NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
CM1000V2 modem cannot connect computer
CM1000v2 is connected to Optimum cable and Orbi 04 mesh. I am getting increasing frequency where internet drops completely even though the modem shows signal. If I hit the restart on the modem it q...
I will second what plemans says about pulling attenuator.
When you are keeping screen shots of cable connection for records, be sure and include the system uptime at the bottom. The correctables/uncorrectables values accumulate since the last modem boot time. Knowing the time frame the numbers accumulated over is big part of the evaluation. If the numbers are big and you do not know whether they accumulated over a few hours, a few days, or a few months, then it is difficult to put them in perspective.
There are definitely some issues with the channels in the higher frequencies.
The screen shots are time stamped and I identified which one was when the system got restarted and essentially all set back to zero.
I didn't look at how the channels are increasing by frequency. Yes the problems are at the high frequencies - there is a definite distribution of errors at the 603 MH level with the primary channel (if I assume the one listed as 1 is such - id 28)
Here is a question - now I see the "Frequency Start Value" which I can enter any value.
What is an appropriate one to be putting there or does it matter?
I changed the number and it immediately went to reboot. whoops
Well It now restarted and everything is set to zero on correctable and uncorrectable and the value I tried as starting frequency was ignored. So we have a new beginning set which I can track again.
So now I need to understand what the implication of issues at different frequencies.
NeilU wrote:The screen shots are time stamped and I identified which one was when the system got restarted and essentially all set back to zero. Including the System Up time in the screen shot makes this simpler.
I didn't look at how the channels are increasing by frequency. Yes the problems are at the high frequencies - there is a definite distribution of errors at the 603 MH level with the primary channel (if I assume the one listed as 1 is such - id 28)
Here is a question - now I see the "Frequency Start Value" which I can enter any value.
What is an appropriate one to be putting there or does it matter? Best to leave that alone. Does not change the end information.
I changed the number and it immediately went to reboot. whoops See above.
Well It now restarted and everything is set to zero on correctable and uncorrectable and the value I tried as starting frequency was ignored. So we have a new beginning set which I can track again.
So now I need to understand what the implication of issues at different frequencies.
The laws of physics control that happens at the higher frequencies. The power levels will naturally decrease as the frequency increases. This where your ISP comes in to play and where they have responsibility. There are amplifiers along the path in the ISP distribution system. The amplifiers are grouped to cover four or five channels at a time. The gain on the amplifiers can be adjust by the ISP. This happens remotely from the location where the CMTS (Cable Modem Termination System) is located. In your situation, it looks like a higher frequency amplifier in the path is bad. There can be several of these amplifiers in the path depending on how far you are located from the CMTS.
I did no go back and reread the whole thread. Your coax cable should be RG6. It might show RG6 or series 6 stamped along the edge. If it is older coax, it should be replaced.
Thanks for all the input previously.
I installed a new RG6 cable all the way from input to the modem.
I first installed the 6db - this was a week ago. That yielded a couple of +2 and above with many at about +6 to 7
Later I installed the 10db and now the values were from about -4 to +3.5 after restart. No uncorrectable for almost a day and then on 6th I rebooted and have tracked ever since.
Within a day it started to get errors which would sit for some length of time and then every so often it appeared to do some sort of power shifting and then hold with errors for up to a day or so. The primary highest channel would also jump from maybe -6 to -3.9 to -1.3 and each time maybe hold for half a day or so while the number of uncorrectable codewords would hold and then jump.
The latest attachment is since March 6.
I am going to vacationing for the next week so I won't be able to watch this now and may do a reboot before we leave and revisit in a week.
This is the latest screen shot - The total number of unerrored seems doesn't make sense over time. For a number of days the total codewords were constant across all the channels. Suddenly Channels 27 and 28 were much lower than all the rest which then remained the same continuing until now.
NeilU wrote:Thanks for all the input previously.
I installed a new RG6 cable all the way from input to the modem.
I first installed the 6db - this was a week ago. That yielded a couple of +2 and above with many at about +6 to 7
Later I installed the 10db and now the values were from about -4 to +3.5 after restart. No uncorrectable for almost a day and then on 6th I rebooted and have tracked ever since.
Within a day it started to get errors which would sit for some length of time and then every so often it appeared to do some sort of power shifting and then hold with errors for up to a day or so. The primary highest channel would also jump from maybe -6 to -3.9 to -1.3 and each time maybe hold for half a day or so while the number of uncorrectable codewords would hold and then jump.
The latest attachment is since March 6.
I am going to vacationing for the next week so I won't be able to watch this now and may do a reboot before we leave and revisit in a week.
This is the latest screen shot - The total number of unerrored seems doesn't make sense over time. For a number of days the total codewords were constant across all the channels. Suddenly Channels 27 and 28 were much lower than all the rest which then remained the same continuing until now.
You are making good progress on the signal power levels. There are still a lot of uncorrectable line errors over several days.
The line errors should be the responsibility of the ISP for wiring outside your house.
If you've done what you can, the isp needs to check it.
