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treeoctopus
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Packet Loss / Ping spikes + Video Streaming Quality Issue

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 Smiley Sad

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? Smiley Happy

Cable Modem StatusItem Status Comments

Acquired Downstream Channel (Hz)474750000Locked
Ranged Upstream Channel (Hz)25800000Success
Provisioning StateOKOperational

 

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

Frequency (Hz)474750000482750000490750000498750000506750000514750000522750000530750000
Lock Status(QAM Lock/FEC Sync/MPEG Lock)LockedLockedLockedLockedLockedLockedLockedLocked
Channel ID910111213141516
Modulation256QAM256QAM256QAM256QAM256QAM256QAM256QAM256QAM
Symbol Rate (Msym/sec)6.9520006.9520006.9520006.9520006.9520006.9520006.9520006.952000
Interleave DepthI=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)35.9736.1736.1736.1736.8436.8436.8436.61
Pre RS Errors45661138853202631582112909128071282612307
Post RS Errors98479005747477198961882291197994

 

Upstream  US-1 US-2 US-3 US-4

Channel Type2.02.02.02.0
Channel ID8567
Frequency (Hz)25800000462000003940000032600000
Ranging StatusSuccessSuccessSuccessSuccess
Modulation64QAM64QAM64QAM64QAM
Symbol Rate (Sym/sec)5120000512000051200005120000
Mini-Slot Size2222
Power Level (dBmV)45.0046.2545.2544.75
T1 Timeouts0000
T2 Timeouts0000
T3 Timeouts0000
T4 Timeouts0000

 

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

Modulation Type16QAMQPSK16QAM64QAM64QAM16QAM
Differential EncodingOFFOFFOFFOFFOFFOFF
Preamble Length56640384104104104
Preamble Value Offset65200716716716
FEC Error Correction (T)05510165
FEC Codeword Information Bytes (K)1634348122386
Maximum Burst Size0003255255
Guard Time Size84848888
Last Codeword LengthFixedFixedFixedShortenedShortenedShortened
Scrambler On/OffONONONONONON

 

 

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Static
Fibre optic
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Message 2 of 6
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Re: Packet Loss / Ping spikes + Video Streaming Quality Issue

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. 

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treeoctopus
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Message 3 of 6
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Re: Packet Loss / Ping spikes + Video Streaming Quality Issue

thanks, will do 

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treeoctopus
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Re: Packet Loss / Ping spikes + Video Streaming Quality Issue

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
Locked1410750000 Hz256 QAM5.6 dBmV 35.2 dB957922
Locked2418750000 Hz256 QAM5.9 dBmV 35.6 dB987976
Locked3426750000 Hz256 QAM6.1 dBmV 36.0 dB920919
Locked4434750000 Hz256 QAM6.0 dBmV 36.0 dB312305
Locked5442750000 Hz256 QAM6.0 dBmV 35.1 dB936936
Locked6450750000 Hz256 QAM6.2 dBmV 37.1 dB971971
Locked7458750000 Hz256 QAM6.6 dBmV 37.4 dB961961
Locked8466750000 Hz256 QAM6.6 dBmV 35.8 dB947947

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
Locked825800000 HzATDMA38.3 dBmV64QAM6400000 Hz5120 Ksym/sec
Locked546200000 HzATDMA39.8 dBmV64QAM6400000 Hz5120 Ksym/sec
Locked732600000 HzATDMA38.3 dBmV64QAM6400000 Hz5120 Ksym/sec
Locked639400000 HzATDMA38.8 dBmV64QAM6400000 Hz

5120 Ksym/sec

 

 

Downstream  DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8
Frequency (Hz)410750000418750000426750000434750000442750000450750000458750000466750000
Lock Status(QAM Lock/FEC Sync/MPEG Lock)LockedLockedLockedLockedLockedLockedLockedLocked
Channel ID12345678
Modulation256QAM256QAM256QAM256QAM256QAM256QAM256QAM256QAM
Symbol Rate (Msym/sec)6.9520006.9520006.9520006.9520006.9520006.9520006.9520006.952000
Interleave DepthI=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)5.515.795.995.915.916.166.466.48
RxMER (dB)35.6035.9736.1736.1735.7837.0935.2537.09
Pre RS Errors3173319268919281035935989
Post RS Errors2993169248879281034934989

 

 

Upstream  US-1 US-2 US-3 US-4
Channel Type2.02.02.02.0
Channel ID8576
Frequency (Hz)25800000462000003260000039400000
Ranging StatusSuccessSuccessSuccessSuccess
Modulation64QAM64QAM64QAM64QAM
Symbol Rate (Sym/sec)5120000512000051200005120000
Mini-Slot Size2222
Power Level (dBmV)38.5039.7538.2538.75
T1 Timeouts0000
T2 Timeouts0000
T3 Timeouts1000
T4 Timeouts0000

 

Upstream Burst  Req(1) Init Maint(3) Per Maint(4) Adv Short(9) Adv Long(10) Adv UGS(11)
Modulation Type16QAMQPSK16QAM64QAM64QAM16QAM
Differential EncodingOFFOFFOFFOFFOFFOFF
Preamble Length56640384104104104
Preamble Value Offset65200716716716
FEC Error Correction (T)05510165
FEC Codeword Information Bytes (K)1634348122386
Maximum Burst Size0003255255
Guard Time Size84848888
Last Codeword LengthFixedFixedFixedShortenedShortenedShortened
Scrambler On/OffONONONONONON

 

 

 

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

Sat 02 Feb09:35 GMT185.143.221.3681141TCP- or UDP-based Port Scan
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treeoctopus
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Message 5 of 6
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Re: Packet Loss / Ping spikes + Video Streaming Quality Issue

Hi, any chance of someone from VM looking at this please?
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Forum Team
Forum Team
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Message 6 of 6
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Re: Packet Loss / Ping spikes + Video Streaming Quality Issue

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

Katie - Forum Team


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