Virgin Media Community

[treeoctopus]

Hi

Area 31. Using Router in Modem Mode.

Wired PCs over giga-ethernet.

For the past few months we've been having horrendous lag-spikes/packet loss/ping issues.

In games like Overwatch with their Shift-Ctrl-N for detailed networking you can see the 100% loss - manifests as huge rubber banding or sometimes even disconnects. thinkbroadband makes it look not too bad (I've had a lot worse with red packet loss before on virgin), but it's very real, and making me think of switching

Related perhaps is our video performance. Netflix, Youtube etc very often refuse to go beyond their min bitrate (ie yt = 360p video) - after a second you'd expect it to go to 1080p; it never does. If you force it to 1080p/4k it will then stay there, until the next video, when it drops back to 360p. Infuriating. Netflix is a nightmare as it often gets stuck in grainy 1999 video quality, with no way to force it. 

Can a service rep help please?

Cable Modem StatusItem Status Comments

Acquired Downstream Channel (Hz)	474750000	Locked
Ranged Upstream Channel (Hz)	25800000	Success
Provisioning State	OK	Operational

Downstream  DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8

Frequency (Hz)	474750000	482750000	490750000	498750000	506750000	514750000	522750000	530750000
Lock Status(QAM Lock/FEC Sync/MPEG Lock)	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked
Channel ID	9	10	11	12	13	14	15	16
Modulation	256QAM	256QAM	256QAM	256QAM	256QAM	256QAM	256QAM	256QAM
Symbol Rate (Msym/sec)	6.952000	6.952000	6.952000	6.952000	6.952000	6.952000	6.952000	6.952000
Interleave Depth	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17
Power Level (dBmV)	-0.29	-0.09	-0.17	-0.28	-0.34	-0.54	-0.65	-1.13
RxMER (dB)	35.97	36.17	36.17	36.17	36.84	36.84	36.84	36.61
Pre RS Errors	45661	138853	20263	15821	12909	12807	12826	12307
Post RS Errors	9847	9005	7474	7719	8961	8822	9119	7994

Upstream  US-1 US-2 US-3 US-4

Channel Type	2.0	2.0	2.0	2.0
Channel ID	8	5	6	7
Frequency (Hz)	25800000	46200000	39400000	32600000
Ranging Status	Success	Success	Success	Success
Modulation	64QAM	64QAM	64QAM	64QAM
Symbol Rate (Sym/sec)	5120000	5120000	5120000	5120000
Mini-Slot Size	2	2	2	2
Power Level (dBmV)	45.00	46.25	45.25	44.75
T1 Timeouts	0	0	0	0
T2 Timeouts	0	0	0	0
T3 Timeouts	0	0	0	0
T4 Timeouts	0	0	0	0

Upstream Burst  Req(1) Init Maint(3) Per Maint(4) Adv Short(9) Adv Long(10) Adv UGS(11)

Modulation Type	16QAM	QPSK	16QAM	64QAM	64QAM	16QAM
Differential Encoding	OFF	OFF	OFF	OFF	OFF	OFF
Preamble Length	56	640	384	104	104	104
Preamble Value Offset	652	0	0	716	716	716
FEC Error Correction (T)	0	5	5	10	16	5
FEC Codeword Information Bytes (K)	16	34	34	81	223	86
Maximum Burst Size	0	0	0	3	255	255
Guard Time Size	8	48	48	8	8	8
Last Codeword Length	Fixed	Fixed	Fixed	Shortened	Shortened	Shortened
Scrambler On/Off	ON	ON	ON	ON	ON	ON

[Static]

Upstream and downstream power levels are ok. There’s a large amount of Post RS errors building up.
Could you carry out a pin hole reset (hold it for a full 30 seconds) of the hub and post the network stats again tomorrow?
This should give us an idea of the rate at which they are building up. 

You may need to activate modem mode again after the reset. 

Also check that all the connections from the coaxial cable within your property are at least finger tight. 

[treeoctopus]

thanks, will do 

[treeoctopus]

Couldn't get to this immediately, but see below for results after pinhole reset (30 secs)

Downstream ChannelsLock Status Channel ID Frequency Modulation Rx Power RxMER Pre RS Errors Post RS Errors

Locked	1	410750000 Hz	256 QAM	5.6 dBmV	35.2 dB	957	922
Locked	2	418750000 Hz	256 QAM	5.9 dBmV	35.6 dB	987	976
Locked	3	426750000 Hz	256 QAM	6.1 dBmV	36.0 dB	920	919
Locked	4	434750000 Hz	256 QAM	6.0 dBmV	36.0 dB	312	305
Locked	5	442750000 Hz	256 QAM	6.0 dBmV	35.1 dB	936	936
Locked	6	450750000 Hz	256 QAM	6.2 dBmV	37.1 dB	971	971
Locked	7	458750000 Hz	256 QAM	6.6 dBmV	37.4 dB	961	961
Locked	8	466750000 Hz	256 QAM	6.6 dBmV	35.8 dB	947	947

To reset the Pre and Post RS error counts please use the Downstream screen under the router status screen available from the login page.

Upstream ChannelsLock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate

Locked	8	25800000 Hz	ATDMA	38.3 dBmV	64QAM	6400000 Hz	5120 Ksym/sec
Locked	5	46200000 Hz	ATDMA	39.8 dBmV	64QAM	6400000 Hz	5120 Ksym/sec
Locked	7	32600000 Hz	ATDMA	38.3 dBmV	64QAM	6400000 Hz	5120 Ksym/sec
Locked	6	39400000 Hz	ATDMA	38.8 dBmV	64QAM	6400000 Hz	5120 Ksym/sec

Downstream  DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8

Frequency (Hz)	410750000	418750000	426750000	434750000	442750000	450750000	458750000	466750000
Lock Status(QAM Lock/FEC Sync/MPEG Lock)	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked
Channel ID	1	2	3	4	5	6	7	8
Modulation	256QAM	256QAM	256QAM	256QAM	256QAM	256QAM	256QAM	256QAM
Symbol Rate (Msym/sec)	6.952000	6.952000	6.952000	6.952000	6.952000	6.952000	6.952000	6.952000
Interleave Depth	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17	I=12 J=17
Power Level (dBmV)	5.51	5.79	5.99	5.91	5.91	6.16	6.46	6.48
RxMER (dB)	35.60	35.97	36.17	36.17	35.78	37.09	35.25	37.09
Pre RS Errors	317	331	926	891	928	1035	935	989
Post RS Errors	299	316	924	887	928	1034	934	989

Upstream  US-1 US-2 US-3 US-4

Channel Type	2.0	2.0	2.0	2.0
Channel ID	8	5	7	6
Frequency (Hz)	25800000	46200000	32600000	39400000
Ranging Status	Success	Success	Success	Success
Modulation	64QAM	64QAM	64QAM	64QAM
Symbol Rate (Sym/sec)	5120000	5120000	5120000	5120000
Mini-Slot Size	2	2	2	2
Power Level (dBmV)	38.50	39.75	38.25	38.75
T1 Timeouts	0	0	0	0
T2 Timeouts	0	0	0	0
T3 Timeouts	1	0	0	0
T4 Timeouts	0	0	0	0

Upstream Burst  Req(1) Init Maint(3) Per Maint(4) Adv Short(9) Adv Long(10) Adv UGS(11)

Modulation Type	16QAM	QPSK	16QAM	64QAM	64QAM	16QAM
Differential Encoding	OFF	OFF	OFF	OFF	OFF	OFF
Preamble Length	56	640	384	104	104	104
Preamble Value Offset	652	0	0	716	716	716
FEC Error Correction (T)	0	5	5	10	16	5
FEC Codeword Information Bytes (K)	16	34	34	81	223	86
Maximum Burst Size	0	0	0	3	255	255
Guard Time Size	8	48	48	8	8	8
Last Codeword Length	Fixed	Fixed	Fixed	Shortened	Shortened	Shortened
Scrambler On/Off	ON	ON	ON	ON	ON	ON

PS. Dumb Russians, as soon as the router comes back up lots of:

Sat 02 Feb

09:35 GMT

185.143.221.36

8114

1

TCP- or UDP-based Port Scan

[treeoctopus]

Hi, any chance of someone from VM looking at this please?

[Katie_WT]

Hi there treeoctopus, 

Cheers for your posts and your updates. 

From looking at your readouts we're not able to see any issues. Is the Post RS count still climbing? If so, this may need a technician. 

Cheers