what causes this?
 

these thin red lines are outages and it cuts my internet off for a few minutes.

I was watching IPlayer and then I had the yellow X pop on my internet connection icon at the bottom right hand corner of my screen.

I quickly checked all the lights on the hub and all went off expect for the traffic light which was flashing green and then everything came back to normal.

looking at my graph this has been the 4th issues today, there was some issues yesterday but I have went weeks without similar issues.

is there a fault on the line or they working on something?!

Can't get my head around it.

http://www.thinkbroadband.com/ping/s...06-11-2012.png

Re: what causes this?
 

Sounds like your modem lost sync and reconnected again. You should check your signal levels.

Re: what causes this?
 

Lock Status Channel ID Frequency Modulation Rx Power SNR Pre RS Errors Post RS Errors
Locked 50 299000000 Hz QAM256 0.5 dBmV 37.7 dB 3049 526
Locked 49 291000000 Hz QAM256 0.2 dBmV 37.5 dB 15448 242
Locked 53 307000000 Hz QAM256 -0.8 dBmV 36.9 dB 12676 589
Locked 54 315000000 Hz QAM256 0.1 dBmV 37.3 dB 24188 651
Locked 55 323000000 Hz QAM256 0.3 dBmV 37.8 dB 1365 585
Unlocked Unknown 0 Hz Unknown 0.0 dBmV 0.0 dB Unknown Unknown
Unlocked Unknown 0 Hz Unknown 0.0 dBmV 0.0 dB Unknown Unknown
Unlocked Unknown 0 Hz Unknown 0.0 dBmV 0.0 dB Unknown Unknown

---------- Post added at 21:02 ---------- Previous post was at 21:01 ----------

Upstream Channels Lock Status Channel ID Frequency Modulation Tx Power Mode Channel Bandwidth Symbol Rate
Locked 4 35800000 Hz ATDMA 42.5 dBmV 16QAM 6400000 20480 Kbits/sec
Unlocked 0 0 Hz Unknown 0.0 dBmV Unknown Unknown 0 Kbits/sec
Unlocked 0 0 Hz Unknown 0.0 dBmV Unknown Unknown 0 Kbits/sec
Unlocked 0 0 Hz Unknown 0.0 dBmV Unknown Unknown 0 Kbits/sec

---------- Post added at 21:03 ---------- Previous post was at 21:02 ----------

but its a random thing.

It can go weeks without this actually happening.

---------- Post added at 21:12 ---------- Previous post was at 21:03 ----------

this is from the 31st October, probably the worst I've had.

http://www.thinkbroadband.com/ping/s...31-10-2012.png

---------- Post added at 21:14 ---------- Previous post was at 21:12 ----------

23rd October

http://www.thinkbroadband.com/ping/s...23-10-2012.png

---------- Post added at 21:18 ---------- Previous post was at 21:14 ----------

anyone advise me how to sort this issue?

Re: what causes this?
 

the power levels looks fine to me
the only you can do at your end is to check at splitters and behind modem if the coax cable connections are firmly tide
also check at your modem router status >> network log ....if you have any T3 & T4 time outs

Re: what causes this?
 

06/11/2012 19:45:01 2436694078 TOD established
27/10/2012 18:58:46 82000500 Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=4c:60:de:1c:c1:60;CMTS-MAC=00:21:d8:d1:8c:43;CM-QOS=1.1;CM-VER=3.0;
21/10/2012 17:21:41 2436694077 TOD server unavailable
21/10/2012 17:21:41 2436694080 TOD resynchronisation failure
Time Not Established Time Not Established 68000300 DHCP WARNING - Non-critical field invalid in response ;CM-MAC=4c:60:de:1c:c1:60;CMTS-MAC=00:21:d8:d1:8c:43;CM-QOS=1.0;CM-VER=3.0;
Time Not Established Time Not Established 82000200 No Ranging Response received - T3 time-out;CM-MAC=4c:60:de:1c:c1:60;CMTS-MAC=00:21:d8:d1:8c:43;CM-QOS=1.0;CM-VER=3.0;

Re: what causes this?
 

2 more today.

https://www.cableforum.co.uk/images/...2013/01/14.png

Re: what causes this?
 

Does this happen in modem mode? It might be difficult for you to chack if you don't have a router or need to connect more than one device; but the SH is not a stable device in router mode.

That said, is your upstream power stable at 42.5 or does it move upwards toward 55 dBmv? Because that owuld explain what you are seeing. Upstream impairment.

Re: what causes this?
 

I really don't know mate you are talking above my knowledge on IT matters.

I dont have it in modem mode no.

had another wee short outage again at 2am this morning

Re: what causes this?
 

I'm saying that you should confirm your upstream power level is stable.

Also I'm suggesting you try modem mode (if upstream power is stable) to see if it's the famous SH instability in router mode that you are suffering.

Re: what causes this?
 

Basically what he's saying is to keep checking the same page you got the power levels from you posted above and see if there are any big fluctuations.

Re: what causes this?
 

cheers but I don't really know what these power levels are meant to be. I'm at work at the minute so can't check the levels just now.

I'm not really all that confident about mucking around with Hub and changing settings.

As I said this appears to be something new that has cropped up. Had another 2 this morning/early afternoon

as poster above did say my power levels looked fine.

http://www.thinkbroadband.com/ping/s...08-11-2012.png

Re: what causes this?
 

You aren't the only one suffering these spikes. I started getting these recently and they are really annoying.

I'm in the lincoln area. Where are you?

http://www.thinkbroadband.com/ping/m...3-11-2012.html

Re: what causes this?
 

Damn, graph didn't show.

http://www.thinkbroadband.com/ping/s...03-11-2012.png

Re: what causes this?
 

Certainly on legacy SACM I used to see these packet loss spikes correlate with UCD's in event log. Have a check to see if your upstream modulation is changing or your u/s channel frequency? Post your Network logs and "tick counters".

Re: what causes this?
 

Yes, what The Horse says = upstream noise

Re: what causes this?
 

There isn't anything in my network log since I cleared it over a month ago, so no log to post.

Which page are 'tick counters' on? I can't see what you are asking for.

Re: what causes this?
 

http://192.168.100.1/VmRouterStatus_upstream.asp
….or...
http://192.168.100.1/VmRgNetworkStatus.asp


but they do get reset every so often after (hopefully) being transmitted to CMTS. However if there's nothing in your Network log then they're probably all zero anyway…

Re: what causes this?
 

Here you go. Downstream is included just in case it helps.

US-1 US-2 US-3 US-4
Channel Type 2.0 2.0 N/A N/A
Channel ID 5 4 N/A N/A
Frequency (Hz) 35800000 Hz 45800000 Hz N/A N/A
Ranging Status Success Success N/A N/A
Modulation QAM16 QAM16 N/A N/A
Symbol Rate (Sym/sec) 5120000 5120000 N/A N/A
Mini-Slot Size 128 128 N/A N/A
Power Level (dBmV) 53.0 dBmV 54.3 dBmV N/A N/A
T1 Timeouts 0 0 N/A N/A
T2 Timeouts 0 0 N/A N/A
T3 Timeouts 0 0 N/A N/A
T4 Timeouts 1 1 N/A N/A

DS-1 DS-2 DS-3 DS-4 DS-5 DS-6 DS-7 DS-8
Frequency (Hz) 323000000 Hz 283000000 Hz 291000000 Hz 299000000 Hz 307000000 Hz 315000000 Hz N/A N/A
Lock Status(QAM Lock/FEC Sync/MPEG Lock) Locked Locked Locked Locked Locked Locked N/A N/A
Channel ID 80 75 76 77 78 79 N/A N/A
Modulation QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 N/A N/A
Symbol Rate (Msym/sec) 6.952000 6.952000 6.952000 6.952000 6.952000 6.952000 N/A N/A
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 N/A N/A
Power Level (dBmV) 5.0 dBmV 3.8 dBmV 3.2 dBmV 3.7 dBmV 3.7 dBmV 5.0 dBmV N/A N/A
RxMER (dB) 41.4 dB 42.0 dB 41.8 dB 41.9 dB 41.9 dB 41.9 dB N/A N/A
.

Re: what causes this?
 

Upstream is too high seeing as you have 2 bonded

Re: what causes this?
 

Only if it isn't stable at those values.

Re: what causes this?
 

I thought >50dBmV was an issue with 2 or more upstreams?

Re: what causes this?
 

It's not ideal - but if it's stable and there is no upstream problem, then that's what it takes to push the data. If the upstream power is fluctuating (like stepping up through the values reaching 55 dBmv), then there's a problem.

Re: what causes this?
 

Fairy 'nuff - but im sure VM work to 50 now instead of 55 IIRC

Re: what causes this?
 

It depends on what you mean "work to". In the same way as the ideal downstream is 0 dBmv, upstream is 40 dBmv (for reasons I've explained in my sticky on the VM forum).

Of course, plant/infrastructure can't be guaranteed across the board to behave ideally, hence the range of acceptable upstream values. The SH maxes out at 58 dBmv and so anything below that which is stable and produces acceptable upstream performance can be tolerated, though far from ideal because there is no headroom after 55 dBmv.

As a rule, infrastructure is behaving well if upstream power is as much above 40 dBmv as downstream is below 0 dBmv and vice versa. You see this in the various stats posted by peops.

But you're right in the sense that the OP needs to keep an eye on the upstream in the way that I have suggested.

Re: what causes this?
 

By "work to" I meant in the same way as they used to arrange a tech visit if it was above 55, they now do for above 50 (i could be wrong there)

Re: what causes this?
 

I'm still getting the internet dropouts although not as badly.

I see that my channel IDs have swapped upstreams and the power levels are slightly higher.

US-1 US-2 US-3 US-4
Channel Type 2.0 2.0 N/A N/A
Channel ID 4 5 N/A N/A
Frequency (Hz) 45800000 Hz 35800000 Hz N/A N/A
Ranging Status Success Success N/A N/A
Modulation QAM16 QAM16 N/A N/A
Symbol Rate (Sym/sec) 5120000 5120000 N/A N/A
Mini-Slot Size 128 128 N/A N/A
Power Level (dBmV) 54.3 dBmV 54.0 dBmV N/A N/A
T1 Timeouts 0 0 N/A N/A
T2 Timeouts 0 0 N/A N/A
T3 Timeouts 0 0 N/A N/A
T4 Timeouts 1 1 N/A N/A