ETSI PRETS 300 903-1999 数字蜂窝通信系统(第2+阶段).GSM公共陆地移动网络(PLMN)系统中语音业务的传输规划方面.第4版.GSM 03.50(版本5.3.0,1996年发布)
Digital Cellular Telecommunications System (Phase 2+); Transmission Planning Aspects of the Speech Service in the GSM Public Land Mobile Network (PLMN) System Fourth Edition; GSM 03.50 Version 5.3.0 Release 1996