ETSI ETS 300 540-1999 数字蜂窝通信系统(第2阶段).GSM公共陆地移动网络系统的语音业务的传输规划方面.GSM 03.50(版本4.6.1)(第6版)
Digital Cellular Telecommunications System (Phase 2); Transmission Planning Aspects of the Speech Service in the GSM Public Land Mobile Network (PLMN) System (Sixth Edition; GSM 03.50 Version 4.6.1)