ITU-T E.771-1996
电路交换陆地移动业务的网路服务等级(GOS)参数和目标值 E系列:电话网络和综合业务服务网(ISDN)
Network Grade of Service Parameters and Target Values for Circuit-Switched Public Land Mobile Services - Series E: Telephone Network and ISDN Quality of Service Network Management and Traffic Engineering - Traffic Engineering - Mobile Network Traffic Engi