Normal operation : -20~+55℃
Restricted operation : -25~+70℃
GPRS data downlink transfer: max. 85.6 kbps
GPRS data uplink transfer: max. 42.8 kbps
Coding scheme: CS-1, CS-2, CS-3 and CS-4
SIM900 supports the protocols PAP (Password Authentication Protocol)
usually used for PPP connections.
The SIM900 integrates the TCP/IP protocol.
Support Packet Switched Broadcast Control Channel (PBCCH)
CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps, non-transparent
Unstructured Supplementary Services Data (USSD) support
MT, MO, CB, Text and PDU mode
SMS storage: SIM card
Support transmission of SMS alternatively over CSD or GPRS. User can
choose preferred mode.
Supported SIM card: 1.8V ,3V
Speech codec modes:
Half Rate (ETS 06.20)
Full Rate (ETS 06.10)
Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
Echo suppression
Connected via 50 Ohm antenna connector or antenna pad.
Serial Port 1 Seven lines on Serial Port Interface
Serial Port 1 can be used for CSD FAX, GPRS service and send
AT command of controlling module.
Serial Port 1 can use multiplexing function, but you can not use the Serial
Port 2 at the same time;
Autobauding supports baud rate from 1200 bps to 115200bps.
Serial port 2 Two lines on Serial Port Interface /TXD and /RXD
Serial Port 2 only used for transmitting AT command.
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