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产品详情：
SIM548C module is a compact Quad-Band GSM/GPRS-enabled module that is also equipped with GPS technology for satellite n*igation. The compact design of the SIM548C makes it easy to integrate GSM/GPRS & GPS as an all-in-one solution. You will s*e significantly both time and cost for the integration of additional hardware components.
Featuring an industry-standard interface and GPS function, the combination of both technologies allows valuable asset to be tracked seamlessly at any location and anytime with signal coverage.
General features
Quad-Band GSM 850/900/1800/1900MHz
GPRS multi-slot class 10
GPRS mobile station class B
Compliant to GSM phase 2/2+
Class 4(2W @ GSM850/900MHz)
Class 1(1W @ GSM1800/1900MHz)
Co*ol via AT commands (GSM 07.07 and 07.05 and SIMCom enhanced AT commands)
SIM application tool kit
Low power consumption
Supply voltage range 3.4 .5 V
Normal operation temperature: -30 C to +80 C
Restricted operation temperature: -40 C to -30 C and +80 C to +85 C
Storage temperature: -45 C to +90 C
Dimension: 50mm x 33mm x 8.8mm
Specifications for GPS
Receiver 20 channels, L1 1575.42 MHz, C/A code 1,023 MHz chip rate
Accuracy Position 2.5 m CEP
without SA/Velocity 0.1 m/s,
without SA/Time 1 s synchronized to GPS time
Position with DGPS/SBAS: 2.0 CEP
Date WGS-84
Acquisition rate (TTFF defined at 95% of first *ition local station)
Hot start < 1 s, *erage, open sky
Warm start: 35 s, *erage, open sky
Cold start: 35 s, *erage, open sky
Support AGPS
Operating voltage 3.3 V DC 5%
Low power consumption 160mW at 3.3 V (full power)
Protocols
NMEA-0183
SiRF binary
RTCM SC-104
Crystal oscillator (TCXO), temperature compensated with frequency stability of 0.5 ppm
Memory 4 Mb flash and 1Mb SRAM
Interfaces
60-pin DIP connector
Interface to external SIM 3V or 1.8V
Dual analog audio interfa