SIM548C 
SIM548C module is a compact Quad-Band GSM/GPRS-enabled module that is also equipped with GPS technology for satellite navigation. The compact design of the SIM548C makes it easy to integrate GSM/GPRS & GPS as an all-in-one solution. You will save 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) 
  - Control 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…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: 50*33*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 μs synchronized to GPS time 
  - Position with DGPS/SBAS: 2.0 CEP 
  - Date WGS-84 
  - Acquisition rate (TTFF defined at 95% of first position local station) 
     – Hot start < 1 s, average, open sky 
     – Warm start: 35 s, average, open sky 
     – Cold start: 35 s, average, 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 interface 
  - AT commands via serial interface 
  - Embedded SIM card holder 
  - LCD Interface 
  - RTC Backup 
  - Charge interface 
  - Serial interface and Debug interface 
  - Dual serial interfaces for GPS 
  - Two separate antenna connectors for GSM/GPRS & GPS and two antenna pads for GSM/GPRS & GPS