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ITU-T E.520 Number of circuits to be provided in automatic and/or semiautomatic operation, without overflow facilities
ITU-T E.521 Calculation of the number of circuits in a group carrying overflow traffic
ITU-T E.523 Standard traffic profiles for international traffic streams
ITU-T E.540 Overall grade of service of the international part of an international connection
ITU-T E.522 Number of circuits in a high-usage group
ITU-T E.541 Overall grade of service for international connections (subscriber-to-subscriber)
ITU-T E.543 Grades of service in digital international telephone exchanges
ITU-T E.845 Connection accessibility objective for the international telephone service
ITU-T E.720 ISDN grade of service concept
ITU-T E.855 Connection integrity objective for the international telephone service
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