Hub 5 high latency and jitter
This issue only started last week. I noticed I couldn't stream BBC radio stations at 320kbps without constant stops and starts. My Hub 5 is in modem mode connected to a TP Link router and I also noticed the router ethernet LED frequently changing from green to orange. I contacted Virginmedia who said they couldn't find any faults using their speed test because the Hub was in modem mode. I ran the Cisco Real Speed test myself and found very high latency and jitter. after unplugging the Hub for a minute or so (a very quick on/off didn't fix the issue) my latency levels were back down to around 20-25ms and I was happy. Until today when the same symptoms appeared. This time I checked the speed directly at the Hub 5 ethernet output so Virginmedia couldn't blame my router and here are a few measurements I then switched off the Hub for a minute and after restart I measured this So what is going on. I do not want to have to unplug the Hub every few days and the first warning I get of the issue is my morning alarm streaming Radio 2 fails to go off.Hub 5 Stats and Levels - potential issues?
I’m looking for some advice and, if it warrants, an engineer visit, as my Hub 5 stats suggest an ongoing downstream DOCSIS 3.1 issue. Background I moved into this property about a year ago and brought my Virgin Media service with me from my previous house. During renovation work, my builder offered to run some NX100 coax that I had previously used to extend Sky Q cabling. This was run under the floor and terminated with compression connectors, so I could locate my Hub 5 in an under-stairs cupboard. At the time, I didn’t think much of it. My setup Hub 5 in modem mode OPNsense router with VLAN separation 24 port managed switch Ceiling mounted AP upstairs Over time, I’ve had repeated issues with Sky Stream boxes, including slow channel loading and general instability, which led to multiple replacement boxes. That made me start looking more closely at the Virgin Media connection rather than the Sky hardware. After checking the web and forums, I realised that extending the internal coax like this isn’t officially supported, as Virgin use specific cable and connectors to maintain signal quality and could be the reason for my sky issues. Current cabling layout The Virgin feed into the house is split externally. One leg goes into the living room (this is the run that was extended internally using the NX100 cable). Another leg runs around the front, side, and back of the house, then splits again to feed the two rear bedrooms. To rule out the internal extension, I’ve now moved the Hub 5 upstairs and connected it directly to the original outlet there. I’m using Cat6a throughout the house, so router location isn’t an issue. Since doing this, the connection does feel more stable. This might be placebo, but I’m seeing fewer post RS errors than when the hub was downstairs. That said, the downstream DOCSIS 3.1 channel still appears to be struggling, and upstream power levels are on the high side. Hub details Hub 5 Uptime: ~4.5 days Issue observed The DOCSIS 3.1 downstream OFDM channel is showing extremely high uncorrectable error counts over a relatively short uptime. DOCSIS 3.0 channels look broadly healthy by comparison. Correct me if I'm wrong but from what I understand, this OFDM channel carries most of the traffic on a 500 Mb service, so this would explain intermittent performance issues even when speed tests sometimes look acceptable. I’ve now removed the non-standard internal coax run from the equation, but the error rate suggests there may still be a signal or noise issue either on the external cabling, splitter configuration, or at the cabinet. I’ve pasted my full downstream and upstream stats below. Modem stats 3.0 Downstream channels Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID 1 515000000 -5.4 38 QAM 256 48 2 139000000 0.6 39 QAM 256 1 3 163000000 0.8 38 QAM 256 4 4 171000000 -2.2 39 QAM 256 5 5 195000000 -3.2 39 QAM 256 8 6 203000000 -2.2 39 QAM 256 9 7 227000000 -2.9 39 QAM 256 12 8 235000000 -3.5 39 QAM 256 13 9 259000000 -3.9 39 QAM 256 16 10 267000000 -3.8 39 QAM 256 17 11 275000000 -3.1 39 QAM 256 18 12 283000000 -3.0 39 QAM 256 19 13 307000000 -3.2 39 QAM 256 22 14 315000000 -3.7 39 QAM 256 23 15 339000000 -4.2 39 QAM 256 26 16 347000000 -3.4 39 QAM 256 27 17 371000000 -3.6 39 QAM 256 30 18 379000000 -4.7 39 QAM 256 31 19 403000000 -5.3 38 QAM 256 34 20 411000000 -5.3 38 QAM 256 35 21 419000000 -4.7 38 QAM 256 36 22 427000000 -5.6 38 QAM 256 37 23 435000000 -5.6 38 QAM 256 38 24 443000000 -4.7 38 QAM 256 39 25 451000000 -5.7 38 QAM 256 40 26 459000000 -5.8 38 QAM 256 41 27 467000000 -5.2 38 QAM 256 42 28 475000000 -5.8 38 QAM 256 43 29 483000000 -5.6 38 QAM 256 44 30 491000000 -5.3 38 QAM 256 45 31 499000000 -5.9 38 QAM 256 46 32 507000000 -6.0 38 QAM 256 47 Channel Locked RxMER Pre RS Errors Post RS Errors 1 Locked 38 152336 216 2 Locked 39 1984722 246752 3 Locked 38 1503549 36867 4 Locked 39 2511397 309765 5 Locked 39 29896 3641 6 Locked 39 13719 1521 7 Locked 39 11052 1702 8 Locked 39 11813 914 9 Locked 39 7555 1156 10 Locked 39 7360 1034 11 Locked 39 9674 862 12 Locked 39 15196 1574 13 Locked 39 21596 2291 14 Locked 39 7633 848 15 Locked 39 2701 219 16 Locked 39 2544 350 17 Locked 39 4043 693 18 Locked 39 5688 240 19 Locked 38 22827 429 20 Locked 38 28284 544 21 Locked 38 34259 279 22 Locked 38 33851 217 23 Locked 38 33658 157 24 Locked 38 40376 430 25 Locked 38 47853 417 26 Locked 38 59408 344 27 Locked 38 72374 159 28 Locked 38 76705 249 29 Locked 38 89224 356 30 Locked 38 92496 342 31 Locked 38 100102 57 32 Locked 38 129376 111 3.1 Downstream channels Channel Width (MHz) FFT Active Subcarriers Modulation First Subcarrier (Hz) 159 94 4K 1840 QAM 4096 1108 Channel Locked RxMER PLC Power (dBmV) Corrected Errors Uncorrectable Errors 159 Locked 0 -11.9 72588512 1870611403 3.0 Upstream channels Channel Frequency (Hz) Power (dBmV) Symbol Rate Modulation Channel ID 0 49600000 51.3 5120 QAM 64 9 1 43100000 50.0 5120 QAM 64 10 2 36600000 52.0 5120 QAM 64 11 3 30100000 51.0 5120 QAM 64 12 4 23600000 50.3 5120 QAM 64 13 3.1 Upstream channels Channel Width (MHz) Power (dBmV) FFT Modulation 14 10 44.7 2K QAM 256 I’d appreciate someone from Virgin Media taking a look and, if needed, arranging an engineer visit to properly check signal levels, splitters, and the DOCSIS 3.1 downstream path.
Is this right?
Image Removed I have M500 package but am almost unable to use the internet at times...is this as bad as it appears to be or am I just not understanding something here? All I get from the app on my phone is that if it's the same in 24 hours virgin will look into this, but its been like this since the weekend at least.Broadband Outage - Partial Services (DS Only)
My broadband has been dropping out since Thursday. Virgin flagged the issue that same day and the service status on my account was updated, but the fix date keeps shifting. It seems it was area wide. It was meant to be sorted Friday morning and has now moved to Monday 24 November. My Hub 5 is in modem mode, and I’ve rebooted it, powered it off, and tried every usual step. Nothing changes. The connection still cuts out without warning. Speed is around 180-230mbps when I should be getting 500mbps. There are loads of pre and post RS errors on the downstream channels. On the home page of the modem the internet status says Partial Service (DS Only) in red. I work from home, so this has caused a real mess. Sky Stream keeps freezing, and things got so unreliable that I’ve ended up staying at my in-laws over the weekend just to get work done. They’re on Virgin too, and their speed is completely fine, which makes the whole situation even more confusing. Can someone explain what’s going on with this fault, why the fix date keeps slipping, and whether anything can be done in the meantime to keep the line steady?Not getting no were near the amount of MBPS i am meant to get
So recently noticed when i have been downloading games etc on my PC i have been getting roughly 8MBPS, i am paying for M250 Which says i should receive around that, but im getting no were near that.. Im running wired not wireless so should have quicker speedsslow upload speeds
In any country wanting to support digital industries, the upload speed would be the same as download. 8 years ago, Singapore had services that provided 10Gbps up- and download speeds. But Virgin is still providing a deliberately throttled upload speed. It is taking days to upload a 1TB set of files. As soon as the providers that provide a fast upload speed appear in my area, I shall be moving. Even if Virgin manages to do the same thing, I shall run away from a firm that has been deliberately making my life difficult for years.Virgin what have you done - Hub 5X
My Internet never best but could handle Teams and Roblox and didnt Buffer and i could download Last Wednesday Outage Last Thursday Firmware Update Since been awful Virgin say is a problem and then say all resolved , spent hours on chats , emailed CEO , log a complaint they close it :(
