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T900_User Guide_V1.02 26 2013-05-22
7.4 Operating frequency
The operating frequencies in GSM850, EGSM900, DCS, PCS modes are conform to the GSM Specifications,
shown as bellow.
Table 18: Operating frequency
Mode Freq. TX(MHz) Freq. RX(MHz)
Channels(A
RFC)
TX-RX offset
GSM-850 824 – 849 869 – 894 128 - 251 45 MHz
890-915 935-960 0–124 45MHz
E-GSM-900
880-890 925 - 935 975-1023 45MHz
DCS-1800 1710-1785 1805-1880 512–885 95 MHz
PCS-1900 1850 - 1910 1930 - 1990 512 - 810 80 MHz
7.5 Transmitter output power and receiver sensitivity
The T900’s conducted transmitter output power and receiver sensitivity are shown as bellow:
Table 19: Transmitter output power and receiver sensitivity
Mode Power(dBm) Sensitivity(dBm)
GSM-850 +33 -108
E-GSM-900 +33 -108
DCS-1800 +30 -107
PCS-1900 +30 -107
8 Software/ Firmware Upgrade
The software can be upgraded via the RS232 interface with the help of tools provided by SIMCom,
8.1 Tool introduction
The tool name is “SIM900 Series download Tools Customer 1.6”, which runs on the windows OS, customers can
upgrade software conveniently by it.
This tool is a single-road download tool, one terminal can be upgraded by it every time. SIMCom also provides
multi-road download tools for customer’s factory use. Contact SIMCom sales for support.
8.2 Illustration of software updating
z Open the tools, the main operation interface as the figure 16 shows:
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