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For the Xmax referring to loudspeaker driver maximum excursion, see Thiele/Small.

xMax developed by xG Technology, Inc. is a cognitive radio based mobile VoIP and computer networking system operating in the license-free ISM 900 MHz band (902-928 MHz). xMax is built upon an end-to-end Internet Protocol (IP) system infrastructure that includes a line of base stations, mobile switching centers (MSC), handsets and modems.

Performance claims[edit]

A press report was published in 2005 quoting inventor Joseph Bobier.[1] The technology was said to compete with WiMax, but details were initially not disclosed.[2] By 2006, the company announced it had "completed" the technology after six years of development.[3] In 2009, a blogger wrote that he witnessed a xMax mobile VoIP pilot network operated by the company in Fort Lauderdale: "xMax worked well and is real. When you realize that this company may have found a way to take a frequency riddled with wireless garbage and turn it into a fully functioning wireless voice and data network you start to see how much of a game changer this could be for the wireless industry."[4]

  • Antenna: commercially off the shelf antenna
  • Range: typically 2–5 miles depending upon tower height and terrain.
  • Data rate: 18 Mbit/s per basestation
  • Spectrum used: Unlicensed 902-928 MHz band
  • Interference: Ability to accept interference found on 902-928 MHz band
  • Power: Less than 1 W

From 2007 through 2009 Phil Karn published some analysis of the technology claims.[5]


  1. ^ Reuters (July 5, 2005). "xMax: Only broadband in the village?". Archived from the original on July 8, 2005. Retrieved May 30, 2013. 
  2. ^ Guy Kewney (November 9, 2005). "xMax - wireless voodoo? Remarkable claims for WiMAX-busting system". The Register. Retrieved May 30, 2013. 
  3. ^ Chris A. MacKinnon (March 3, 2006). "Get Ready For xMax : xG Goes Beyond The Physical Limits Of Existing Radio Technologies". Processor 28 (9). Retrieved May 30, 2013. 
  4. ^ Rich Tehrani (September 22, 2009). "Rich Takes xMax Wireless for a Test Drive". TMCnet. Retrieved May 30, 2013. 
  5. ^ Phil Karn (October 1, 2009). "xG Technology's xMax". Retrieved May 30, 2013. 

External links[edit]