Long term VERY BAD internet issues. No idea what else to do.

Halpwithinternet

Reputable
Aug 15, 2014
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4,510
Hey guys,

I'm going to be as thorough as possible. I'll preface this by saying that I have very limited knowledge about computers..so expect some dumb sounding stuff.

For about a year now my internet has been horrible. I play online games and I get lag spikes all of the time..it makes everything 100% unplayable. I'm on a wired connection, and both of the computers connected to the modem experience the same problem.

I have:

Replaced my modem over 10 times, different brands, different everything. Same problem with them all.
Had a tech come out to the house to replace the lines in and out of the house/replace all of our chords + modem while he was here.
Run every virus scan in the world (Can that even cause it?)
Taken every computer/router/vonage device/powerstrip/everythingelse out of the equation and just had my computer plugged into the modem plugged into the wall
Bought an expensive modem
and much more I'm sure

For about a year now my lag has been consistant pings until random HUGE spikes for anywhere to 5 seconds to a minute...and the spikes could come either every hour , every 5 minutes, TOTALLY random. The only time I've had releif from this was when we had a snow storm here, the internet got wiped in the area, the techs came out and fixed the area and then after that I had about three months of the internet working perfectly. Since then I have changed nothing, but one day it just started being horrible again.

However, the past month it's been different. I did a chat with comcast and for the first time in a year of dealing with these people he said that he noticed that our modem had some "crazy errors, crazy red lights showing and something about bad SNR" and that he just had to do some sort of sync and update (totally have forgotten what he called it) and he claimed that would fix my problem. For about 5 hours after we did that it I had no issues with my internet which isn't rare. I can go hours without it blipping once. However, ever since then my lag has completely changed. Now, instead of the major spikes before , now I get full on disconnects..and there are two different kinds.

One in my cmd ping test looks like this :

30
30
30
request timed out
Request timed out
request timed out
30
30
30

and the other is many many lines of the request timed out until I get the yellow triangle of doom bottom right over my connection icon, and it only fixes when I do the troubleshooting and it comes up with a "Could not connect to local dns server or local something" error. From what I've read about that, that's a false error that comes up and really it's just my connection dropping for a huge amount of time.

Anyways, I've tried everything I can here and I really need some help. I'm not savvy enough to fix this myself and I feel like I've tried everything.

The three types of lag I've experienced in the past year are :

Super ping spikes up to 3k/5k, totally crazy for a short amount of time, then it dies down for a random amount of time...then comes back

Jittery lag every second, 100% constant: 30, 150, 30, 120, 130, 30 (this one is super rare and only happened after that sync thing that guy did two times)

Total disconnect lag where I have to fix it with the troubleshooting .

The interesting thing about the third one is that every single time ...and I mean EVERY time it does this, it either does exactly 3 lines of "request timed out", or it does the total disconnect. Every single time it's the same amount. That is literally the only consistent thing I can see. Everything else is totally random. Not a specific time of day, not a specific day of the week.

Also have : Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=30:60:23:6f:e0:e6;CMTS-MAC=00:01:5c:32:3a:c6;CM-QOS=1.1;CM-VER=3.0; on my modem event log. No idea if that means anything.

It might also be worth noting that usually if I do a modem reset, or get a refresh signal sent I get relief for a little bit. Sometimes for 30 minutes, but sometimes it fixes it for the rest of the evening. Might be a total coincidence....but as I said this problem is just so random its hard to troubleshoot :/

Sorry if this is too long winded, but I just really really need some help here and am trying to say everything I can. Let me know if I'm missing anything obvious.

Thanks in advance for any help, I really need it. I'm unable to make business calls from my home phone because the internet is cutting out constantly and I can't do anything gaming related. (I've removed the vonage deviced from the equation, it's not the cause of it)
 
Solution
You did a uni-cast..
Can you check the power levels of the incoming cable line feed to the modem via the modem. Look at the CH locks and voltage, any ch that has a drift of 3 to 5mv
Depending on how your house is wired.
Meaning if you have mode than one wall box from Comcast in your house.
To connect Either a cable box or, cable modem.
Inside each of them is a Signal splitter.
Off the main line each box has such a thing, if it has two thread type points on it.
Inside the box is the signal splitter or devider.
Now every time you divide of the main feed via these it drops it divides the signal lock strength, and voltage required.
SNR signal noise is normal too low to achieve a good quality signal lock and transmission.
Based on...
You did a uni-cast..
Can you check the power levels of the incoming cable line feed to the modem via the modem. Look at the CH locks and voltage, any ch that has a drift of 3 to 5mv
Depending on how your house is wired.
Meaning if you have mode than one wall box from Comcast in your house.
To connect Either a cable box or, cable modem.
Inside each of them is a Signal splitter.
Off the main line each box has such a thing, if it has two thread type points on it.
Inside the box is the signal splitter or devider.
Now every time you divide of the main feed via these it drops it divides the signal lock strength, and voltage required.
SNR signal noise is normal too low to achieve a good quality signal lock and transmission.
Based on frequency.
Your cable modem tunes its self to a set amount of frequency`s and locks to them.
But if the SNR is to high or, low it cannot lock properly to the bands it needs.
So you get signal drop outs, poor internet and lag spikes.

You most likely need to remove one of the splitters from the inside of the comcast wall mount inside the house.

Join the cable with this.

http://www.ebay.co.uk/itm/F-Plug-Satellite-TV-Connector-Female-Female-Coupler-x10-/230590042038?_trksid=p2054897.l5660

By removing it the voltage and signal quality becomes stronger, and the SNR will be better.

They should of tested at each wall point what the power, and SNR was coming from it. removed the splitter and determined if the internal divides were too much for the equipment to adequately obtain a good lock of the bands required.

Here. look at SNR.

Lock Status Channel ID Frequency Modulation Rx Power SNR Pre RS Errors Post RS Errors
Locked 81 267000000 Hz QAM256 2.4 dBmV 40.7 dB 9281 47
Locked 82 275000000 Hz QAM256 2.4 dBmV 40.4 dB 9214 7
Locked 83 283000000 Hz QAM256 2.3 dBmV 40.3 dB 10533 735
Locked 84 291000000 Hz QAM256 2.3 dBmV 40.3 dB 9715 273
Locked 85 299000000 Hz QAM256 2.9 dBmV 40.0 dB 16668 4590
Locked 86 307000000 Hz QAM256 2.6 dBmV 40.0 dB 8897 1300
Locked 87 315000000 Hz QAM256 2.1 dBmV 38.2 dB 6373 17
Locked 88 323000000 Hz QAM256 1.4 dBmV 39.4 dB 6939 24


All locked should be in the 40 to 39 db.
If yours shows less on a ch hz then too much noise power needs boosting.




 
Solution


That all makes a lot of sense. I will try that for sure. Thanks! :)

In terms of my power levels, heres all the information like that. Not sure exactly what is important so I'll just throw it all out there:

Downstream:

1 Locked QAM256 1 543000000 Hz 0.5 dBmV 37.6 dB 129 169
2 Locked QAM256 2 549000000 Hz 0.6 dBmV 37.5 dB 120 85
3 Locked QAM256 3 555000000 Hz -0.6 dBmV 37.1 dB 163 89
4 Locked QAM256 4 561000000 Hz 1.0 dBmV 37.8 dB 154 73
5 Locked QAM256 5 567000000 Hz 0.6 dBmV 37.8 dB 149 85
6 Locked QAM256 6 573000000 Hz 1.7 dBmV 37.8 dB 128 67
7 Locked QAM256 7 579000000 Hz 0.7 dBmV 37.8 dB 110 214
8 Locked QAM256 8 585000000 Hz 1.0 dBmV 37.5 dB 124 243


upstream:

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 10 5120 Ksym/sec 27900000 Hz 46.5 dBmV
2 Locked ATDMA 9 5120 Ksym/sec 34800000 Hz 46.5 dBmV
3 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

Is that what you wanted?
 


"You most likely need to remove one of the splitters from the inside of the comcast wall mount inside the house.

Join the cable with this."

If I do that you think that will resolve the issue?

Would the dbmv being too low really cause this amount of craziness in my connection? Its pretty extreme.

Ahhh I'm excited! I hope you're right. This has been so aggravating.
 


You're a hero. I appreciate your help so much! Thanks Shaun. You da best 😛