G400E
User Manual
OpenVox Communication Co. LTD.
URL: www.openvox.cn
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In addition, there are two LEDs located at the bottom of the board which
are D8 and D9, under normal circumstances, they are lit when powered
and D9 flashes more quickly than D8.
2.4
GSM modules and SIM cards
G400E supports 2G and 3G module, detail information about 3G modules
. One GSM module supports one SIM card and one
antenna, please plug a SIM card into the back of a GSM module and
activate it. For more details, please refer to figure 3.
2.5 Introduction of main chipset
Designed for global market, M20 is quad-band GSM/GPRS engine that
works on frequencies, GSM/GPRS 850/900/1800/1900 MHz.
With a tiny configuration of 35mm × 32.5mm × 2.95 mm, M20 can fit
almost all the space requirement in your application, such as smart phone,
PDA phone, Car Phone, Wireless PSTN, and other mobile devices.
The M20 provides RF antenna interface. Customer’s antenna should be
located in the customer’s main board and connect to module’s antenna
pad through micro strip line or other type RF traces whose impendence
must be controlled in 50Ω.
The M20 is integrated with the TCP/IP protocol
，
Extended TCP/IP AT
commands are developed for customers to use the TCP/IP protocol easily,
