ETSI ETS 300 540-1998 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4.3.1)(第3版)
Digital Cellular Telecommunications System (Phase 2); Transmission Planning Aspects of the Speech Service in the GSM Public Land Mobile Network (PLMN) System Third Edition; GSM 03.50; Version 4.3.1