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Xfinity DOCSIS 3.1 How many bonded channel your modem sees?

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Frequent Visitor

Xfinity DOCSIS 3.1 How many bonded channel your modem sees?

Hi Folks,

I just upgraded my modem to DOCSIS 3.1 (Neatgear CM1000, approved by Comxast) and upgraded Xfinity service to 1GB Internet. 
Max speed measured by Comcast Speed Test is ~600+Mbit/s (down) and ~32+Mbit/s (upload)
I have no complaints about upload -looks exsiting but download generates a question...
I've checked modem status and saw only one OFDM channel locked (with healthy power = +10dBmV and SNR ~40dB) and 13 channels locked to QAM256 (with reasonable power levels -5...+9dBmV; SNR = 37..42dB)
Questions:
- How many channels Xfinity reserved for DOCSIS 3.1 1GB Internet?  (OFDM and/or bonded QAM?)

- Why I see QAM256 channels not QAM4096 channels specified by DOCSIS3.1?

- Does Xfinity REALLY provides DOCSIS 3.1 1GB Internet to me ($100/month) or I may switch back to cheaper 600Mbit/s plan with the same result?
Thank you, MK


  

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Expert

Re: Xfinity DOCSIS 3.1 How many bonded channel your modem sees?

FWIW, there is currently only one DOCSIS 3.1 / OFDM channel with which the gigabit speed tier is delivered by. One has more than enough bandwidth to deliver the theoretical speed.



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Frequent Visitor

Re: Xfinity DOCSIS 3.1 How many bonded channel your modem sees?

Hi EG,

Thank you for reply! Yes, one OFDM - that's what I thought. Unfortunately it doesn't deliver downoad higher than 600-650Mbit/s on my side. Even if computer hardwired (no WiFi, no USB adapters!) to the modem LAN output, no external router involved 😞