Method and apparatus for measuring round trip delay in a unified optical-coaxial network
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United States of America Patent
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Jan 26, 2016
Grant Date -
Jul 3, 2014
app pub date -
Dec 28, 2012
filing date -
Dec 28, 2012
priority date (Note) -
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Abstract
A method of determining a round trip delay time in a network comprising receiving a gate message allocating a transmission time window; retrieving a first timestamp from the gate message; setting a first clock to the time corresponding to the first timestamp, and wherein the first clock runs synchronously with a second clock recovered from a received data stream; sending upstream, after a time interval comprising a grant start time included in the transmission time window offset by a random delay time, a registration request message, wherein the registration request message includes a second timestamp obtained from the first clock; and determining a round trip delay (RTT) from a time the registration request message is received and the second timestamp.
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