3.5G Modem







HSDPA Cellular Modem


M500 series modem is a industrial HSDPA 3g modem with RS232 port for industiral wireless M2M solutions.


Comparing to 3G dongle, M500 is 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 M500d 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 M500d 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. M500d 3.5g modem can be used anywhere, e.g. the outdoors, in a bus, conference venues, a boat and even in train. M500d 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 M500d 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.

Download - HSDPA Modem

M500d HSDPA RS232 Modem




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 - M500d 3.5G Router
RS232 Modem
GSM phase2/2+
GSM 850MHz
DCS 1800MHz
PCS 1900MHz

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

Data Speed: 7.2Mbps download, 384kbps upload

Connect to Internet , Audio, Data Transform, Fax, SMS
Supply voltage range 5 - 25VDC(9V suggest)
Class 4 (2W) for EGSM900
Class 1 (1W) for GSM1800
Dimension: 59x100x23mm
Weight: 180g
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 Module Network Power Level Interface Order No.
M500dTUC864 Telit UC864 850/900/1800/1900/2100MHz DC 5V~25V RS232 RS232  
M500dLU6300 Longsung U6300 850/900/1800/1900/2100MHz DC 5V~25V RS232 RS232  
M500dEM770w Huawei EM770w 850/900/1800/1900/2100MHz DC 5V~25V RS232 RS232  
M500dg Huawei EM770w 850/900/1800/1900/2100MHz, with GPS DC 5V~25V RS232 RS232