User's Manual

SIM908 Document
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z Echo Cancellation
z Noise Suppression
Serial port and
debug port
Serial port:
z Full modem interface with status and control lines, unbalanced,
asynchronous.
z 1200bps to 115200bps.
z Can be used for AT commands or data stream.
z Support RTS/CTS hardware handshake and software ON/OFF flow control.
z Multiplex ability according to GSM 07.10 Multiplexer Protocol.
z Autobauding supports baud rate from 1200 bps to 57600bps.
Debug port:
z Null modem interface GPS/DBG_TXD and GPS/DBG_RXD.
z Can be used for debugging and upgrading firmware.
Phonebook management Support phonebook types: SM, FD, LD, RC, ON, MC.
SIM application toolkit GSM 11.14 Release 99
Real time clock Support RTC
Physical characteristics
Size: 30*30*3.2mm
Weight: 5.2g
Firmware upgrade Firmware upgradeable by debug port.
*
SIM908 does work at this temperature, but some radio frequency characteristics may deviate from the GSM
specification.
Table 2: GPS engine Performance
Performance
Parameter Description
Min Typ Max Unit
Horizontal Position
Accuracy
(a)
Autonomous 2.5 m
Speed - 0.01 - m/s
Velocity Accuracy
(b)
Heading - 0.01 - °
Hot start - 1 - s
Time To First Fix
(c)
Cold start - 30 - s
Autonomous
acquisition
-143 dBm
Sensitivity
Tracking -160 dBm
Channels 42
Update rate 1 Hz
Receiver
Altitude 18288 m