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hedgehogspen
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Random line drops and packet loss

Hi,

 hopefully posting to the right board...

For a while now we've been having what look like line drops, the symptom of which is the PS4 popping up the message "LAN cable not connected". This is especially annoying if you're trying to watch Netflix, for example.

I've been running the quality monitor from Thinkbroadband.com for a while and see regular packet loss, (though not massive), and what i think are large latency spikes. Here's the latest graph from the monitor:

https://www.thinkbroadband.com/broadband/monitoring/quality/share/39b737b4a13b33fac45489b44e3cd79b1c...

Looking at the log on the hub I'm seeing the "No Ranging Response Received - T3 time-out" message several times a day, though strangely not yesterday or today.

When I did a search on that message I found a number of conversations around Rx Power, so had a quick look and here's what the router has to say about that:

Downstream Channels

     

Lock Status

Channel ID

Frequency

Modulation

Rx Power

RxMER

Pre RS Errors

Post RS Errors

Locked

12

499000000 Hz

256 Q4M

5 0 dBmV

37 9 dB

6587

287

LDC•e1

9

476313110 H:

2 Z—M

4 1 IBm.

371 18

13148

296

Locked

10

483000000 Hz

256 QALI

4.7 dSmV

37.4 dB

3857

297

Locked

11

491000000Hz

2560AL1

4.6dBmV

37.1dB

4220

292

Locked

13

507000000 Hz

256 Q.JA

4.9 dSmV

37.9 dB

5003

294

LocRed

14

515000000Hz

2S6QAJA

49dBmV

37.9dB

7181

279

L:ce’I

15

523033000 H:

256

48 IBm.

37618

8924

283

Locked

16

531000000 Hz

256 QALI

4.8 dBmV

37.6 dB

10546

299

 

Upstream Channels

Lock Status Channel ID Frequency Modulabon TX Power Mode Channel Bandwidth Symbol Rate
Locked 1 46200000 Hz ATDMA 34.3
dGrnV 640AM 6400000 Hz 5120 Ksym!sec
Locked 2 39400000 Hz ATDMA 34.3 dSmV 64QAM 6400000 Hz 5120 Ksyrnlsec
Locked 3 32600000Hz ATDMA 343 dBmV 640AM 6400000 Hz 5120 Ksymlsec
Locked 4 25800000 Hz ATDMA 34.3 d8mV 16QAM 6400000 Hz 5120 Ksym’sec

Sorry, no idea why the downstream has formatted fine and the Upstream not, the vagaries of OneNote!

Anyway, turning to the community in the hope you can spot something that I can take to the VM helpdesk...

Thanks in advance!
 

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Re: Random line drops and packet loss

Hello hedgehogspen, 

Thanks for joining us on the Community Smiley Very Happy

Sorry for your connection problems. I've just tested your network and I can't find any immediate faults. I can see 9 time-outs, but you've been online for 8 days without a reboot so it's hard to be sure when these occurred. Everything else such as your power and SNR levels, look normal. 

Has this improved at all since your last post?

Speak soon, 

Take care. 

Heather_J

Tech fan? Have you read our Digital life blog yet? Check it out


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hedgehogspen
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Re: Random line drops and packet loss

Heather_J,

Thanks for getting back to me, appreciated.

Yes, ironically since I posted we've not seen the 'LAN cable not connected' message whilst watching Netflix.

Still seeing large latency spikes and a little bit of packet loss on the monitor, but packet loss does seem to have decreased (after a spike on Wednesday evening).

Very good to know that the power and SNR levels look ok, the danger of reading forum posts I guess Smiley Happy

Checked the logs and only 4 'T3 timeouts' between the 10th and today, which IIRC is less than before...perhaps the check you did sprinkled some magic dust on the connection? Smiley LOL

You mention being online for 8 days...should I be rebooting more frequently than I am perhaps?

Thanks again.

 

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Re: Random line drops and packet loss

Hello hedgehogspen, 

Thanks for getting back to me.

Good to know my magic dust is still working Smiley Tongue

Don't worry about the 8 day thing, this is only relevant when we're trying to workout how frequently your Hub is timing out. We recommend weekly reboots to ensure everything runs smooth, so you're doing everything right. 

We're always here if you need us. 

Take care. 

Heather_J

Tech fan? Have you read our Digital life blog yet? Check it out


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