Usefull Link:SIM900_Hardware Design_V2.04,SIM900_AT Command Manual_V1.07,SIM900D_Hardware Design_V2.02
Datasheet：SIM900,SIM900D.
General features
Quad-Band 850/ 900/ 1800/ 1900 MHz
GPRS multi-slot class 10/8
GPRS mobile station class B
Compliant to GSM phase 2/2+
– Class 4 (2 W @850/ 900 MHz)
– Class 1 (1 W @ 1800/1900MHz)
SAIC (Single Antenna Interference Cancellation)
Dimensions: 33* 33 * 3 mm
Weight: 6.4g
Control via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands)
SIM application toolkit
Supply voltage range : 3.2 ... 4.8V
Low power consumption: 1.0mA(sleep mode&BS-PA-MFRMS=9)
Operation temperature: -40°C to +85 °C
Specification for Fax
Group 3, class 1
Specification for GPRS Data
GPRS class 10: max. 85.6 kbps (downlink)
PBCCH support
Coding schemes CS 1, 2, 3, 4
PPP-stack
Specification for CSD Data
CSD up to 14.4 kbps
USSD
Non transparent mode
Specification for SMS
Point to point MO and MT
SMS cell broadcast
Text and PDU mode
Software features
0710 MUX protocol
Embedded TCP/UDP protocol
FTP/HTTP
FOTA
MMS
Embedded AT
Specification for Voice
Tricodec
– Half rate (HR)
– Full rate (FR)
– Enhanced Full rate (EFR)
AMR
- Half rate (HR)
- Full rate (FR)
Hands-free operation
Echo suppression
Interfaces
Interface to external SIM 3V/ 1.8V
Analog audio interface
RTC backup
SPI interface (option)
Serial interface
Antenna pad
I2C
GPIO
PWM
ADC
Compatibility
AT cellular command interface
Approvals
CE, FCC, RoHS, PTCRB, GCF
IC, ICASA, T
