User's Manual

SIM908 Document
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mode (GPS engine is powered down).
SIM908 integrates TCP/IP protocol and extended TCP/IP AT commands which are very useful for data transfer
applications.
1.2 SIM908 Key Features
Table 1: SIM908 GSM/GPRS engine key features
Feature Implementation
Power supply 3.4V ~ 4.5V
Power saving
Typical power consumption in sleep mode is 1.0mA ( BS-PA-MFRMS=9, GPS
engine is powered down )
Charging Supports charging control for Li-Ion battery
Frequency bands
z SIM908 Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. SIM908
can search the 4 frequency bands automatically. The frequency bands also
can be set by AT command “AT+CBAND”. For details, please refer to
document [1].
z Compliant to GSM Phase 2/2+
Transmitting power
z Class 4 (2W) at GSM 850 and EGSM 900
z Class 1 (1W) at DCS 1800 and PCS 1900
GPRS connectivity
z GPRS multi-slot class 10（default）
z GPRS multi-slot class 8 (option)
Temperature range
z Normal operation: -20°C ~ +60°C
z Restricted operation: -40°C ~ -20°C and +80 °C ~ +60°C
*
z Storage temperature -45°C ~ +90°C
Data GPRS
z GPRS data downlink transfer: max. 85.6 kbps
z GPRS data uplink transfer: max. 42.8 kbps
z Coding scheme: CS-1, CS-2, CS-3 and CS-4
z Integrate the TCP/IP protocol.
z Support Packet Broadcast Control Channel (PBCCH)
CSD
z Support CSD transmission
USSD
z Unstructured Supplementary Services Data (USSD) support
SMS
z MT, MO, CB, Text and PDU mode
z SMS storage: SIM card
FAX Group 3 Class 1
SIM interface Support SIM card: 1.8V, 3V
External antenna Antenna pad
Audio features
Speech codec modes:
z Half Rate (ETS 06.20)
z Full Rate (ETS 06.10)
z Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
z Adaptive multi rate (AMR)