USR Courier® Lite 56K* Business Modem - Discontinued

Overview & Features     Specifications     Data Sheet     Support   Video

Mission critical dial-up connectivity for Business

USR5686g-pro Product Diagram

The USR® Courier® Lite 56K* Business Modem with V.Everything® technology provides secure, reliable analog connections. Many modems claim reliability, but even fewer offer the multitude of advanced business features like Courier’s Carrier Loss Redial, Dialback Security, and Remote Access capabilities. Point of Sale, M2M (Machine to Machine), IoT (Internet of Things) applications as well as Out of Band Management and Remote Management deployments utilize remote access to configure or troubleshoot. With over 1 million units sold world-wide, the Courier family of modems real-world performance is unmatched. When failure is not an option, you need the world-class capabilities that only come from the top of the USR product line.

Incredible Compatibility and Flexibility

  • V.Everything Technology provides support for all key communications protocols
  • Highly reliable hardware platform supports connections with most international phone systems
  • Supports all major operating systems: DOS, Windows including Server and 64 bit, UNIX, Linux — any operating system that supports an RS-232 serial port

Integrated Multilayered Security

  •   Dial Security:

    1. Autopass — works with up to 5 users and automates logging in between two Couriers by including the password in the V.42 error-control request
    2. Password Prompting — works with any type of modem, where the host Courier requests a password from those dialing in
  • Dialback Security checks incoming calls for password authorization and then dials back predefined numbers to assure only appropriate users establish connections

Rock-solid Reliability

  • Carrier Loss Redial automatically senses, redials, and re-establishes dropped remote connections – creates a virtual always-on connection between two modems over analog dial-up lines
  • Advanced Line Probing technology finds the fastest connection and maintains connections under poor line conditions
  • Brown-out Protection assures you stay connected even in areas with poor power facilities
  • Robust, business-oriented design, component selection, testing, and experience to support non-stop operation

Advanced Features and Functionality

  • Remote access and management lets you configure or troubleshoot from almost anywhere
  • Use as a secondary connection to troubleshoot, reconfigure, and reboot network devices through a console port
  • External 8 position DIP switch allows manual configuration of specific critical settings
  • Extra LEDs for better monitoring of serial signals
  • Precise manual volume control
  • Permanently store preferred modem default settings

* Capable of receiving at up to 56 Kbps and sending at up to 48 Kbps (or 31.2 Kbps with V.90 server). Due to FCC regulations on power output, receiving speeds are limited to 53.3 Kbps. Actual speeds may vary. V.92 and V.90 features require compatible phone service and support from your Internet Service Provider (ISP). U.S. Robotics modems featuring V.92 enhancements are backward compatible and will negotiate the highest possible speed when connecting to an ISP.
** Support for 64 bit operating systems requires a driver update (available in the support section of the website at Support for newer Operating Systems may also be available.


Courier® Lite 56K* Business Modem


Product Code : USR845686G-PRO

Approved for EU 

Additional Availability

Additional Power Supply

110-240 V for US, UK and Europe
3453C Power Supply

* Kit may be required.

Contact Us

  • Phone (UK):
    +44 (0)808 234 5935

Windows Product Compatibility Windows Product Compatibility