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Detailed Overview of D120 Modem

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D120 Series Cellular IP Gateway Modem

>> Appearance

D120 Series Cellular IP Gateway Modem

More Picture and Diagram for D120 Modem >>

>> Brief

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.

The difference between DTU modem and normal modem

Item DTU IP Modem Normal Modem
Dial up

Support automatically dialup;

Online always; trigger to dialup, schedule to dialup
Need machine/pc back platform to dialup
TCP/IP, PPP Yes Yes
Interface RS232/RS485 RS232/RS485
Bandwidth for GPRS/CDMA 20~60Kbit/s 20~60Kbit/s
Coverage Same as GSM network Same as GSM network
Transparent Data transmission Yes No
VDPN Yes Yes
Point to Point Yes Depends on network
Point to Multipoint Yes No
Center to Multipoint Yes No
Dynamite IP Address Mapping Yes No
Multi-protocol Yes No
Applications Utilities, traffic control, finance and industry supervision, for device not support dialup Mobile Internet access for PC, for device support dialup

DTU: Data Transmission Unit. Some one calls it as IP modem, or serial IP modem.
It is called as DTU modem by some users.

>>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)

etc.