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WickedestSound's avatar
WickedestSound
On our wavelength
21 days ago

Gaming lag on Hub 4 with 250Mb service

Good evening,

I've been seeing occasional packet loss on my connection and friends say I am lagging in games. I'm on a 250Mb service with a Hub 4. The speed is usually OK but can drop right down at times to below 10Mb upstream (normally it's 25Mb upstream). I'm connected from the PC to Hub with an Ethernet cable. I looked at the Hub stats which I've posted below.

3.0 Downstream channels

ChannelFrequency (Hz)Power (dBmV)SNR (dB)ModulationChannel ID
31547500005.59999838.983261QAM2563
11387500006.90000238.983261QAM2561
21467500006.30000340.366287QAM2562
41627500005.00000038.983261QAM2564
51707500004.59999838.983261QAM2565
61787500004.09999838.983261QAM2566
71867500003.79999940.946209QAM2567
81947500003.50000040.366287QAM2568
92027500002.90000240.366287QAM2569
102107500002.50000040.946209QAM25610
112187500001.79999938.983261QAM25611
122267500001.29999938.983261QAM25612
132347500001.00000038.983261QAM25613
142427500000.79999940.366287QAM25614
152507500000.79999940.946209QAM25615
162587500000.79999940.366287QAM25616
172667500000.40000240.366287QAM25617
19282750000-0.29999940.366287QAM25619
20290750000-0.59999840.366287QAM25620
21298750000-0.70000140.366287QAM25621
22306750000-0.70000140.366287QAM25622
23314750000-0.70000140.366287QAM25623
24322750000-1.09999838.605377QAM25624
25330750000-1.20000140.366287QAM25625
26338750000-1.50000038.983261QAM25626
27346750000-2.20000138.983261QAM25627
28354750000-2.90000238.983261QAM25628
29362750000-2.90000238.983261QAM25629
30370750000-3.00000038.605377QAM25630
31378750000-3.50000038.605377QAM25631
32386750000-3.59999838.983261QAM25632

3.1 Downstream channels

ChannelChannel Width (MHz)FFT TypeNumber of Active SubcarriersModulation (Active Profile)First Active Subcarrier (Hz)
33964K1840QAM256759

3.1 Downstream channels

Channel IDLock StatusRxMER Data (dB)PLC Power (dBmV)Correcteds (Active Profile)Uncorrectables (Active Profile)
33Locked28-20.21565054768115

3.0 Upstream channels

ChannelFrequency (Hz)Power (dBmV)Symbol Rate (ksps)ModulationChannel ID
13010000037.0205995120 KSym/sec64QAM4
24310000037.7705995120 KSym/sec64QAM2
33660000037.5205995120 KSym/sec64QAM3
42360000037.0205995120 KSym/sec16QAM5
54960000038.2705995120 KSym/sec16QAM1

3.1 Upstream channels

ChannelChannel Width (MHz)Power (dBmV)FFT TypeModulation
610.442.12KQAM128

3.1 Upstream channels

ChannelChannel TypeNumber of Active SubcarriersFirst Active Subcarrier (Hz)T3 TimeoutsT4 Timeouts
6OFDMA20853.450

Does anyone think I need to arrange an engineer for these stats please? Only things I can see is roughly a 10dB variance as the power trails off on the downstream channels and the upstream can't maintain 64QAM on all channels.

From the main cable in from the road, there is one splitter with two outlets. One is for this Hub 4 and the other for a V6 TV box in another room. That's it. I walked around the house and the cables look in good condition. All connectors are snug on the screw terminals. TV channels seem OK.

I'd be very grateful for any advice please. Thank you for reading.

3 Replies

  • You need an engineer visit to correct:

    • -20.2 dBmV on DOCSIS 3.1 upstream channel (Should be -6 to +10).
    • QAM values of 16QAM on two of the DOCSIS 3.0 upstream channels.
    • DOCSIS 3.0 power values across your downstream channels are all over the place.

     

    Looks like a combination of noise and bad connections somewhere.

    Assuming nothing reported:

    https://www.virginmedia.com/help/check/status

     

  • jpeg1's avatar
    jpeg1
    Alessandro Volta

    You were quite correct to notice the 10dB slope down to the higher frequency channels, for which the most likely cause is a poor coax connection. But since you have checked the internal connections the fault may be outside. 

    In any case you will need a technician to sort this out. 

  • WickedestSound's avatar
    WickedestSound
    On our wavelength

    Thank you very much carl_pearce and jpeg1 for your replies.

    I've been on the phone with Virgin this evening for 56 minutes now and we've rebooted the Hub and done speed tests. They won't do anything as the speed is OK at the moment. I mentioned the power values but they won't entertain it. They've asked me to try another Ethernet cable from the Hub to the computer and they are calling back tomorrow. We'll see what happens.