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J0s3
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Frequent drops - No Ranging Response Received

Hi,

I have been having frequent drops of internet access for a number of weeks. I have tried a number of times to reset and restart the router, but the issue persists. It happens on all devices, and it seems to be the internet, as wifi still appears to be working. Below are the logs. Any help would be appreciated. Just a note, the drops in connectivity appear to be more frequent than what is shown in these logs, if that’s what they show. 

Time Priority Description

14/12/2020 08:16:5noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/12/2020 19:26:50criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/12/2020 14:51:42noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2020 06:04:20criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/12/2020 01:30:43noticeDHCP Renew - lease parameters tftp file-cmreg-vmdg505-bbt078+voc-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

 

 

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Z92
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Re: Frequent drops - No Ranging Response Received

Can you post the other tabs, the upstream and downstream too? 

J0s3
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Re: Frequent drops - No Ranging Response Received

Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1218750000-2.235256 qam11
2138750000-0.734256 qam1
3146750000-0.735256 qam2
4154750000-0.735256 qam3
5162750000-0.735256 qam4
6170750000-0.935256 qam5
7178750000-135256 qam6
8186750000-0.935256 qam7
9194750000-1.235256 qam8
10202750000-1.735256 qam9
11210750000-1.935256 qam10
12226750000-2.535256 qam12
13234750000-2.735256 qam13
14242750000-335256 qam14
15250750000-3.935256 qam15
16258750000-335256 qam16
17266750000-2.235256 qam17
18274750000-1.735256 qam18
19282750000-1.536256 qam19
20290750000-1.536256 qam20
21298750000-1.536256 qam21
22306750000-1.436256 qam22
23314750000-136256 qam23
24322750000-0.736256 qam24



Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1Locked35.716890
2Locked34.9297750
3Locked35.577180
4Locked35.545170
5Locked35.744140
6Locked35.547842
7Locked35.544880
8Locked35.521630
9Locked35.76650
10Locked35.530600
11Locked35.739010
12Locked35.543240
13Locked35.730310
14Locked35.718650
15Locked35.740120
16Locked35.736840
17Locked35.518440
18Locked35.78120
19Locked36.33210
20Locked36.63710
21Locked36.34090
22Locked36.32580
23Locked36.61580
24Locked36.31140
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J0s3
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Re: Frequent drops - No Ranging Response Received

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

13940006542.8512064 qam4
24620000042.8512064 qam3
35370000442.8512064 qam2
46030002942.8512064 qam1


Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA0040
2ATDMA0010
3ATDMA0030
4ATDMA0030
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Z92
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Re: Frequent drops - No Ranging Response Received

It does appear that you might have a small amount of noise on the upstream channels, but I wouldn't expect this to cause frequent drops but rather slower speeds than normal when these noise events occur. Since this noise ingress can also appear from neighbouring cables they can be very tricky to track down, and if intermittent, almost impossible. 

Do you have the same problems when you are connected to the router via a cable? If so, I would check all your connections and ensure they are all hand tight and look in good order. 

 

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J0s3
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Message 6 of 7
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Re: Frequent drops - No Ranging Response Received

Speeds are often as shown (should have 600Mbs, but the highest I ever get to see is 72Mbs). Is that something that an engineer can look into? 

49613695-A7D9-463F-AF4B-572B5A511AF8.png

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Z92
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Message 7 of 7
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Re: Frequent drops - No Ranging Response Received

WiFi speeds can't be guaranteed or trusted, you should use a good quality ethernet cable connected directly to the router to determine your best speed. 

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