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>>| Hot Spot
Broadband M2M communications
SIM failover/standby APN
3G/4G failover for fixed line broadband connections
Rapid service deployment applications

>>| Product Introduction
We short name Serial to GPRS Gateway as GPRS DTU IP Modem. And Serial to CDMA Gateway as CDMA DTU IP Modem.
D120 Series DTU modem enables various kinds of legacy devices with serial port to communicate over cellular network and the Internet easily and freely. It not only works as a cellular modem, but also can construct a smooth "cellular Data Tunnel" between Host and Remote side, ensuring an efficient communication for data transmission and remote device management.
With the selectable RS232/TTL/RS485/RS422 serial port, D120 Series DTU modem is an ideal solution for factory automation, environmental monitoring and remote device management etc. Meanwhile, it is supplied with simple Software interface that streamline application development process, freeing system integrators from dealing with complex communication protocols of GPRS/CDMA and the Internet. Users do not need to change the existing system, saving cost and time for field maintenance, and making it a perfect solution for data transmission.

>>|Specification
Wireless
GSM/DCS Frequency bands:
Rx (GSM 850): 869 to 894 MHz
Rx (E-GSM 900): 925 to 960 MHz
Rx (DCS 1800): 1805 to 1880 MHz
Rx (PCS 1900): 1930 to 1990 MHz
Tx (GSM 850): 824 to 849 MHz
Tx (E-GSM 900): 880 to 915 MHz
Tx (DCS 1800): 1710 to 1785 MHz
Tx (PCS 1900): 1850 to 1910 MHz
Transmit power:
Class 4 (2 W) at GSM 850 and E-GSM
Class 1 (1 W) at DCS and PCS
CDMA1x 800/1900Mhz, 450Mhz optional
GPRS GPRS multislot class 10
Multislot class 2 supported
PBCCH support
Coding schemes: CS1 to CS4
Bandwidth GPRS 4:1
Down-link: 85.6kbps Up-link: 21.4kbps
GPRS 3:2
Down-link: 64.2kbps Up-link: 42.8kbps
Protocol
Protocol Support TCP/IP
Interface
Antenna 50Ω SMA female interface
Serial Port DB9 (RS232, RS485, RS422, TTL option) 1200~115200bps
LED Power LED
Ring LED
Data LED
UIM/SIM 1.8V/3V
Power
Power supply DC5V-25V , typical DC 9V1A
Power Consumption Peak: 0.8A@+9VDC
Average: 30mA@+9VDC
Idle: 3.5mA@+9VDC
Software
User Interface AT Command set
Embedded Development Environment Support(32M FLASH and 16M RAM)
Open AT API develop kit
Physical
Operating Temperature work temperature: -30～85℃
Humidity 90% Maximum (Non-condensing)
Dimensions Item (L x B x H): 75mm x 50mm x 16mm(5.3”x3.7”x1.4”)
Packaging (L x B x H): 260mm x 190mm x 65mm(10.3”x7.5”x2.6”)
Weight Item: 550g
Packaging: 690g
Electronic Compatibility Anlistatig test: Class 3
Radio electromagnetism test: Class 3
Others
Warranty 1 Year
Package Contents The D120 Series DTU Modem
DB9 Serial Cable
DC 9V/1A Power Adapter
Antenna
CD-ROM with Product Documentation
Model
D120g GPRS DTU IP Modem
D120c CDMA DTU IP Modem

>>| Industrial Application
Remote Data Monitor and Control
CCTV, security surveillance
Water, gas and oil flow metering and schedule
AMR (automatic meter reading)
Power station monitoring and control
Remote POS (point of sale) terminals, ATM,
Traffic signals monitor and control, Traffic info guidance
Oil field, weather forecast, environmental protection, street lamp monitoring and control
Early Warning of Mountain Torrent
Fleet management
Power distribution network supervision
Central heating system supervision
Weather station data transmission
Hydrologic data acquisition
Vending machine
Telemetry, SCADA
Vehicle logistics and diagnostics controlling
Parking meter and Taxi Monitor
Telecom equipment supervision (Mobile base station, microwave or optical relay station)