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Shankarhokie
Rousing Reactor
Expressive Exchange
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Contributor

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58 Messages

Wednesday, April 15th, 2020 6:00 PM

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daily restart of modem

I am in the 600MBps band and used to clock around 700Mbps at all times. 

Once the recent work from home in MI started, the speed slows down to 6Mbps or even slower. I have to restart the modem to get back to decent speed. I have to do this multiple times a day.

Noting much has changed in terms of modem/router, #connected devices. Same number of devices as during the weekend when we all connect our laptops & phones.

 

Why is this happening & what is the remedy?

Question

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Updated 

4 years ago

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EG

Expert

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111.7K Messages

5 years ago

What do the modem's signal stats look like ? Try getting them here http://192.168.100.1 or here http://10.0.0.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

What is the exact make and model number of the modem ?

Is this a WiFi connection ?

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Shankarhokie

Contributor

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58 Messages

5 years ago

Noticing a lot of time sync issues!

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EG

Expert

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111.7K Messages

5 years ago

The signal stats were o/k at that snapshot in time. Are there any RF error / event log entries being shown ? If so, please post them too.

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Shankarhokie

Contributor

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58 Messages

5 years ago

It is a LAN via ethernet.  It is connected to the back of a Netgear Orbi router.

 

Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
9 Locked QAM256 531000000 Hz 4.8 dBmV 40.6 dB 0 0
2 Locked QAM256 489000000 Hz 5.2 dBmV 40.8 dB 0 0
3 Locked QAM256 495000000 Hz 5.4 dBmV 41.0 dB 0 0
4 Locked QAM256 501000000 Hz 6.1 dBmV 41.1 dB 0 0
5 Locked QAM256 507000000 Hz 5.8 dBmV 41.2 dB 0 0
6 Locked QAM256 513000000 Hz 6.0 dBmV 41.1 dB 0 0
7 Locked QAM256 519000000 Hz 5.9 dBmV 41.0 dB 0 0
8 Locked QAM256 525000000 Hz 5.2 dBmV 40.9 dB 0 0
10 Locked QAM256 537000000 Hz 3.9 dBmV 40.4 dB 0 0
11 Locked QAM256 543000000 Hz 5.2 dBmV 40.9 dB 0 0
12 Locked QAM256 549000000 Hz 5.6 dBmV 40.6 dB 0 0
13 Locked QAM256 555000000 Hz 5.6 dBmV 40.8 dB 0 0
14 Locked QAM256 561000000 Hz 5.8 dBmV 40.9 dB 0 0
15 Locked QAM256 567000000 Hz 6.3 dBmV 41.0 dB 0 0
16 Locked QAM256 573000000 Hz 6.7 dBmV 41.1 dB 0 0
17 Locked QAM256 579000000 Hz 6.8 dBmV 41.2 dB 0 0
18 Locked QAM256 585000000 Hz 6.1 dBmV 40.8 dB 0 0
19 Locked QAM256 591000000 Hz 5.9 dBmV 40.7 dB 0 0
20 Locked QAM256 597000000 Hz 5.9 dBmV 40.7 dB 0 0
21 Locked QAM256 603000000 Hz 6.2 dBmV 40.6 dB 0 0
22 Locked QAM256 609000000 Hz 6.1 dBmV 40.7 dB 0 0
23 Locked QAM256 615000000 Hz 6.4 dBmV 40.6 dB 0 0
24 Locked QAM256 621000000 Hz 7.0 dBmV 40.8 dB 0 0
25 Locked QAM256 627000000 Hz 6.9 dBmV 40.8 dB 0 0
26 Locked QAM256 633000000 Hz 7.1 dBmV 40.8 dB 0 0
27 Locked QAM256 639000000 Hz 7.1 dBmV 40.9 dB 0 0
28 Locked QAM256 645000000 Hz 7.6 dBmV 41.1 dB 0 0
29 Locked QAM256 651000000 Hz 7.5 dBmV 41.0 dB 0 0
30 Locked QAM256 657000000 Hz 7.8 dBmV 41.1 dB 0 0
31 Locked QAM256 663000000 Hz 7.8 dBmV 41.1 dB 0 0
33 Locked QAM256 669000000 Hz 7.8 dBmV 41.1 dB 0 0
37 Locked Other 690000000 Hz 7.3 dBmV 39.2 dB 26523347 0



 
Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 5 Locked SC-QAM Upstream 39800000 Hz 1600000 Hz 42.0 dBmV
2 4 Locked SC-QAM Upstream 16600000 Hz 6400000 Hz 43.0 dBmV
3 3 Locked SC-QAM Upstream 23000000 Hz 6400000 Hz 42.0 dBmV
4 2 Locked SC-QAM Upstream 29400000 Hz 6400000 Hz 42.0 dBmV
5 1 Locked SC-QAM Upstream 35800000 Hz 6400000 Hz 42.0 dBmV



 

Current System Time: Mon Apr 20 11:02:26 2020

 

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Shankarhokie

Contributor

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58 Messages

5 years ago

Thanks Eg. I'll await a message

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Shankarhokie

Contributor

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58 Messages

5 years ago

The modem is Arris SB8200

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EG

Expert

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111.7K Messages

5 years ago

Even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) somewhere.

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.


I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.

You should get a reply here in your topic. Good luck !

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CCChe

Official Employee

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6.9K Messages

5 years ago

Hi @Shankarhokie, 

We appreciate you for posting to the Xfinity Forums! Sorry for the connectivity issues you're having. I agree with @EG. Let's chat in a private message so I can gather your account information and begin to check for issues at the node. Please send me a private message with your full name, the name of the account holder, and the house number of your address, so I can assist you. To send a private message, click on "ComcastChe" and then click send a message.   

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Customer-D

New Poster

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3 Messages

5 years ago

I've had the same issue and have a similar post. However, it still has not been resolved even after 2 modems and a new line put in. I am not sure what the issue is, but I haven't called back because I haven't had the time to spend with them. It takes literal hours to accomplish anything and still have nothing resolved.

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Shankarhokie

Contributor

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58 Messages

5 years ago

Communicating with ComcastChe.

 

 

Any idea why my modem would have a 1970 time stamp? Seems like a lot of folks with intermittent connection issues have the same T3 error with 01/01/1970 timestamp.

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Shankarhokie

Contributor

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58 Messages

5 years ago

Directly connected to modem. Here are the power and SNR

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
9 Locked QAM256 531000000 Hz 7.0 dBmV 41.0 dB 235 94
2 Locked QAM256 489000000 Hz 6.9 dBmV 41.1 dB 220 71
3 Locked QAM256 495000000 Hz 6.9 dBmV 41.1 dB 189 68
4 Locked QAM256 501000000 Hz 7.6 dBmV 41.3 dB 207 66
5 Locked QAM256 507000000 Hz 7.4 dBmV 41.2 dB 246 56
6 Locked QAM256 513000000 Hz 7.5 dBmV 41.1 dB 259 96
7 Locked QAM256 519000000 Hz 7.6 dBmV 41.0 dB 311 96
8 Locked QAM256 525000000 Hz 7.1 dBmV 40.9 dB 269 73
10 Locked QAM256 537000000 Hz 6.3 dBmV 40.7 dB 242 76
11 Locked QAM256 543000000 Hz 7.2 dBmV 40.7 dB 201 51
12 Locked QAM256 549000000 Hz 7.1 dBmV 41.0 dB 167 85
13 Locked QAM256 555000000 Hz 7.1 dBmV 41.0 dB 181 51
14 Locked QAM256 561000000 Hz 7.5 dBmV 40.9 dB 161 56
15 Locked QAM256 567000000 Hz 7.5 dBmV 40.9 dB 152 63
16 Locked QAM256 573000000 Hz 7.5 dBmV 40.9 dB 232 221
17 Locked QAM256 579000000 Hz 7.9 dBmV 38.8 dB 166 77
18 Locked QAM256 585000000 Hz 8.2 dBmV 41.0 dB 183 56
19 Locked QAM256 591000000 Hz 8.1 dBmV 40.8 dB 186 56
20 Locked QAM256 597000000 Hz 7.7 dBmV 40.7 dB 205 48
21 Locked QAM256 603000000 Hz 8.0 dBmV 40.8 dB 163 52
22 Locked QAM256 609000000 Hz 7.9 dBmV 40.7 dB 207 46
23 Locked QAM256 615000000 Hz 8.1 dBmV 39.4 dB 142 51
24 Locked QAM256 621000000 Hz 8.6 dBmV 40.8 dB 158 29
25 Locked QAM256 627000000 Hz 8.5 dBmV 40.8 dB 154 19
26 Locked QAM256 633000000 Hz 8.7 dBmV 40.7 dB 146 33
27 Locked QAM256 639000000 Hz 8.8 dBmV 40.9 dB 165 34
28 Locked QAM256 645000000 Hz 9.2 dBmV 41.1 dB 167 28
29 Locked QAM256 651000000 Hz 9.1 dBmV 40.9 dB 142 55
30 Locked QAM256 657000000 Hz 9.4 dBmV 41.0 dB 154 57
31 Locked QAM256 663000000 Hz 9.4 dBmV 41.0 dB 184 44
33 Locked QAM256 669000000 Hz 9.4 dBmV 41.1 dB 151 61
37 Locked Other 690000000 Hz 9.3 dBmV 39.2 dB 214138946 45

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Shankarhokie

Contributor

 • 

58 Messages

5 years ago

Upstream

Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 5 Locked SC-QAM Upstream 39800000 Hz 1600000 Hz 41.0 dBmV
2 4 Locked SC-QAM Upstream 16600000 Hz 6400000 Hz 42.0 dBmV
3 3 Locked SC-QAM Upstream 23000000 Hz 6400000 Hz 42.0 dBmV
4 2 Locked SC-QAM Upstream 29400000 Hz 6400000 Hz 41.0 dBmV
5 1 Locked SC-QAM Upstream 35800000 Hz 6400000 Hz 41.0 dBmV


 

 

Current System Time: Tue Apr 21 08:58:00 2020

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Shankarhokie

Contributor

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58 Messages

5 years ago

channel 37.JPGToday, I'm seeing a lot of T6 issues related to hannel 37. @EG had mentioned somewhere that this "Other" channel is related to Gigabit speed tier. I am not on that plan.  So far today, the speed has been stable.

I have also been going back to check any recent software updates/upgrades. Recently, Malwarebytes did a big update and I wondered if that was conflicting with the modem/router firewalls and also possibly Norton Security.  It also added a Malwarebytes ad blocker for the chrome browser. I have disabled Malwarebytes for now. Let me see if things stablize.

 

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EG

Expert

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111.7K Messages

5 years ago

@Shankarhokie wrote:

Communicating with ComcastChe.

 

 

Any idea why my modem would have a 1970 time stamp? Seems like a lot of folks with intermittent connection issues have the same T3 error with 01/01/1970 timestamp.

That's what a modem defaults to using when for whatever reason, when it is having difficulties talking to the T.O.D. (Time Of Day) server.

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Shankarhokie

Contributor

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58 Messages

5 years ago

Update:

 

Hello @ComcastChe  @EG  : After several hours of steady internet speeds, the problem returned with the same error (going to 01/01/1970).  This morning I reset the SB8200 and so far so good. I am awaiting the deep dive results from @ComcastChe 

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