SIMCOM multiplexing technique document: with GSM and GPRS function equipment need to simultaneously processing (sending and receiving) various data flow, for example AT instructions, GPRS data streams, GSM lines, these handover data flow data independent with each other. SIM900 hardware design manual: this document describes SIM900s hardware application interface, including relevant applications the connections and rf interface, interface definition, electrical properties and structure size of detailed information.

SIM900\AN_SIM900-TE PCB Layout & Schematic for Reference_V1.01.pdf
......\SIM900D-TE_PCB Layout & Schematic for Reference_Application Note_V1.00.pdf
......\SIM900_download procedure_V0.20.pdf
......\应用_SIM900_多路复用使用手册_V1.6.pdf
SIM900

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