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In this episode Brady Volpe of Nimble This and The Volpe Firm, and John Downey (of Cisco) elaborate on how to use PNM tools to identify house amps, Cable Modems with filter issues, etc. So houses can be identified with incompatible filters for intended UpStream spectrum deployments.

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Identify house amps, Cable Modems with filter issues:

  1. Intro
  2. In home impairments
  3. We do not troubleshoot from the back of the cable modem
    1. Splitters
    2. Digital taps
    3. Echo Cavity
    4. Insertion Loss
    5. Return Loss
  4. 24 Pre-Equilizer taps
  5. ICFR or peak to valley
  6. Cable modem hay stacks
  7. In PNM if you see ICFR it’s in-home
  8. Two way splitter – finger tight twist on F connector
  9. +3 dB peak to valley to + or -1 dB peak to valley
  10. Group Delay
  11. MTC
  12. In home Amp 85 MHz Return
    1. in home amps at subscribers residence
    2. 42/54 MHz diplex filter
    3. Impaired service
    4. ICFR impairments
    5. Cable Modem in partial mode
    6. Before you activate 85 MHz
    7. Pre-EQ runs out of runway – upstream channel
  13. Subscriber Drops getting Kinky
    1. Standing wave and filters
    2. FBC
    3. J-Hock
    4. Corrosion on connector – echo cavity
    5. FM ingress
  14. Trap filter issues
    1. Traps for blocking video channels for data only customers
    2. Lots of these video traps out there
    3. Find the traps – Who remembers where they are?
    4. Use Full Band Capture to find these traps
    5. Traps block OFDM
    6. Upgrade to 3.1
  15. Low RF Signal due to Lose Connector issues
    1. One Subscriber’s in home issues can impact more then one subscriber
    2. Suck Out
    3. Intermittent issue
    4. Shielding issue
    5. return path ingress
    6. Green lines – intermittent modem report
    7. Yellow lines – non-main tap
    8. Lose connectors
      1. RF signals low
      2. FBC
  16. Low Levels impact RxMER
    1. Roll-Off
    2. Perfect Tilt
    3. Bad data
    4. 1024 QAM?
    5. Ignore 10%
    6. Level of OFDM channel
    7. RF levels and RF noise get effected the same via attenuation
  17. 204 MHz

End Podcast

Thank you for your time today. This was a great episode.  Our next Episode 80 in February.

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