METHOD FOR RANGING WITHOUT DOCSIS CHIPSET
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United States of America Patent
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Issued Date -
Nov 14, 2013
app pub date -
May 2, 2013
filing date -
May 2, 2012
priority date (Note) -
Abandoned
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Abstract
A method and test instrument for performing a ranging measurement in a DOCSIS network, uses low cost and general purpose electronics instead of a DOCSIS chipset. A downstream CATV receiver, including a CATV tuner and QAM demodulator, accepts the downstream signals from a CMTS. The output of the demodulator is an MPEG transport stream containing DOCSIS signaling messages and data packets. Software algorithms running inside a suitable general purpose processor decode the MPEG transport stream to isolate signaling messages from the data packets. The signaling messages are used to determine the appropriate format and timing of ranging request messages for the CMTS. A burst generator generates the RF return path messages to be sent to the CMTS, using previously computed waveforms.
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