ETSI PRETS 300 540-1998 数字蜂窝通信系统(第2阶段).GSM公共陆地移动网(PLMN)系统的语音业务的传输规划方面.GSM 03.50(第4版,版本4.4.0)
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 4.4.0