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Broadbean1
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Wifi drop off - low Dbmv?

Hi, 

I've been with Virgin just over a month and am experiencing frequent drop offs in wifi to the point I where I can no longer take work calls unless I am in the same room as the router. I purchased a Netgear EX7700 extender but this did not help. Have now switched to an Eero Mesh network so the Hub (3.0) is in Modem route. This has improved things as I can now get wifi in all parts of my building (only 90sqm) but when I am in my office the wifi does continue to drop out for about 20 seconds at a time every 5-10 minutes. I have checked the RSSI for my laptop and it ranges between 30-50, I checked for any local issues and am not seeing anything pop up which has led me to believe its something to do with the line coming into my router/modem.  Having looked at the forum I can see that my Dbmv Downstream is low and wonder whether that has something to do with it? 

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Broadbean1
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Re: Wifi drop off - low Dbmv?

Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
14027500001.538256 qam30
22027500002.736256 qam9
32107500002.436256 qam10
4218750000236256 qam11
52267500001.736256 qam12
62347500001.236256 qam13
7242750000136256 qam14
8250750000136256 qam15
9258750000136256 qam16
102667500001.536256 qam17
112747500001.737256 qam18
12282750000237256 qam19
13290750000237256 qam20
142987500001.937256 qam21
153067500001.537256 qam22
163147500001.437256 qam23
173227500001.537256 qam24
18330750000237256 qam25
19370750000237256 qam26
203787500001.737256 qam27
21386750000137256 qam28
22394750000137256 qam29
234107500001.937256 qam31
244187500001.738256 qam32


Downstream bonded channelsChannel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1Locked38.650
2Locked36.370
3Locked36.370
4Locked36.340
5Locked36.360
6Locked36.360
7Locked36.370
8Locked36.3120
9Locked36.650
10Locked36.650
11Locked37.360
12Locked37.670
13Locked37.360
14Locked37.3190
15Locked37.640
16Locked37.3160
17Locked37.650
18Locked37.610
19Locked37.300
20Locked37.340
21Locked37.6100
22Locked37.600
23Locked37.650
24Locked38.950

 

Upstream bonded channels

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

13939998841512064 qam3
22579998139.5512064 qam5
33260000041512064 qam4
44620000241512064 qam2



Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA0000
2ATDMA0000
3ATDMA0000
4ATDMA0000

 

 
 

 

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Z92
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Re: Wifi drop off - low Dbmv?

Your power levels look fine, and there's no indication of any interference.

Can you post the network log too? Maybe that will say something.

Is it possible to also create a BQM so that we can check the internet side of the router?

https://www.thinkbroadband.com/broadband/monitoring/quality

 

Broadbean1
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Re: Wifi drop off - low Dbmv?

See Network Log below: 

See BQM set up here - https://www.thinkbroadband.com/broadband/monitoring/quality/view/3d87aa3e360b0b9971c3e6fd7377a8de149...

Time Priority Description

30/06/2021 08:08:42Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
30/06/2021 07:54:15noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
30/06/2021 07:43:19Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
30/06/2021 07:43:6noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/06/2021 15:29:54criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
29/06/2021 07:38:49noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/06/2021 19:51:2Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/06/2021 22:30:9criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/06/2021 21:24:17criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/06/2021 15:03:56Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/06/2021 09:52:4noticeDHCP Renew - lease parameters tftp file-cmreg-vmdg505-bbt057-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/06/2021 09:52:4ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
25/06/2021 14:17:50criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
25/06/2021 06:44:59Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
24/06/2021 21:18:47criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
24/06/2021 13:36:51noticeDHCP Renew - lease parameters tftp file-cmreg-vmdg505-bbt057-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
24/06/2021 13:36:51ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
24/06/2021 00:31:45criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
22/06/2021 09:50:57noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
22/06/2021 09:35:48Warning!LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
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lotharmat
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Re: Wifi drop off - low Dbmv?

There are a few T3s in the log that could cause the RCS (downstrream) to have partial service - it then sometimes drops all downstream connections and re-negotiates and syncs them.

(Getting a 404 on the BQM)



------------------------------------------------------------------
Hub 3 - Modem Mode - TP-Link Archer C7

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Adduxi
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Re: Wifi drop off - low Dbmv?

If the VM Hub is in Modem mode then it's not the source of the wifi issue.  The power levels are within spec in any case.

You should get a wifi analyser app and check the wifi environment in the house.  You may have to set the wifi bands and channels manually, as some band steering kit can cause small interruptions to wifi during the channel/band moves.

I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more

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Broadbean1
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Re: Wifi drop off - low Dbmv?

Thanks, I’m still getting continued drop offs in one room. The broadband analyser would suggest packet loss but I’m completely out of my depth here. If you have A look at the graph is it something I can resolve or Virgin? 

https://www.thinkbroadband.com/broadband/monitoring/quality/view/3d87aa3e360b0b9971c3e6fd7377a8de149...

 

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lotharmat
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Re: Wifi drop off - low Dbmv?

Still getting a 404 on the BQM!

To share - navigate to the graph page, click 'Share Live Graph', then highlight the 'direct link', copy it then paste it on here!



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Hub 3 - Modem Mode - TP-Link Archer C7

Broadbean1
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Re: Wifi drop off - low Dbmv?

Sorry - see here! 

https://www.thinkbroadband.com/broadband/monitoring/quality/share/a49c68acab735c120ea0e18fb3639b550c3565c6
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lotharmat
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Re: Wifi drop off - low Dbmv?


@Broadbean1 wrote:

Sorry - see here! 

https://www.thinkbroadband.com/broadband/monitoring/quality/share/a49c68acab735c120ea0e18fb3639b550c3565c6

That's the bunny! And Woah!!!!!

Looks like classic over-utilisation!!




------------------------------------------------------------------
Hub 3 - Modem Mode - TP-Link Archer C7