SimCom SIM900B Hardware Design page 9

Data GPRS
CSD
USSD
SMS
FAX
SIM interface
External antenna
Audio features
Serial port and
debug port
Phonebook management
SIM application toolkit
Real time clock
Physical characteristics
Firmware upgrade
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SIM900B does work at this temperature, but some radio frequency characteristics may deviate from the GSM specification.
SIM900B_Hardware Design_V2.01
Restricted operation: -40°C ~ -30°C and +80 °C ~ +85°C
Storage temperature -45°C ~ +90°C
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
Integrate the TCP/IP protocol.
Support Packet Broadcast Control Channel (PBCCH)
Support CSD transmission
Unstructured Supplementary Services Data (USSD) support
MT, MO, CB, Text and PDU mode
SMS storage: SIM card
Group 3 Class 1
Support SIM card: 1.8V, 3V
Antenna pad
Speech codec modes:
Half Rate (ETS 06.20)
Full Rate (ETS 06.10)
Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
Adaptive multi rate (AMR)
Echo Cancellation
Noise Suppression
Serial port:
Full modem interface with status and control lines, unbalanced,
asynchronous.
1200bps to 115200bps.
Can be used for AT commands or data stream.
Support RTS/CTS hardware handshake and software ON/OFF flow control.
Multiplex ability according to GSM 07.10 Multiplexer Protocol.
Autobauding supports baud rate from 1200 bps to 57600bps.
Debug port:
Null modem interface DBG_TXD and DBG_RXD.
Can be used for debugging and upgrading firmware.
Support phonebook types: SM, FD, LD, RC, ON, MC.
GSM 11.14 Release 99
Support RTC
Size: 40mm * 33mm*3mm
Weight: 7g
Firmware upgradeable by debug port.
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Smart Machine Smart Decision
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2012-05-07