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ruarirhodes
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Unstable connection

I'm getting a very unstable connection that seems to have worsened in the last few weeks. If I run a speed check it reliably shows 100mb down/10mb up, yet video calls drop out all the time and everything slows to a crawl for a few minutes. I'm seeing the same results on multiple devices, and it doesn't seem to change with distance to the hub. Any help appreciated, data below:

Downstream bonded channels

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

13307500004.440256 qam25
2202750000440256 qam9
32107500004.140256 qam10
4218750000438256 qam11
52267500003.738256 qam12
62347500003.538256 qam13
72427500002.738256 qam14
82507500003.538256 qam15
92587500004.440256 qam16
102667500004.340256 qam17
112747500004.140256 qam18
122827500004.140256 qam19
132907500004.338256 qam20
14298750000440256 qam21
15306750000440256 qam22
16314750000440256 qam23
173227500004.140256 qam24
183387500004.540256 qam26
19346750000440256 qam27
203547500003.740256 qam28
213627500003.740256 qam29
223707500003.540256 qam30
233787500003.238256 qam31
243867500003.240256 qam32



Downstream bonded channels

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

1Locked40.37275113360
2Locked40.3705449692
3Locked40.321927108382
4Locked38.9747072780
5Locked38.6514717458
6Locked38.93283094413
7Locked38.93430392388
8Locked38.63979285535
9Locked40.34680677632
10Locked40.36333859991
11Locked40.37466045448
12Locked40.97970138934
13Locked38.98414933228
14Locked40.38739825980
15Locked40.39045720868
16Locked40.38837814609
17Locked40.38093212817
18Locked40.3660569248
19Locked40.9559258777
20Locked40.34876310248
21Locked40.3401119845
22Locked40.3336209784
23Locked38.9314219353
24Locked40.3266828264

 

 

Upstream bonded channelsChannel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
14620000049.3512064 qam1
22580000050.5512064 qam4
33260000050.3512064 qam3
43940000049.8512064 qam2


Upstream bonded channelsChannel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1ATDMA0090
2ATDMA00340
3ATDMA00280
4ATDMA00400

 

 
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ruarirhodes
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Re: Unstable connection

Network Log

Time Priority Description

08/09/2021 23:10:49noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/09/2021 08:33:45criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/09/2021 07:40:56ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:26criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:15Warning!Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:11Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:11criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:11Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:10criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:19Warning!Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:18criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:15Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:15criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:14Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:14criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:14Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:12:7Warning!Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:12:5criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:12:2Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:12:2criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
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lotharmat
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Message 3 of 11
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Re: Unstable connection

Upstream looks to be out of spec - far too many T3 timeouts.

When was the last time the hub was rebooted as the T3s and PostRS errors are cumulative.



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

ruarirhodes
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Message 4 of 11
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Re: Unstable connection

Thanks for taking a look. I believe last restart was ~1 week ago - I do usually reboot if it's really playing up, but I rarely notice an improvement. I restarted it a couple of hours ago, new data below:

Downstream bonded channels

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

13307500003.740256 qam25
22027500003.740256 qam9
32107500003.738256 qam10
42187500003.538256 qam11
52267500002.938256 qam12
62347500002.740256 qam13
72427500002.540256 qam14
82507500003.438256 qam15
92587500003.940256 qam16
102667500003.740256 qam17
112747500003.540256 qam18
122827500003.540256 qam19
132907500003.738256 qam20
142987500003.538256 qam21
153067500003.540256 qam22
163147500003.540256 qam23
173227500003.540256 qam24
18338750000438256 qam26
193467500003.540256 qam27
203547500003.240256 qam28
21362750000340256 qam29
223707500002.740256 qam30
233787500002.738256 qam31
243867500002.740256 qam32



Downstream bonded channels

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

1Locked40.360
2Locked40.360
3Locked38.980
4Locked38.950
5Locked38.660
6Locked40.360
7Locked40.300
8Locked38.970
9Locked40.350
10Locked40.360
11Locked40.340
12Locked40.360
13Locked38.960
14Locked38.940
15Locked40.340
16Locked40.350
17Locked40.350
18Locked38.950
19Locked40.350
20Locked40.350
21Locked40.360
22Locked40.350
23Locked38.9130
24Locked40.310

 

Upstream bonded channels

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

14620000049.5512064 qam1
22580002951512064 qam4
33260000050.5512064 qam3
43939997650512064 qam2



Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA0010
2ATDMA0010
3ATDMA0020
4ATDMA0000

 

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ruarirhodes
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Re: Unstable connection

 

Network Log

Time Priority Description

09/09/2021 01:27:4criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/09/2021 23:10:49noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/09/2021 08:33:45criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/09/2021 07:40:56ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:26criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:15Warning!Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:11Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:11criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:11Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 05:50:10criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:19Warning!Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:18criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:15Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:15criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:14Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:14criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:44:14Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:12:7Warning!Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:12:5criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/09/2021 02:12:2Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
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ruarirhodes
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Message 6 of 11
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Re: Unstable connection

Not sure if helpful but I've also set up a broadband quality monitor:

https://www.thinkbroadband.com/broadband/monitoring/quality/share/f52dc0d242a91773d434d70e93ec7a9d74993993
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Andrew-G
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Message 7 of 11
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Re: Unstable connection

BQM looks OK since 10pm ish last night, but the problem looks to be an upstream noise issue, judging by the very high upstream power levels and the nature of messages in the network log. 

One thing to try would be to undo and remake all coax connections between hub and wall box and any VM TV boxes?  Undo them, wipe them, reconnect and fasten any nuts finger tight, remembering that each time you interrupt connection it will take about seven minutes for the hub to come back online.  If you're feeling keen you can do the same in the brown Omnibox on the outside wall, although you'll usually need a screwdriver to open it, and to have no fear of either spiders or the dubious workmanship sometimes revealed.

The high downstream error counts could be a result of the poor upstream connection, or have a common cause such as a faulty joint.  If it is a network problem, then possibly this has now been resolved, but as a general rule problems "cured" by a reset or restart will only be temporary improvements and if that proves to be the case then you'll need a technician visit to sort things out. 

Let us know how things go, if needed the forum staff can book you a technician.

 

ruarirhodes
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Message 8 of 11
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Re: Unstable connection

~10pm last night I restarted the router after getting no service at all for about 5 mins. This morning I re-made all of the coax connections as suggested, including outdoors (box is held together with a single cable tie and full of ends of old wiring so that doesn't inspire confidence). No real difference I'm sad to say; been at a crawl for the last few minutes.

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Tom_F
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Message 9 of 11
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Re: Unstable connection

Hi ruarirhodes, thanks for getting in touch.

 

Apologies for the ongoing issues. When running checks from here I can confirm what Andrew-G has helpfully advised, there are some issues with the upstream power levels that will require the attention of an engineer. 

 

Please get back to me via PM and we'll be able to get that sorted for you.

 

Tom 

ruarirhodes
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Message 10 of 11
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Re: Unstable connection

Thanks Tom, have messaged.

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