grady777's profile

Contributor

 • 

23 Messages

Friday, January 29th, 2021 8:00 AM

Closed

connection problem

my internet connection works normal but from time to time the connection drops out,  however i look to see the status of my connection & it says connected then it comes but on with in a min or 2.  is this just me or is a comcast issue?  anyone else having this issue???

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Contributor

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23 Messages

4 years ago

i should have added this, has anyone else had this problem if so does changing out the box help??

Expert

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111.4K Messages

4 years ago

Is this with a WiFi connection ? If so, for a test, does a computer / device that is hardwired directly to the router / gateway device with an ethernet cable have the same problem ?


With this test, we are trying to isolate this from being either a WiFi-only problem or a problem with the general connection to the Comcast system which would of course affect both. It's a good first step of troubleshooting before we proceed any further.

Contributor

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23 Messages

4 years ago

its via ethernet

Contributor

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23 Messages

4 years ago

thanks

Contributor

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23 Messages

4 years ago

if thats not the error log where is it on the 10.0.0.1 website?

Expert

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111.4K Messages

4 years ago

The stats are o/k / within specs. Make and model number ?

 

Are there any modem error log entries being shown ? If so, please also post them in their entirety.

Expert

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111.4K Messages

4 years ago

Nevermind.  We've seen many posts here recently indicating that they have now blocked the end-user from accessing the modem component's RF signal error log entries in the Comcast supplied gateway devices. A BIG mistake in my opinion......

 

The signal stats are o/k but 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 will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic. Good luck !

Expert

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111.4K Messages

4 years ago

O/k, start with the modem's signal stats. Perhaps they already are, or they are close to being out of spec and intermittently they go completely of spec. 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 ?


Expert

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111.4K Messages

4 years ago

The SNR numbers were being shown with the downstream channel power levels, and they were good. The codewords were o/k as well. Any error log entries ?

Contributor

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23 Messages

4 years ago

the make i believe is gateway & the model is Cisco DPC3941T

i can't find the signal to noise ratio

 

Contributor

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23 Messages

4 years ago

upstream:

 

IndexLock StatusFrequencySymbol RatePower LevelModulationChannel Type

Upstream
Channel Bonding Value
1
2
3
4
Locked
Locked
Locked
Locked
17 MHz
23 MHz
30 MHz
36 MHz
5120 KSym/sec
5120 KSym/sec
5120 KSym/sec
5120 KSym/sec
47.000 dBmV
45.500 dBmV
47.000 dBmV
45.500 dBmV
64 QAM
64 QAM
64 QAM
64 QAM
ATDMA
ATDMA
ATDMA
ATDMA

 

downstream:

IndexLock StatusFrequencySNRPower LevelModulation

Downstream
Channel Bonding Value
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
531 MHz
459 MHz
465 MHz
471 MHz
477 MHz
483 MHz
489 MHz
495 MHz
501 MHz
507 MHz
513 MHz
519 MHz
525 MHz
537 MHz
543 MHz
549 MHz
555 MHz
561 MHz
567 MHz
573 MHz
579 MHz
585 MHz
591 MHz
597 MHz
40.366 dB
40.366 dB
40.366 dB
40.366 dB
40.366 dB
40.946 dB
40.366 dB
40.366 dB
40.946 dB
38.983 dB
40.366 dB
40.366 dB
40.366 dB
40.366 dB
40.366 dB
40.366 dB
38.983 dB
40.366 dB
40.366 dB
40.366 dB
40.946 dB
38.983 dB
38.983 dB
38.983 dB
-2.500 dBmV
-2.600 dBmV
-2.700 dBmV
-2.800 dBmV
-3.600 dBmV
-3.100 dBmV
-3.000 dBmV
-2.700 dBmV
-2.800 dBmV
-3.100 dBmV
-2.800 dBmV
-3.000 dBmV
-2.600 dBmV
-2.500 dBmV
-2.800 dBmV
-2.800 dBmV
-2.500 dBmV
-2.500 dBmV
-2.600 dBmV
-2.800 dBmV
-2.800 dBmV
-3.200 dBmV
-3.100 dBmV
-3.500 dBmV
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM

Contributor

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23 Messages

4 years ago

where would the error log entries be???

 

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