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Forum Discussion
CM1200 intermittent connection issues.
I have had my ISP send out technicians multiple times now and they have checked signals on the coaxial cables and replaced fittings outside the house and within. They also checked my ethernet cable running to my router. I also replaced my router with a brand new Nighthawk WIFI 7 router recently to see if that would help. CM 1200 was purchased and installed 6 months ago. Technicians have been at a loss for what's wrong.
Firmware Version V3.02.01
ISP: Midco
Time Priority Description
Wed Sep 25 23:18:09 2024 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=********;CMTS-MAC=********;CM-QOS=1.1;CM-VER=3.1;
Wed Sep 25 23:17:53 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=********;CMTS-MAC=********;CM-QOS=1.1;CM-VER=3.1;
Firmware Version V3.02.01
ISP: Midco
Time Priority Description
Wed Sep 25 23:18:09 2024 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=********;CMTS-MAC=********;CM-QOS=1.1;CM-VER=3.1;
Wed Sep 25 23:17:53 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=********;CMTS-MAC=********;CM-QOS=1.1;CM-VER=3.1;
12 Replies
Your power levels are low. They should be between +7 dBmV and -7 dBmV. For reference, see the first three sentences at the top of this article: https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router.
It would be very helpful if you would flesh out your term "intermittent connection issues" with some details. Such as connection via Wi-Fi or connection via Ethernet? Connections to what specifically? Is there some action you take to remedy the situation or just wait it out?
If the connection is via Wi-Fi, do you have lots of close by neighbors with Wi-Fi devices or are you out in the county by yourself?
the power levels are low and you have a ton of errors.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
If you can, simply connect the modem right where the coax comes into the home. This prevents wiring in the home from being the issue. And some ISP’s charge if the wiring issue is in the home. So this helps prevent this.- Thanks Plemans,
The technicians checked the coax for everything you're mentioning here and replaced all the connectors just in case.
- That's interesting about the power level because when the technician checked coaxial right at the modem he said everything looked fine. But yeah that's obvious it's a weak signal.
More detail:
For both wifi (like our phones) and ethernet connections (like our "cable" boxes) there will be 30sec to several-minute connection drops that happen maybe 10 or so times an hour. If we wait the connection comes back automagically.
We do have a lot of close neighbors nearby, but as I mentioned we experience this with devices that are wired in as well like our living room cable box.
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended.- Update here: As suggested by someone else I did do a hard reset of the modem. That has not solved anything.
I spoke with my next door neighbor on thursday, who has the same provider. He has been having similar connection issues but no where near as often as me. He drops connection maybe once or twice a day where I'm at over 50 times a day now.
I had a 2nd technician come out on Friday to try troubleshooting. He had already noticed the neighbors situation but also noted that they are no where near our situation.
He found nothing unusual with any of his tests of the calling but still changed all connectors just in case. He then replace the line running to my house with a temporary one just in case the one that is buried is bad.
My connection was improved for most of Friday after his visit, although I was still seeing T3 connection errors they were less frequent. But as the evening wore on it for progressively worse.
As of today, I'm trying to watch the Vikings game and i have had so many connection drops/buffering that I'm 45+ minutes behind on the game broadcast. Connection is dropping for 2-3 minutes every minute or so. This now almost at an unusable point.
Any ideas?Something to get the ISP to take a close look into. If your still having problems and power levels, event logs and such are still seeing issues, ISP needs to resolve that.
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
Airguard6 wrote:
Update here: As suggested by someone else I did do a hard reset of the modem. That has not solved anything.
I spoke with my next door neighbor on thursday, who has the same provider. He has been having similar connection issues but no where near as often as me. He drops connection maybe once or twice a day where I'm at over 50 times a day now.
I had a 2nd technician come out on Friday to try troubleshooting. He had already noticed the neighbors situation but also noted that they are no where near our situation.
He found nothing unusual with any of his tests of the calling but still changed all connectors just in case. He then replace the line running to my house with a temporary one just in case the one that is buried is bad.
My connection was improved for most of Friday after his visit, although I was still seeing T3 connection errors they were less frequent. But as the evening wore on it for progressively worse.
As of today, I'm trying to watch the Vikings game and i have had so many connection drops/buffering that I'm 45+ minutes behind on the game broadcast. Connection is dropping for 2-3 minutes every minute or so. This now almost at an unusable point.
Any ideas?The technicians you have had visit are home technicians. The problem is where the line to the home connects to the main line in the street. You need a line technician to make adjustments at the main line tap.
Who is your ISP?
Keep on them until they get it fixed. Your bill is still coming due each month.
