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Worringly high latency affecting streaming

CrystalGipsy
On our wavelength

I have been getting issues over the last few months with  streaming where I have never had them before. This is for both video and music and it has got worse since Virgin upgraded me to a Hub 5. I never had issues with music from Qobuz which is not compressed audio like Spotify but now its starting to not play media at all and skips songs. This isnt even high bandwidth material but it is affected by latency. Also video services skip and buffer when I have never had this before. All these devices are hardwired and my network for all local material video and music streamd perfectly so its not this.

Started a TBB Checker and its showing a lot of latency as does my unifi network software. I only use the Hub5 in modem mode. Its never idle during the day as someone is watching something or listening to something, but this seems very high to me and the peaks more or less coincide with the issues I get. I dont seem to be getting drops in speed overall as speed tests still show it being fast.

Here is todays monitor. Was a lot 

c1fc70c38b31e00caf9054d47d378ee62bb97751-11-06-2023.png

Here is log of the router not sure how to read this.

 

Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
11700000006.739QAM 2565
21380000007.639QAM 2561
31460000007.239QAM 2562
41540000007.239QAM 2563
51620000006.939QAM 2564
61780000006.639QAM 2566
71860000006.639QAM 2567
81940000006.639QAM 2568
92020000006.139QAM 2569
102100000006.239QAM 25610
112180000005.639QAM 25611
122260000005.539QAM 25612
132340000005.539QAM 25613
14242000000539QAM 25614
15250000000540QAM 25615
162580000004.739QAM 25616
172660000004.740QAM 25617
182740000004.440QAM 25618
192820000004.340QAM 25619
202900000004.640QAM 25620
212980000004.140QAM 25621
223060000003.940QAM 25622
233140000003.840QAM 25623
243220000003.240QAM 25624
253300000003.440QAM 25625
26338000000340QAM 25626
273460000003.140QAM 25627
283540000002.840QAM 25628
293620000002.740QAM 25629
303700000002.640QAM 25630
313780000002.240QAM 25631

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1Locked39280
2Locked39300
3Locked39440
4Locked39260
5Locked39290
6Locked39260
7Locked39290
8Locked39160
9Locked39190
10Locked39230
11Locked39290
12Locked39200
13Locked39230
14Locked39180
15Locked40270
16Locked39200
17Locked40210
18Locked40170
19Locked40220
20Locked40340
21Locked40190
22Locked40270
23Locked40150
24Locked40330
25Locked40200
26Locked40280
27Locked40310
28Locked40220
29Locked40190
30Locked40180
31Locked40310

 

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
046200000455120QAM 643
13940000044.35120QAM 644
232600000445120QAM 645
325800000435120QAM 646

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
0ATDMA0000
1ATDMA0010
2ATDMA0000
3ATDMA0000
 
 

General Configuration

Network accessMaximum Number of CPEsBaseline PrivacyDOCSIS ModeConfig file
Allowed
1
Enabled
3.1
KDHSUBsgvca69834ncxv98732

Primary Downstream Service Flow

SFIDMax Traffic RateMax Traffic BurstMin Traffic Rate
674
402500089 bps
42600bytes
0 bps

Primary Upstream Service Flow

SFIDMax Traffic RateMax Traffic BurstMin Traffic RateMax Concatenated BurstScheduling Type
673
38500089 bps
42600bytes
0 bps
42600bytes
Best Effort
9 REPLIES 9

legacy1
Alessandro Volta

Test with PC to hub in modem mode no router (power off hub so 2min turn on unplug replug ethernet)

run ping -n 200 194.168.4.100 or setup a new BQM allow ICMP on PC firewall

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CrystalGipsy
On our wavelength

Not possible or practical as it will give everything internally new ip addresses , I run a number of vlans internally that rely on my router and rely on my dhcp fixes ip addresses or they won’t function. I would have to run double Nat and keep my router in the chain.

CrystalGipsy
On our wavelength

Here logs as well. I did turn it off on Saturday to check cabling was ok. 

Time Priority Description
10-06-2023 16:26:15noticeREGISTRATION COMPLETE - Waiting for Operational status
10-06-2023 16:26:09criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
10-06-2023 16:26:07warningREG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
10-06-2023 16:26:01noticeDS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
10-06-2023 16:25:58noticeTLV-11 - unrecognized OID;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
10-06-2023 16:25:56warningDHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
10-06-2023 16:25:53noticeHonoring MDD; IP provisioning mode = IPv4
10-06-2023 16:25:43criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
10-06-2023 16:25:26criticalCable Modem Reboot due to power button reset
05-06-2023 21:42:49criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
05-06-2023 21:42:33criticalCable Modem Reboot due to power button reset
05-06-2023 10:16:21criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
05-06-2023 10:16:03criticalCable Modem Reboot via RG reboot command
05-06-2023 10:00:26criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
05-06-2023 10:00:14criticalCable Modem Reboot via RG reboot command
05-06-2023 09:57:35criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
05-06-2023 09:57:30criticalSYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
05-06-2023 09:57:17criticalCable Modem reset to Factory Default via reset button
 
 

 

jpeg1
Alessandro Volta

Your router stats are perfectly normal - nothing to worry about there. 

Looking at the BQM in your first post, that is a typical display on a moderately busy VM local network. The spike at 12pm might be due to a modem restart or a speedtest running. The latency naturally gets worse over time as VM connects more users. 

I'm not familiar with the Hub5, fortunately, but you are not the first to complain about problems like this. 

- jpeg1
My name is NOT Alessandro. That's just a tag Virginmedia sticks on some contributors. Please ignore it.

yeah using the hub5 in full router mode is giving similar readouts to using it in Modem mode. At the moment I cant reallt use my Qobuz subscription due to the dropouts in playback it is giving me. No idea whats causing this as its really intermittent. It will work for hours and then it wont work properly for 5-10 mins then resumes working as normal. It doesnt seem to happen during the day so much mainly at night and with their higher resolution content not that its much datawise as its audio only.

CrystalGipsy
On our wavelength

Well I ran a streaming loop test yesterday from about 11am till 10.45pm and it only had issues with failing to play stuff around 10.20pm -10.30pm which is about the regualr time it happens during the week and it wasnt for long. Looking at my servers log at the time its getting very little bandwidth from Qobuz at this time, didnt notice any issues with video. As others where streaming and got no issues. 

CrystalGipsy
On our wavelength

Hub5 stopped working completely on its output port in router mode yesterday morning. Never done this when in modem node. It was still working for the BQM so internet was being recieved it was not sending to the connected mode. A reboot of the hub fixed that. 

Changed it back to modem mode last night as its made no difference to the dropouts. Moved the cable to the 2.5ghz port to try it out, not that I get any gains as my router is only 1gb and I only have 350mb/, want to see if the port 1 is the issue or not.

 

 

Hub5 stopped working completely on its output port in router mode yesterday morning. Never done this when in modem node. It was still working for the BQM so internet was being recieved it was not sending to the connected mode. A reboot of the hub fixed that. 

Changed it back to modem mode last night as its made no difference to the dropouts. Moved the cable to the 2.5ghz port to try it out, not that I get any gains as my router is only 1gb and I only have 350mb/, want to see if the port 1 is the issue or not.

 

 

My Broadband Ping - Home


@CrystalGipsy wrote:

Not possible or practical 


Troubleshooting never is practical just do tests with a PC DHCP to hub in modem mode no router because BQM shows nothing wrong apart from some spikes of course BQM is only every 1000ms may not tell the full story.

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