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DOCSIS 3.1 Channel Maximum Speed
Sorry if similar questions have been answered elsewhere. I have checked here, and many outside sources but the answer is unclear. I am hoping someone on this forum might know. I have a CM1000v2 modem with 16 bonded QAM256 channels. What is my maximum download speed? Info I have found suggests the maximum speed per channel is around 42.88 mbps, which should imply a maximum around 686 mbps. Note this number seems to match my actual download speed (usually a bit under this). However, this speed is much slower than my promised ISP (Mediacom) speed of 1 gig. I would just like to confirm that I have no chance of reaching 1 gig with 16 bonded QAM256 channels. Please see attached for any additional information that may be needed to answer. Thanks in advance for the help.
10 Replies
Who is your ISP?
Most 1Gb services need or require all 32 channels and docsis 3.1 to be used to be able to achieve 1Gb on the down. Anything less then that would probably not see 1Gb. Something to talk to your ISP about.
The CM modem is well capable of 1Gb services on the down side when 32 channels are being used.
- The ISP in this case is Mediacom. They insist that I am able to get 1gig with this configuration, but I do not. So I am looking for confirmation that it is not possible. And also to confirm if my info on channels and speed is correct.
What are speed are you seeing with a wired PC connected to the back of the modem using Ooklas installable speed test app?
Possible the ISP is combining or compressing speeds into half the channels. Something you might want to check with the Cable Labs and the DOCSIS 3.1 specs.
