I am a new customer and have my own cable modem, which is a Netgear CM1000v2. I paid extra for a 3.1 modem to take advantage of the latency queueing capabilities but for some reason, it's not showing the OFDM channels. I've called support and they are oriented towards "break/fix" and based on the download/upload speeds I'm getting (150Mbps down/10Mbps up), and my signal levels, etc, they haven't been able to help me. I'm starting to wonder if DOCSIS 3.1 is availible in my area. I believe the fastest speed in my area is arund 200Mbps. I'm perfectly fine with 150Mbps, but I do really want to take advantage of DOCSIS 3.1 if I can. Or find out if it's not an option for me at this time. And if that's the case, I will stop digging into the issue and wait for an upgrade. I haven't been able to get that information by calling 1st level support and asking for an escalation though.
The Firmware Version of my modem is V6.01.06 and here are the cable modem stats.
|<tabindex=-1>Downstream Bonded Channels</tabindex=-1>|
|<tabindex=-1>Upstream Bonded Channels</tabindex=-1>|
|<tabindex=-1>Downstream OFDM Channels</tabindex=-1>|
|<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>|
I cleared the event logs and rebooted my modem and here's what it shows:
|Time Not Established||Notice (6)||Honoring MDD; IP provisioning mode = IPv6|
|Time Not Established||Critical (3)||No Ranging Response received - T3 time-out;CM-MAC=<masked for security>;CMTS-MAC=<Masked for security>;CM-QOS=1.1;CM-VER=3.1;|
|Time Not Established||Critical (3)||SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=<masked for security>;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;|
Thanks for any help!
Solved! Go to Solution.
I had the same issue with another Netgear modem/router. the issue is related to a firmware update that is pushed out from the ISP (which now has to do all the firmware updates). Unplug the coax or ethernet from the ISP. Push in the factory reset button on the modem (one that you need to use a paperclip, small hole usually next to the power button). Then re-hook the cable or etherent connection. this should resync the ISP and update firmware. Even though I pressed the factory reset button, all of my setting were still there after it reintialized.
Hope this helps. I got the solution from Reddit and not Netgear or Xfinity.
I'm starting to wonder if DOCSIS 3.1 is availible in my area. I believe the fastest speed in my area is arund 200Mbps.
If the Gigabit tier is available in your area, then you have DOCSIS 3.1 service.
From what I can see there doesn't seem to be anything wrong with your signals otherwise.
FWIW, I don't see a DOCSIS 3.1 / OFDM downstream channel being locked on to. You need one in order to be able to get gig speed.
Held the rest button for 5 plus seconds after disconnecting the Coax. It seemed like the cable modem reset a few times but even after a good 40 minutes it came up on firmware version V6.01.06. I know it reset because I couldn't get in at first and tried the original default password, which it took even though I had changed it. Still no OFDM channels, so I may be stuck with 3.0 until they upgrade in my area.
So I had a contact that works on the construction side because I had to have 700 feet of cable bored to my house. I reached out to him and he let me know 3.1 is not availible in my area yet. At least I know I can stop trying to connect to something that isn't there. Plus, I'm ready when it does eventually roll out.
So maybe this will help somebody in the same boat. I thought maybe Comcast had made the switch to 3.1 across the board since it had been around a while, but that is not the case. So if your area only goes to 200Mbps or so, you probably don't have the option to utilize the advanced 3.1 spec yet.