OFDMA 204 MHz Upstream

Another power hour of cable with Brady Volpe and John Downey CMTS Technical Leader at Cisco, explore 204 MHz in OFDMA deeper with a brief overview of the differences between OFDMA and OFDM.  Also with a discussion on LEO satellites Starlink by SpaceX and answer more questions from our listeners. The discussion is on all things DOCSIS.

OFDMA 204 MHz Upstream:

• General intro
• Low Earth Satellites and the internet
  • Supports gaming
  • Back scatter
  • More satellites than since the dawn of satellites
• Do subscribe and hit the thumbs up
• Huawei 5G
• Poller codes – better error corrections then LDPC
• LDPC – in DOCSIS
• Profile Management tables
• Solarwinds
• 204 MHz split and OFDMA
• DOCSIS 4.0 ESD – 1.8 GHz downstream so we can extend the upstream
• 204 is in the spec today in DOCSIS 3.1 in field now
  • 42 sub split
  • 85 mid split
  • 204 high split
  • 396 ultra split
• 5 times the spectrum
• Leakage testing on 204 MHz upstream
• Send probing signal from cable modem
• The cable modem is the end point and works to identify leakage
• The cable modem is the new prob
• RPD – does it sense the clipping and adjust?
• Digital Return
• BDR
• DAA
• Tilt – what about tilt in 204 MHz upstream?
  • Conditioned taps, flexible solution taps, eq taps
• Upgrade the return plan on tilt at modem
• There is still unity gain at amps
• Upstream inputs flat
• Upstream outputs are tilted
• Improvements in 3.1 vs 3.0 modems SNR
• 48 MHz ODMFA transmit
• DRW
• Diplex filterless Amplifier
• Questions in the chat room
• If you go to 85 MHz do you go to 204 MHz or do you go to DOCSIS 4.0
  • There are pitfalls which are discussed
  • Subscribers do not understand why cable cannot offer gig up and down and only offer gig down.
• What portion of the wide OFDMA does the CMTS use to determine the power level of the OFDMA?
• Good question
• How are the power levels really negotiated?
• The IR can be set were you want
• 6.4 MHz, find ranging, to hit CMTS flat
• A lot going on there
• Get rid of legacy set top boxes – IP video – All MPEG 2 video
• RFOG and running OFDMA – not recommended
• IP TV – think of your strategy now

End Podcast

John thank you for your time today. This was a great episode.  Our next Episode 70 in January 15th.

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