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Walton_Nick
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Upstream Dropoff

New (8 weeks ) VM user.  Ultimate Oomph Level - M600.
Consistently get 600Mb/s Download 24hours a day.  The issue is upstream speeds.
I get between 40-45 Mb/s in the morning, but after 12:00, the speed drops to something between 5-0.2 Mb/s.  This is a massive problem as I work from home running courses that require a video link with no stutter!

I've hard reset the router to modem mode, with the PC connected via Cat6 direct.
An engineer is visiting on Wednesday 6th Jan 2021, but I would like an idea where to direct him for a quick resolution.

Attached are the log files.

Item Status Comments

Acquired Downstream Channel (Hz)
402750000
Locked
Ranged Upstream Channel (Hz)
60300588
Locked
Provisioning State
Online

 

 

Upstream bonded channels

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

16030058841512016 qam1
23940004941.3512016 qam4
34619934741.8512016 qam3
45370022541.8512016 qam2



Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA0010
2ATDMA0000
3ATDMA0000
4ATDMA0000

 

General Configuration

Network access
Allowed
Maximum Number of CPEs
1
Baseline Privacy
Enabled
DOCSIS Mode
Docsis30
Config file
cmreg-vmdg505-bbt078+voc-b.cm



Primary Downstream Service Flow

SFID250474
Max Traffic Rate690000278
Max Traffic Burst42600
Min Traffic Rate0



Primary Upstream Service Flow

SFID250473
Max Traffic Rate44000278
Max Traffic Burst42600
Min Traffic Rate0
Max Concatenated Burst42600
Scheduling TypeBestEffort

 

Network Log

Time Priority Description

02/01/2021 18:53:38noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
30/12/2020 14:51:40criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/12/2020 21:35:29Warning!LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/12/2020 03:23:40criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
26/12/2020 23:54:33ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
24/12/2020 21:58:1criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
23/12/2020 11:54:33ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/12/2020 22:34:45criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/12/2020 16:23:19Warning!Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/12/2020 16:23:15criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/12/2020 16:23:15Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/12/2020 16:23:15criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/12/2020 16:23:14Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/12/2020 12:35:15criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
20/12/2020 08:05:9ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
16/12/2020 17:32:16criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
16/12/2020 02:44:6ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
14/12/2020 21:28:14criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/12/2020 14:44:5ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
10/12/2020 00:10:50criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

 

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Andruser
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Re: Upstream Dropoff

Looks like upstream noise, given that all four upstream channels have dropped back to 16 QAM.  A technician should be able to fix that.  However, given the time-related aspect there's a possibility that it is network congestion issue and if that's the case then the technician can't fix that. 

In the meanwhile, setup a BQM, and post a link to a live, shared graph, and we can take a view on any possible congestion, and advise accordingly.

 

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Walton_Nick
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Re: Upstream Dropoff

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Andruser
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Re: Upstream Dropoff

It'll take 24 hours to give a clear view, but on the basis of the first hour or so it doesn't look like over-utilisation, which is a good thing - hopefully we can be more specific tomorrow.

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Walton_Nick
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Re: Upstream Dropoff

Interesting, for the first time in two weeks this evening my upstream datarate is about 30Mb/s.
checking the config, one of the upstream channels is now set to 32 qam.
How easy is it for the onsite engineer to change to 64 qam, or can this be done by someone at the NMC?

Upstream bonded channelsChannel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
16030000041512016 qam1
23940000041.3512032 qam4
34620000041.8512016 qam3
45370012742512016 qam2


Upstream bonded channelsChannel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1ATDMA0010
2ATDMA0000
3ATDMA0000
4ATDMA0000
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gitty
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Re: Upstream Dropoff

The QAM level is determined by the amount of noise in the return path. How easy it is to fix depends on how long the guy needs to search for the reason for it. 🙂
Andruser
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Re: Upstream Dropoff

...and upstream noise could explain the low levels of packet loss visible on the BQM, as well as latency spiking.  On the BQM, I'm not concluding that there's a material over-utilisation issue, and would currently attribute the very modest day time worsening to the impact of the noise issue.  I'll flag this for forum staff to advise.

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Corey_C
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Re: Upstream Dropoff

Thanks for your post and for reaching out to the Community Forums, Walton_Nick, 

 

Sorry to see that you have been having internet issues, I've run some remote diagnostic and it's showing you already have a visit book for internet issues, you can find your appointment here.

 

Cheers,

Corey C

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Walton_Nick
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Re: Upstream Dropoff

Corey,

Thanks. Engineer been onsite and has said that its a Network Engineer issue as he can't fix a QAM problem. 

He will escalate to them.... is this right?

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Walton_Nick
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Re: Upstream Dropoff

OH **bleep**!

Just had an engineer arrive unannounced at my house.  My son answered the door and was informed that it was not a network issue and that my router has "Defaulted".  I was on a work call and within the 2 minutes that I managed to end the call the engineer had left!

Now what the [REMOVED] is going on? I have a 16 QAM upstream link that is wrong and an engineer that seems to have closed the active fault without consultation with the bill payer.  I am really not impressed.  I am not a noob at this stuff

Can someone tell me how I can resolve this?

 [MOD EDIT: Inappropriate language removed, please review the Forum Guidelines]

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