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d_an9641
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Latency Spikes

Hi all,

Just wondered if someone would be able to give be some advice. I've felt like my broadband connection quality has severely been affected recently for the last few months. I've read a few other forum posts and set up a BQM linked below and it seems to have quite a few latency spikes. (At the time of writing, compared to the current graph there have been many times in the past where there have been even more dropped packets)

I have already tried getting a new hub 3.0 but this hasn't really made a difference.

I have also tried using my own router with the hub 3.0 in modem mode but this seemed to make the problem worse so I sent that back.

I think my router status looks ok? Though, I have on occasion seen some of the upstream channels change to 32 QAM.

Just in case it has any relevance, I do happen to have one of those mains powered booster splitters which was fitted a few years ago by an engineer after some of the equipment in our street seemed to have issues where the signal used to cut out, particularly when it rained. As far as I am aware,however, the issue has been fixed.

Is this over utilisation in my area? And/or is there something I can do about this?

Any thoughts/advice would be much appreciated.

Thanks!

 

https://www.thinkbroadband.com/broadband/monitoring/quality/share/299447c7f7563751417bf83e3aab616467... 

 

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d_an9641
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Re: Latency Spikes

 

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

12270000000.437256 qam12
21390000005.637256 qam1
3147000000537256 qam2
41550000004.837256 qam3
51630000004.537256 qam4
6171000000437256 qam5
71790000003.437256 qam6
8187000000337256 qam7
91950000002.437256 qam8
102030000001.537256 qam9
112110000000.737256 qam10
122190000000.237256 qam11
13235000000137256 qam13
14243000000137256 qam14
152510000000.737256 qam15
162590000000.437256 qam16
17267000000037256 qam17
18275000000037256 qam18
19283000000037256 qam19
20291000000036256 qam20
21299000000-0.236256 qam21
22307000000-0.736256 qam22
23315000000-0.936256 qam23
24323000000-0.537256 qam24



Downstream bonded channels

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

1Locked37.36040
2Locked37.3186150
3Locked37.3170113
4Locked37.618075
5Locked37.321935
6Locked37.319934
7Locked37.315735
8Locked37.616631
9Locked37.322311
10Locked37.327121
11Locked37.345922
12Locked37.358613
13Locked37.64003
14Locked37.63492
15Locked37.654511
16Locked37.390013
17Locked37.315700
18Locked37.321610
19Locked37.625870
20Locked36.633020
21Locked36.651240
22Locked36.386272
23Locked36.690580
24Locked37.364130

 

 
Upstream bonded channelsChannel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
15370000042.3512064 qam10
23940000040.8512064 qam12
34620000040.8512064 qam11
46030000042.3512064 qam9


Upstream bonded channelsChannel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1ATDMA0070
2ATDMA0040
3ATDMA0020
4ATDMA0060

 

Network access
Allowed
Maximum Number of CPEs
1
Baseline Privacy
Enabled
DOCSIS Mode
Docsis30
Config file
d;kfoA,.iyewrkldJKDHSUBsg



Primary Downstream Service Flow

SFID12403
Max Traffic Rate230000061
Max Traffic Burst42600
Min Traffic Rate0



Primary Upstream Service Flow

SFID12399
Max Traffic Rate22000061
Max Traffic Burst42600
Min Traffic Rate0
Max Concatenated Burst42600
Scheduling TypeBestEffort

 

 

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d_an9641
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Re: Latency Spikes

Network Log

Time Priority Description

20/12/2020 06:13:9criticalNo Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
19/12/2020 20:09:5noticeDHCP Renew - lease parameters tftp file-cmreg-vmdg505-bbt060-b.cm modified;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
19/12/2020 20:09:5ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
19/12/2020 15:17:54criticalNo Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
17/12/2020 13:54:11noticeLAN login Success;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
17/12/2020 13:53:58Warning!LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
16/12/2020 08:16:46criticalNo Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
16/12/2020 08:09:4noticeDHCP Renew - lease parameters tftp file-cmreg-vmdg505-bbt060-b.cm modified;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
16/12/2020 08:09:4ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
14/12/2020 19:58:34criticalNo Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
14/12/2020 18:26:2noticeLAN login Success;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
14/12/2020 13:41:10criticalNo Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
13/12/2020 19:57:55noticeLAN login Success;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
12/12/2020 22:22:54criticalNo Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
12/12/2020 20:09:4noticeDHCP Renew - lease parameters tftp file-cmreg-vmdg505-bbt060-b.cm modified;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
12/12/2020 20:09:4ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
12/12/2020 20:07:27criticalNo Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
12/12/2020 13:05:8noticeLAN login Success;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
10/12/2020 12:09:47criticalNo Ranging Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
09/12/2020 11:09:53noticeLAN login Success;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;

 

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MikeRobbo
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Alessandro Volta
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Re: Latency Spikes

Firstly, your BQM is showing that you are in an area of quite high utilisation; only VM can do anything about it.

Secondly, your Downstream Power Levels individually are all within spec but, the differential between the lowest at -0.9dBmV and the highest at +5.6dBmV is too great.

This will need an engineer to put right.

You can either call in (08:00 is the best time) or wait on here for a few days (6 to 10 days average) until one of the VM Forum Staff comes along.

If you wait on here Do Not bump the thread it will put it further down the VM 'to do list'.

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

12270000000.437256 qam12
21390000005.637256 qam1
3147000000537256 qam2
41550000004.837256 qam3
51630000004.537256 qam4
6171000000437256 qam5
71790000003.437256 qam6
8187000000337256 qam7
91950000002.437256 qam8
102030000001.537256 qam9
112110000000.737256 qam10
122190000000.237256 qam11
13235000000137256 qam13
14243000000137256 qam14
152510000000.737256 qam15
162590000000.437256 qam16
17267000000037256 qam17
18275000000037256 qam18
19283000000037256 qam19
20291000000036256 qam20
21299000000-0.236256 qam21
22307000000-0.736256 qam22
23315000000-0.936256 qam23
24323000000-0.537256 qam24

 


*********************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************
BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.
d_an9641
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Re: Latency Spikes

Hi MikeRobbo

Thank you for your response. I did think the wide range of power levels was a bit strange. I tried the text messaging service however haven't had any luck with getting through to anyone as of yet so I was really hoping someone from the team would see my post. I am happy to be patient considering everything going on at the moment, though im worried I may have been forgotten 😞

Out of interest, what would an acceptable differential be? Is it likely to be caused by a damaged cable or something?

 

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MikeRobbo
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Helpful Answer

Re: Latency Spikes

I honestly don't know the cause of wayward power levels. The max differential is 3.0DbMv.


*********************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************
BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.
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d_an9641
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Re: Latency Spikes

Just an update on this.

I did finally manage to get through to someone though the text messaging service. Unfortunately they cannot book an engineer for me as apparently there is a fault in my area (though there isn't anything shown on the service status). They have said it should be fixed by the 6th of Jan so I suppose i'll have to wait and see.

Strangely, the power levels seem to be rising with the highest now being 7.3dBmV and the lowest being 1.4dBmV. Also ive seen the upstream drop to 32qam more frequently. I assume this is part of the issue, but likewise, will have to wait and see.

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d_an9641
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Re: Latency Spikes

Hi All

Just a further update on this. VM seemed to rectify the area fault on the 6th and it was good for a while and the latency spikes seemed to decrease too.

I think possibly they shifted me on to a different range of channels as the channel IDs for the downstream were different after they worked on it?

However on the 15th it seems VM pushed out a software update to my hub and since then the differential in downstream power levels has returned and as have the latency spikes. The old channel IDs have returned too.

Is there a way I can reverse this or does an engineer need to be called out again?

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d_an9641
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Re: Latency Spikes

Also separate issue that may be of interest to someone else, the day the engineer was working on it my WIFI SSID magically changed to the number 1. Not sure why this was or if it was for the engineer to identify my hub or something.

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