3.5G Modem







HSDPA Cellular Modem


What is a 3.5G modem and 3.75G Modem? Simply speaking, it's a kind of 3G modem works under HSDPA networks or HSUPA networks. We name HSDPA network as 3.5G networks, and HSUPA network as 3.75G networks.


The Wireless 3.5 modem is widely used in various kinds of wireless M2M solutions nowadays. For data transmission or for SMS, or other applications.


The M300d HSDPA cellular modem and UH683um HSUPA Modem offer the ultra-fast HSDPA at 7.2Mbps (downlink) and 3G HSUPA at 5.76Mbps. If neither is available, the bus-powered USB HSDPA modem can resort to quad-band EDGE/GPRS at up to 384kbps. (HSUPA 3.75g modem can be 14.2Mbps downlink and 5.76Mbps uplink)

HSDPA USB Modem M300d allows mobile e-mail and internet access. Even multimedia streaming is possible. The ultra compact quad-band ,it has all the right industry standard interfaces for dial-up , voice, SMS and fax applications. It can be powered by a wide range of voltages. A built-in SIM card reader makes it easy to plug the USB HSDPA Modem into your application.

And in order to get your product to the market quickly and easily. M300d 3.5g modem can be used anywhere, e.g. the outdoors, in a bus, conference venues, a boat and even in train. M300d 3.5g USB Modem & UH683um 3.75g modem brings the mobile Internet service to any location with a suitable power supply

Additionally, the most application for the M300d HSDPA USB modem is for the M2M wireless solutions.


HSDPA USB Modem - Industrial Application


  • 1) Remote Data Monitor and Control;

  • 2) CCTV, security surveillance;
  • 3) Water, gas and oil flow metering and schedule;
  • 4) AMR (automatic meter reading);
  • 5) Power station monitoring and control;
  • 6) Remote POS (point of sale) terminals, ATM,
  • 7) Traffic signals monitor and control, Traffic info guidance;
  • 8) Oil field, weather forecast, environmental protection, street lamp monitoring and control
  • 9) Early Warning of Mountain Torrent;
  • 10) Fleet management;
  • 11) Power distribution network supervision;
  • 12) Central heating system supervision;
  • 13) Weather station data transmission;
  • 14) Hydrologic data acquisition;
  • 15) Vending machine;
  • 16) Telemetry, SCADA;
  • 17) Vehicle logistics and diagnostics controlling;
  • 18) Parking meter and Taxi Monitor;
19) Telecom equipment supervision (Mobile base station, microwave or optical relay station)


For more HSDPA cellular modem solutions, please refer to the catalog and brochures.


What does it require if use a 3.5G modem and 3.75G modem?

1. Device supports USB port;

2. A sim card supports 3.5g HSDPA network or 3.75g HSUPA network;
3. 3.5g or 3.75g network signal is available in the site where the device is installed.


M300 Class Types:

M300 Series 3G modem contains following:


M300d - HSDPA version, works under HSDPA/EDGE/GPRS/GSM networks;


M300u - HSUPA version, works under HSUPA/HSDPA/EDGE/GPRS/GSM networks;


M300p - HSPA version, works under HSPA/HSUPA/HSDPA/EDGE/GPRS/GSM networks;


M300p+ - HSPA+ version, works under HSPA/HSUPA/HSDPA/EDGE/GPRS/GSM networks;


M300ev - CDMS2000 EVDO version, works under EVDO/CDMA1x networks;


M300t - 4G LTE version, works under 4G LTE and back compatible to HSPA/HSUPA/HSDPA/EDGE/GPRS/GSM networks;


Download - HSDPA Modem

M300d HSDPA USB Modem


Quick Start

User Manual


M300dg with GPS


Quick Start



For more Industrial Cellular Mobile Modems, please refer to Wireless_Modem_list


For non-industrial cellular mobile modems, please refer to



Catalog - Router Modem AP


Industrial Class Series


SOHO Class Series

Appearance - M300d 3.5G Router
3.5G Modem
GSM phase2/2+
GSM 850MHz
DCS 1800MHz
PCS 1900MHz

UMTS/WCDMA/HSDPA: 2100Mhz or 850/900/1900/2100Mhz

Data Speed: 7.2Mbps download, 384kbps upload

Connect to Internet , Audio, Data Transform, Fax, SMS
Port: USB2.0
Supply voltage range 7 - 25VDC(9V suggest)
Class 4 (2W) for EGSM900
Class 1 (1W) for GSM1800
Dimension: 93mm*70mm*23mm
Weight: 200g
Steel shell: good electromagnetic shield and , heat radiate performance
Electromagnetic Compatible
Electrostatic Discharge (ESD): 3 class
Radiated, radio-frequency, electromagnetic field immunity test: 3 class
Storage Temperature: -40 ~ 85°C
Working Temperature: -30 ~ 75°C
Humidity: 95% (non-condensing)
Product Version Network Band Interface Order No.
M300d HSDPA HSDPA/UMTS/EDGE/GPRS/GSM 850/900/1800/1900/2100MHz USB2.0  
M300u HSUPA HSUPA/HSDPA/UMTS/EDGE/GPRS/GSM 850/900/1800/1900/2100MHz USB2.0  
M300p HSPA HSPA/HSUPA/HSDPA/UMTS/EDGE/GPRS/GSM 850/900/1800/1900/2100MHz USB2.0  
M300p+ HSPA+ HSPA+/HSPA/HSUPA/HSDPA/UMTS/EDGE/GPRS/GSM 850/900/1800/1900/2100MHz USB2.0  
M300ev EVDO EVDO/CDMA1x 800/1900MHz USB2.0