The National Institute of Standards and Technology is...
The National Institute of Standards and Technology is doing tests in New York City of emergency communications in underground tunnels and in “other large, complicated structures, posing a safety hazard for emergency responders,” NIST said Wednesday. “In a series of…
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experiments conducted in New York City, an epicenter of underground tunnels and high-rise buildings, NIST researchers measured path loss, or reduced signal strength, which can occur when signals must travel through thick walls and dense material,” the agency said. “NIST researchers also found that wireless emergency beacons could be unreliable beyond the street-level stairwell entrance to a four-level subway station, and that signal strength depended on the frequency used in the 100-story Empire State Building.” The findings are part of a new report (http://1.usa.gov/Zs0yPB).