Technology Questions Answered SNR, OFDMA and more

In this episode Brady Volpe of Nimble This and The Volpe Firm, and John Downey (of Cisco) answer viewers questions about upstream SNR / Diplex filters / OFDMA / ICFR

Want to know what might be interesting and useful to you? Join in on the discussion and ask questions in the chat in another power hour of cable and the discussion on all things DOCSIS and beyond. Give us a thumbs up if you like her content.

The discussion is on all things DOCSIS. Tips, suggestions and recommendations. Another power hour of cable.

Your questions, our answers: Brady Volpe and John Downey discuss issues from listeners:

• Issues with Upstream SNR Due to Diplex Filter
• Subscriber A / Subscriber B problem
• DOCSIS 2.0 Modems Intermittent on an 85 MHz plant
• Why do we call a cable modem haystack a “haystack”?

Timeline:

• 00:00 Intro
• 3:25 Q1 Issues with Upstream SNR Due to Diplex Filter
• 6:20 OFDMA using Over-ride IUC (or Exception Band)
• 8:01 Diplex filter example
• 10:18 Pre-equalization roll-off example
• 11:17 Solutions to Q1 Issues with Upstream SNR Due to Diplex Filter
• 14:23 Q2 Subscriber A impacted by Subscriber B off of Same Tap – why?
• 16:21 Tap port isolation
• 22:40 Q3 DOCSIS 2.0 Modems Intermittent on an 85 MHz plant
• 28:48 Solutions for Q3 DOCSIS 2.0 Modems Intermittent on an 85 MHz plant
• 29:38 Cable Modem Steering
• 33:12 Why do we call a cable modem haystack a “haystack”?
• 37:18 Why do we get significant correctable errors on DOCSIS 3.1?
• 41:55 Open port on taps – to terminate or not to terminate?
• 46:01 Any reason for OFDMA to be at a level other than 0 dBmV?
• 49:20 Why does upstream ICFR look inverted?
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• End Podcast

Thank you for your time today. This was a great episode.  Our next Episode 83 in July.

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