Telecom Requirements for Time and Frequency ... - GPS.gov
Telecom Requirements for Time and Frequency ... - GPS.gov
Telecom Requirements for Time and Frequency ... - GPS.gov
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Meeting Sync <strong>Requirements</strong> in <strong>Telecom</strong>• UTC accuracy <strong>and</strong> stability brought into network generallywith GNSS <strong>and</strong> local oscillator– Short term stability depends on local oscillator– Hold-over also depends on local oscillator– E.g. holding 1 microsecond <strong>for</strong> a day cannot be done with a Quoscillator• GNSS requires an antenna <strong>and</strong> sky view. Vulnerability is anissue• <strong>Time</strong> <strong>and</strong> frequency sync is often spread from the receiverthrough the network– Network elements add noise <strong>and</strong> errors in various <strong>for</strong>ms– Passing 1 microsecond time sync is hard, limited by distance
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