Today we are going to discuss Plant Balancing in a Distributed Access Architecture (DAA)

Hello Everyone. This is episode 58 of Get Your Tech On, our show on All Things DOCSIS. I’m Brady Volpe, Founder of The Volpe Firm and Nimble This. John Downey is with me today. John is CMTS Technical Leader at Cisco Systems, welcome John.

Upstream balancing and design, but it’s focused on Distributed Access Architecture (DAA) and eventual 204 MHz.

Address Downstream:

• Downstream sweepless sweep is the easy solution when spectrum fully used and no matter if analog or DAA.
• Generate RF signals without paying a license to use as test signals, but SC-QAM stops at 999 and OFDM stops at 1.2 GHz and I can’t find a way to activate without paying.
• Silicon also supports 2-4 pilots (test tones) and SC-QAMs can be set for CW mode as well.
• Balancing from a sweep trace is much better than balancing on a few tones/chs.

ESD/D4.0 1.8 GHz (RF is sexy again)

• How do we qualify existing plant for extended spectrum before we deploy? No signal out there and CMTS silicon stops at 1.2 GHz.
• How do we address leakage on Downstream if US is 204, 300, 396 MHz?
• Utilize D.1 US probing to generate “signal” from house.
• Deploy nodes and amplifiers with Downstream notch (quad-plexer idea) to allow leakage tone and STB OOB.
• Upstream unity gain means it doesn’t matter what level I use for actually balancing as long as it’s the same.
• The actual level is generated from the CMs and it will be dictated by the CMTS US config and padding right at the CMTS Upstream port in the HE.
• Padding input of the laser is actually better for less laser ingress power and subsequent clipping.
• What happens when more traffic and Upstream spectrum usage along with D3.1 OFDMA and power loading
  • Distributed Access Architecture (DAA) eliminates laser clipping, but A/D compressions could still occur

End Podcast
John thank you for your time today. This was a great episode. Our next Episode 59 on May 6th at 2pm.

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Thank you so much for being here and we will see you next month.

We do our best to bring our audience great technical content every month. You can watch us live on the air or catch our recorded episodes on YouTube, on our volpefirm.com/events channel or download our audio only version with your favorite podcatcher.

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Thank you so much for being here and we will see you next month. 

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