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DOCSIS CMTS Best Practices and Recommendations Part 2

Episode 27 DOCSIS CMTS Best Practices Recommendations – Today is April 14 and this is episode 27 of Get You Tech On, our show on All Things DOCSIS.  I’m Brady Volpe, Founder of The Volpe Firm and Nimble This.   With us is the a man who is world famous for carrying two 10ks up an Ecuadorian mountain side, John Downey, CMTS Technical Leader at Cisco Systems, welcome John thanks for coming back again. Today’s episode is a good one.  This is part 2 on our DOCSIS CMTS Suggestions, Best Practices and Recommendations.  DOCSIS CMTS Best Practices Recommendations

So the focus of our show today is – Part 2 and some questions from the mailroom.

Questions from the mailroom:

Jerry  writes – Could you recommend acceptable Upstream Codeword error ratio, correctable ratio, uncorrectable ratio?

  1. per cable modem
  2. per upstream channel

 

Manuel writes – I have nodes working over 40 to 42 dBs in SNR

I am working with 16 QAM modulation on the upstream

I have a few Questions

If those nodes vary from 42 to 35 dB in SNR and the cable modems don’t have any substantial flaps and the UP MER is over 35

According to my experience I shouldn’t have any problems.

I think I don’t but some people say that my SNR should be flat with no variation

Other question

Which are the limits on variation in SNR as long as you don’t fall in the threshold

 

Irfan –

Hi Guys,

Just feel free to answer this question to me as detailed as possible within your valued time.

I am working on deploying 6.4 MHz ATDMA project. We only have 15-30 MHz spectrum in the region so with this limitation decided to do 2 3.2 ATDMA channels and 1 6.4 ATDMA, I bounded these three channels into one upstream bonding group and a test D3.0 Modem hooked up in Headend came online and working.

My question how the load –balancing with work on upstream channels having different width and bounded in one US bonding group. I am under the impression that they would just load balance equally across all bonded three upstream. Hence D3.0 will not do proper load-balancing. Am I right? If not then how, and what I can do best to optimize my mac-domains that have different width upstreams bonded.

Thanks,

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[slideshare id=75099435&doc=hangoutjanuary2720174slides-170417174829]