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rs888
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Message 1 of 16
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Starting to see increased latency and noise

Hi all.

I am starting see a lot of noise on the downstream channels, I have checked that all of my connections are tight.

The LED ring has failed around the front of the Hub 4, on Gig1 also not sure that it matters. Hub is in router mode for the time being.

Channel 18 has always given me issues. Noise on 1 to 11 is new.

Latency.

My Broadband Ping - VM Gig1 / Hub 4

Logs to follow.

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rs888
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Message 2 of 16
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Re: Starting to see increased latency and noise

Cable Modem Status
Online
DOCSIS 3.1
Primary downstream channel
Locked
SC-QAM
DOCSIS 3.0 channels
31
4
DOCSIS 3.1 channels
1
0

 

3.0 Downstream channels

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

31550000006.09999840.366287QAM2563
11390000007.00000040.946209QAM2561
21470000006.30000340.366287QAM2562
41630000006.09999840.946209QAM2564
51710000005.90000240.366287QAM2565
61790000005.90000240.946209QAM2566
71870000005.80000340.366287QAM2567
81950000005.69999740.366287QAM2568
92030000005.50000040.946209QAM2569
102110000005.30000340.946209QAM25610
112190000005.09999840.366287QAM25611
122270000005.00000040.946209QAM25612
132350000005.09999840.366287QAM25613
142430000005.30000340.366287QAM25614
152510000005.30000340.366287QAM25615
162590000005.80000340.946209QAM25616
172670000006.19999740.946209QAM25617
182750000006.19999738.605377QAM25618
192830000005.90000240.366287QAM25619
202910000005.90000240.366287QAM25620
212990000005.69999740.946209QAM25621
223070000006.19999740.946209QAM25622
233150000006.30000340.366287QAM25623
243230000006.59999840.366287QAM25624
253630000006.40000240.946209QAM25625
263710000006.40000240.366287QAM25626
273790000006.40000240.946209QAM25627
283870000006.09999840.946209QAM25628
293950000006.00000040.946209QAM25629
304030000005.90000240.946209QAM25630
314110000005.69999740.366287QAM25631

 

3.0 Downstream channels

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

3Locked40.366287106100
1Locked40.94620914790
2Locked40.366287160660
4Locked40.946209100540
5Locked40.36628757570
6Locked40.94620926240
7Locked40.366287161370
8Locked40.366287104570
9Locked40.94620942470
10Locked40.94620929460
11Locked40.366287157690
12Locked40.94620900
13Locked40.36628700
14Locked40.36628700
15Locked40.36628700
16Locked40.94620900
17Locked40.94620900
18Locked38.605377270851179675
19Locked40.36628700
20Locked40.36628700
21Locked40.94620900
22Locked40.94620900
23Locked40.36628700
24Locked40.36628700
25Locked40.94620900
26Locked40.36628700
27Locked40.94620900
28Locked40.94620900
29Locked40.94620900
30Locked40.94620900
31Locked40.36628700



3.1 Downstream channelsChannel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)
159964K1880QAM4096759


3.1 Downstream channelsChannel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)
159Locked426.43264872870
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rs888
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Message 3 of 16
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Re: Starting to see increased latency and noise

3.0 Upstream channels

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

15370000047.5205995120 KSym/sec64QAM2
23940000046.7705995120 KSym/sec64QAM4
34620000047.2705995120 KSym/sec64QAM3
46030000048.2705995120 KSym/sec64QAM1



3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1US_TYPE_STDMA0000
2US_TYPE_STDMA0000
3US_TYPE_STDMA0000
4US_TYPE_STDMA0000

 

General Configuration

Network access
true
Maximum Number of CPEs
1
Baseline Privacy
true
DOCSIS Mode
3.1
Config file
ncxv9873254k;fg87dsfd;kfo



Primary Downstream Service Flow

SFID
794
Max Traffic Rate
1200000450
Max Traffic Burst
42600
Min Traffic Rate
0



Primary Upstream Service Flow

SFID
793
Max Traffic Rate
55000270
Max Traffic Burst
42600
Min Traffic Rate
0
Max Concatenated Burst
16320
Scheduling Type
bestEffort

 

Network Log

Time Priority Description

Mon May 24 07:08:54 20214DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Mon May 24 07:08:54 20216DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Wed May 26 12:12:51 20213No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu May 27 19:08:54 20214DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu May 27 19:08:54 20216DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri May 28 15:10:37 20213No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Mon May 31 07:08:54 20214DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Mon May 31 07:08:54 20216DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jun 3 03:35:54 20213No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jun 3 19:08:54 20214DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jun 3 19:08:54 20216DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Fri Jun 4 01:31:48 20213No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Mon Jun 7 07:08:54 20214DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Mon Jun 7 07:08:55 20216DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Wed Jun 9 07:37:41 20213No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jun 10 19:08:55 20214DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jun 10 19:08:55 20216DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Mon Jun 14 07:08:55 20214DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Mon Jun 14 07:08:55 20216DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jun 17 03:10:40 20213No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jun 17 19:08:55 20214DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jun 17 19:08:55 20216DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Sat Jun 19 07:52:36 20213No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Mon Jun 21 07:08:55 20214DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
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legacy1
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Message 4 of 16
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Re: Starting to see increased latency and noise

Looks ok maybe you did a upload between 9pm-10pm? packets buffer as hub don't do QoS.

if your was not uploading or downloading at the time maybe a DoS or utilisation problem.

---------------------------------------------------------------
rs888
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Message 5 of 16
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Re: Starting to see increased latency and noise

Between 9 and 10pm last night was just normal Youtube and Twitch streaming.

Still seeing T3 timeouts which are not being reported on the main log.

Snapshot with T3 and spikes from this morning to now.

My Broadband Ping - VM Gig1 / Hub 4

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Zak_M
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Message 6 of 16
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Re: Starting to see increased latency and noise

Good afternoon @rs888 

 

I have taken a further look over the account, all the power levers are where they are supposed to be. There is nothing on the network to indicate that this is the issue. 

 

The hub hasn't been rebooted for 9 days, please could you pinhole set the hub. 

 

Kind regards,

Zak_M

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rs888
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Message 7 of 16
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Re: Starting to see increased latency and noise

Hi Zak_M.

I have done the pinhole reset as requested yesterday. It's the red line on the BQM snapshot.

My Broadband Ping - VM Gig1 / Hub 4

Unfortunately the reset has not made any difference with the increased latency and noise I am currently seeing.

Updated logs to follow.

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rs888
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Message 8 of 16
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Re: Starting to see increased latency and noise

3.0 Downstream channels

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

11390000006.69999740.366287QAM2561
21470000006.19999740.946209QAM2562
31550000005.80000340.366287QAM2563
41630000005.90000240.946209QAM2564
51710000005.69999740.946209QAM2565
61790000005.59999840.946209QAM2566
71870000005.50000040.946209QAM2567
81950000005.40000240.366287QAM2568
92030000005.19999740.946209QAM2569
102110000005.09999840.946209QAM25610
112190000005.00000040.946209QAM25611
122270000004.80000340.946209QAM25612
132350000004.80000340.366287QAM25613
142430000005.00000040.366287QAM25614
152510000005.00000040.946209QAM25615
162590000005.50000040.946209QAM25616
172670000005.80000340.366287QAM25617
182750000005.80000338.605377QAM25618
192830000005.50000040.366287QAM25619
202910000005.50000040.366287QAM25620
212990000005.19999740.946209QAM25621
223070000005.59999840.366287QAM25622
233150000005.80000340.366287QAM25623
243230000006.09999840.366287QAM25624
253630000005.90000240.366287QAM25625
263710000005.80000340.366287QAM25626
273790000005.80000340.946209QAM25627
283870000005.69999740.946209QAM25628
293950000005.50000040.366287QAM25629
304030000005.30000340.366287QAM25630
314110000005.09999840.946209QAM25631



3.0 Downstream channels

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

1Locked40.3662877180
2Locked40.9462092460
3Locked40.3662872080
4Locked40.9462096040
5Locked40.946209630
6Locked40.9462091460
7Locked40.9462093380
8Locked40.3662877540
9Locked40.946209400
10Locked40.9462091470
11Locked40.9462092420
12Locked40.94620900
13Locked40.36628700
14Locked40.36628700
15Locked40.94620900
16Locked40.94620900
17Locked40.36628700
18Locked38.6053773343206183
19Locked40.36628700
20Locked40.36628700
21Locked40.94620900
22Locked40.36628700
23Locked40.36628700
24Locked40.36628700
25Locked40.36628700
26Locked40.36628700
27Locked40.94620900
28Locked40.94620900
29Locked40.36628700
30Locked40.36628700
31Locked40.94620900



3.1 Downstream channelsChannel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)
159964K1880QAM4096759


3.1 Downstream channelsChannel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)
159Locked425.31013294850
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rs888
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Message 9 of 16
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Re: Starting to see increased latency and noise

3.0 Upstream channels

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

13940000047.7705995120 KSym/sec64QAM4
24620000048.2705995120 KSym/sec64QAM3
35370000048.7705995120 KSym/sec64QAM2
46030000049.2705995120 KSym/sec64QAM1



3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1US_TYPE_STDMA0010
2US_TYPE_STDMA0000
3US_TYPE_STDMA0000
4US_TYPE_STDMA0000

 

Network LogTime Priority Description
Thu Jan 1 00:01:30 19704Missing Mandatory MDD TLV on primary DS Channel;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Thu Jan 1 00:01:50 19703No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Sun Jul 18 19:25:12 20215MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
Sun Jul 18 19:37:26 20215DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1;
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Andrew-G
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Message 10 of 16
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Re: Starting to see increased latency and noise

Your problem appears to me likely to be down to noise ingress on 275 MHz, visible as post-RS (uncorrectable) errors on the downstream, both before and after the restart.   The higher number of pre-RS errors isn't materal as those are corrected on the fly, but the difference between channels confirms what the post-RS data shows.  That frequency could easily be a UHF military radio system, as that frequency is commonly used for airfield comms or approach radars, but that's largely academic as the problem is not the source, but that there's a fault on VM's coax that's allowing that in as radio frequency noise.

And that's what VM need to send out a man to fix.

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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