A Dual Tuner DOCSIS 3.0 set-top-box.
Recreate the RF Local Oscillator architecture of the tuner using black-box testing.
- The modem was taken apart and tuner IC identified
- A 256-QAM modulator plus an RF upconverter was used as input signal source
- The RF input signal was split and converted into two balanced signals prior to the two tuner IC inputs.
- A magnetic loop probe was connected to a spectrum analyzer for signal reception
- The tuner was put through various carefully designed test cases and input and output combinations and responses were observed.
Result of Dual Tuner DOCSIS 3.0 set-top-box Test
Successful verification of the overall architecture of the Dual Tuner DOCSIS 3.0 set-top-box, including all the oscillator frequency settings for various channels.
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