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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.