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sciisfun
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constant glitching and dropouts

Hello once again hive mind!

Since the last post (previous post) we've had an engineer come out, adjust our position in the cabinet, and upgrade our router. Our speed has raised (and at times even makes it to 100mb/s) however we have issues where it'll just drop out completely for between seconds and minutes at a time. Kicking devices off the wifi, it disappearing from all devices, and a generic Virgin media ssid connectable, and any devices plugged into the ethernet just showing as no connection to the internet. while I could put up with (begrudgingly), now trying to download large items from google drive, has made it impossible to do, as I can't leave it running overnight without timing out. I've put the logs below in case there's something I've missed, however I have seen on a social app that there are lots of people having issues like this in the area (and have had for some time)

Thanks All

James

Downstream bonded channels

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

14110000005.637256 qam1
24190000005.837256 qam2
34270000005.537256 qam3
44350000005.837256 qam4
54430000005.437256 qam5
64510000005.937256 qam6
74590000005.337256 qam7
84670000005.637256 qam8
94750000005.137256 qam9
104830000005.537256 qam10
114910000005.337256 qam11
124990000005.637256 qam12
135070000005.537256 qam13
145150000005.638256 qam14
155230000005.537256 qam15
165310000005.537256 qam16
175390000005.437256 qam17
185470000005.437256 qam18
195550000005.537256 qam19
205630000005.137256 qam20
215710000005.437256 qam21
22579000000537256 qam22
235870000005.337256 qam23
245950000004.937256 qam24

Downstream bonded channels

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

1Locked37.311241
2Locked37.39510
3Locked37.310310
4Locked37.612450
5Locked37.6102013
6Locked37.67970
7Locked37.620070
8Locked37.68624
9Locked37.69210
10Locked37.676917
11Locked37.612351
12Locked37.67490
13Locked37.69980
14Locked38.66968
15Locked37.69330
16Locked37.613960
17Locked37.67060
18Locked37.69230
19Locked37.67550
20Locked37.68540
21Locked37.66980
22Locked37.310480
23Locked37.67290
24Locked37.613920

Upstream bonded channels

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

14620002445.8512064 qam1
23260005044.8512064 qam3
33940002645.3512064 qam2
42580000044.3512064 qam4



Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA00130
2ATDMA0050
3ATDMA0060
4ATDMA0060

 

Network Log

Time Priority Description

18/07/2021 07:57:25ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
18/07/2021 07:56:57noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/07/2021 07:07:21criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
14/07/2021 19:57:25ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/07/2021 14:20:2criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/07/2021 07:57:25ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
10/07/2021 02:08:3criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/07/2021 19:57:25ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/07/2021 04:10:14criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
04/07/2021 07:57:25ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/07/2021 11:27:11criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
30/06/2021 19:57:25ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/06/2021 13:15:5noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/06/2021 13:13:41Warning!LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/06/2021 07:57:25ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
24/06/2021 08:33:2criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
23/06/2021 19:57:25ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
22/06/2021 22:32:6criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/06/2021 07:57:25ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/06/2021 03:33:25criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
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Andrew-G
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Re: constant glitching and dropouts

Any idea how long the hub had been running when you posted that data? 

Power levels, SNR and modulation all look OK, although the nature of synch errors and partial service problems tends to be intermittent, so sometimes a problem is only obvious when you look at the "right" time.  The network log looks normal to me for a DOCSIS connection - a handful of T3 timeouts are normal, loads are not.

There's some post-RS (uncorrectable) errors on the downstream, and whilst an occasional few are tolerable, what matters is how fast they crop up, likewise the upstream timeout count looks too high.  It has been asked but never answered why the hub can record more T3 errors in the upstream count than the network log shows.  Clustering on upstream channel 1 suggests noise ingress, but 46 kHz is a frequency usually associated with short range civilian uses, plus some military, so could be a VM equipment fault.

You may also want to setup a BQM over at https://www.thinkbroadband.com/broadband/monitoring/quality that'll show what's going on with your VM connection.  Post a LINK to a LIVE, SHARED graph here and we'll see if that shows anything.  Usually needs to run for 24 hours before we can draw reasonable conclusions, but the live graph will continuously update so you can post the link immediately.

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Kath_F
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Re: constant glitching and dropouts

Hi sciisfun,

Thanks for coming back to us on this and apologies to hear that these issues are ongoing.

I've taken a look at the account today at the Hub stats and can see the power levels and signal levels look good. The area cable is looking good too. I can see that the hub has been online for 43 days at the time of me replying to you though so there may well be a number of errors recorded that are from the past. 

Please reboot the hub by switching off at the mains for a few minutes. This should reset things and we can look at this again for you. 

It is also worth setting up the BQM as per Andrew-G's advice so we can monitor the drop outs. 

Thanks,

Kath_F
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