Technology Transfer SSC Pacific
Fixed Network Access Device (FNAD) for Wireless-to-TCP/IP Communications

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The U.S. Navy developed a fixed wireless bridge that enables bidirectional communication between IEEE 802.15.4-based end devices and TCP/IP networks.


In order to improve global cargo container security, SSC Pacific developed custom network protocols, Fixed Network Access Devices, and Handheld Network Access Devices which included an Android-based mobile app. These technologies allow for the monitoring and control of IEEE 802.15.4-based electronic locks and security devices on shipping containers throughout the global supply chain. The Fixed Network Access Device is described below.

The Technology

SSC Pacific’s Fixed Access Network Device (FNAD) includes a processor with memory, a radio frequency transceiver, and an antenna. Using custom network protocols, the FNAD transmits a Network Access Device Announcement (NADA) to initiate passive network discovery among 802.15.4-based security devices. When a security device receives a NADA, it initiates and establishes communication with the FNAD. The FNAD then forwards, in real-time, device status messages to a Data Center via TCP/IP. Passive network discovery and other features allow battery conservation in security devices. The FNAD has potential applications in wireless sensor networks, mobile health devices, security networks, and home automation networks.


  • Supports real-time, over the air communication
  • Allows security devices to scan a minimal number of IEEE 802.15.4 channels for NADA, as opposed to scanning all available RF channels
  • Uses CSMA/CA instead of TDMA for medium access, thus precise message latency management is not required
  • Uses announcements instead of beaconing, to eliminate the need for alteration.
  • Enables end-to-end encrypted messages using layer 3 encryption
  • Software integrates with 3rd party hardware (e.g., Digi ConnectPort X4)
  • Development Status

  • U.S. Patent 8607049 issued 12/10/2013
  • DoD 5000 Series Technology Readiness Level 8: System developed, demonstrated, and deployed
  • Field-tested 2012-2013
  • Licensing and collaboration opportunities available
  • Also see T2 publications on custom network protocols and Handheld Network Access Device (HNAD)/Android-based mobile app
  • For more information on technology transfer, please contact us at (619) 5535118 or email
    SD 1239, June 2014. SSC Pacific, San Diego, CA 921525001. Approved for public release; distribution is unlimited.

    SSC Pacific
    Updated: 1/13/2015 8:24 AM EST   Published