERNATIONAL CONNECTIONS (SUBSCRIBER-TO-SUBSCRIBER)