基于wavecom公司的Q24_plus GPRS/GSM 模块的无线modem的原理图设计，软件格式为ORCAD的DSN-On wavecom' s Q24_plus GPRS/GSM wireless modem module, the schematic design, software ORCAD format of the DSN

Scheatic of SIM 300E GSM modem

ETSI EN 300 726 Digital cellular telecommunications systems (Phase 2+) Enhanced Full Rate (EFR) speech transcoding (GSM 06.60)-ETSI EN 300 726 Digital cellular telecommunications systems (Phase 2+) Enhanced Full Rate (EFR) speech transcoding

GSM physical layer implementation using VHDL code.