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Problems with CM1150V upstream on Comcast Xfinity
There are a number of past threads (now closed, or I'd be replying to them) about problems people have had with the upstream path on a CM1150V with Comcast Xfinity. I believe I understand the underl...
sleat wrote:So it makes sense that the BGA3131 is designed to operate up to 205MHz. However, notice the sentences I've highlighted. In my case, Comcast is running four upstream QAM channels (no upstream OFDM) at frequencies of 173MHz, 273MHz, 303MHz, and 367MHz. So not only are they asking the CM1150V do do something it was never designed to do, they are blatantly violating the DOCSIS 3.1 spec!
sleat I've read this thread multiple times (having my own Upstream Issues!) and took this at face value;
but only just spotted this fundamental error in your analysis ..........
The Comcast Upstream frequencies are not as you indicate, you are a factor of 10 off
i.e. they are 17.3MHz, 27.3MHz, 30.3MHz and 16.7MHz
i.e. 17300000 Hz (5 zeros) = 17,300,000Hz or 17.3MHz
So actually operating well within the DOCSIS 3.1 Spec and well within the design capability of the Chipset.
As I've said I'm having my own Upstream Issues with my CM1150V (and actually got a replacement from Netgear) and there is definitely a problem - but it's not because it's being asked to operate outside its spec.
Exact same problem I am having with mine. Just added tv service and had to add a splitter to main drop as house is not wired for cable. Internet went to crap. Major packet loss. Got the Xfinity modem today in the meantime as I dont want to buy another recommended modem and have the same thing happen. Now have a modem that is a paper weight.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.
Be sure to power OFF the modem for 1 minute them back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853Contact NG support for additonal help and information.
Acnas wrote:Exact same problem I am having with mine. Just added tv service and had to add a splitter to main drop as house is not wired for cable. Internet went to crap. Major packet loss. Got the Xfinity modem today in the meantime as I dont want to buy another recommended modem and have the same thing happen. Now have a modem that is a paper weight.
