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Author Topic: How does CRC & RS count go up when not in use?  (Read 5219 times)

snadge

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How does CRC & RS count go up when not in use?
« on: May 19, 2012, 11:57:30 AM »

ive noticed overnight my CRC / RS counts go up...eevn when router is not in use, is this normal when you have a 3.5db SNRM..? looking at DMT Tool stats its reporting about 15 CRC's for each 15 minute segment of last hour (60  per hour) and ive just turned the computer on?

cheers
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 64,000k on VDSL2 <-> INP: ON <-> FTTP available :) 900Mbps +5G EE Mobile

asbokid

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Re: How does CRC & RS count go up when not in use?
« Reply #1 on: May 19, 2012, 07:36:23 PM »

ive noticed overnight my CRC / RS counts go up...eevn when router is not in use, is this normal when you have a 3.5db SNRM..? looking at DMT Tool stats its reporting about 15 CRC's for each 15 minute segment of last hour (60  per hour) and ive just turned the computer on?

cheers

With ATM (ADSLx), there are 'idle cells' transmitted all the time that the connection is up, whether or not there is a payload in the traffic at the network layer.

Each ATM cell has a 48 byte payload + 5 header bytes.  The ATM cell counters are still running during idle. Those idle cells contain a predictable sequence of dummy data. That data (payload and header) is still error-checked/error-corrected.

So both the HEC header checksum error counter and the Reed Solomon payload error counters, correctable and not, are incremented where necessary.

cheers, a
« Last Edit: May 19, 2012, 07:39:31 PM by asbokid »
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snadge

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Re: How does CRC & RS count go up when not in use?
« Reply #2 on: May 19, 2012, 09:35:00 PM »

thanks for that explanation asbokid :)

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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 64,000k on VDSL2 <-> INP: ON <-> FTTP available :) 900Mbps +5G EE Mobile

snadge

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Re: How does CRC & RS count go up when not in use?
« Reply #3 on: May 19, 2012, 09:37:28 PM »

im so frustrated and stressed with sky at the moment its unreal.. I should file for damages... my line is all to cock at the moment and they are washing their hands of it for another 3 months - noise on line tonight has increased bringing my sync rate down into the 9Mb zone..and upstream Line Attenuation is still flucatuatin 7-16db

ive actually got a bad head and feel like lunging out because of the way i have been treated and theres NOTHING i can do about it
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 64,000k on VDSL2 <-> INP: ON <-> FTTP available :) 900Mbps +5G EE Mobile

asbokid

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Re: How does CRC & RS count go up when not in use?
« Reply #4 on: May 19, 2012, 11:07:50 PM »

im so frustrated and stressed with sky at the moment its unreal.. I should file for damages... my line is all to cock at the moment and they are washing their hands of it for another 3 months - noise on line tonight has increased bringing my sync rate down into the 9Mb zone..and upstream Line Attenuation is still flucatuatin 7-16db

ive actually got a bad head and feel like lunging out because of the way i have been treated and theres NOTHING i can do about it

Wish I had some useful advice.  Things can often be difficult when dealing with such large companies. Do you know how Sky Internet is related to BSkyB and News International?  Would a Regime Change at BSkyB see any changes at Sky Internet, or is it not structured to benefit from that?

cheers, a

« Last Edit: May 20, 2012, 12:35:20 AM by asbokid »
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snadge

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Re: How does CRC & RS count go up when not in use?
« Reply #5 on: May 19, 2012, 11:19:25 PM »

I dont think it would benefit...

I just sent a message to one of the forum staff who asked for a brief description of whats been happening and my "brief description" actually turned out to be very long (several paragraphs) ..thats how bad it is... and I got a reply that I could tell the rep hadnt read it all because if he had he wouldnt have said what he did..

speed now down to 9.5Mb cos of the noise.. thats a 2Mb drop..


« Last Edit: May 20, 2012, 01:17:05 AM by snadge »
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 64,000k on VDSL2 <-> INP: ON <-> FTTP available :) 900Mbps +5G EE Mobile

Bald_Eagle1

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Re: How does CRC & RS count go up when not in use?
« Reply #6 on: May 19, 2012, 11:41:56 PM »


speed now down to 9.5Mb cos of the noise.. thats a 2Mb drop..



Is this all done via SRA, or does the router actually fully re-sync regularly?

If it is SRA, I would like to see what it looks like on the ongoing graphs.
Are you having any success with logging those stats?


EDIT:

It seems like your attenuation isn't static either.

It was Attn(dB):       26.5            15.3 on 16th
& now it it is            27.5            13.5
« Last Edit: May 19, 2012, 11:58:27 PM by Bald_Eagle1 »
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snadge

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Re: How does CRC & RS count go up when not in use?
« Reply #7 on: May 20, 2012, 12:12:04 AM »

i havent been using the ongoing one today. its SRA thats doing it. I will try running it tomoz but i know the current stats scripts fail if DMT Tool is open and i have it open a lot for live stats

its just started happening the past 5 or 6 nights and seems like its getting worse

my 9Mb stats and crap SNR:




my QLN stats: see how mine has more background noise than customer below but the two AM radio spikes remain, there is another customer who is exactly same, mine is take now at peak of evening noise increase

note the scale..patterns are the same but the signals are STRONGER on mine peaking at -75db where as one below peaks at about -85db , compare at around -120db mark, as you can see I have much more noise on the line - these people live twice as far from exchange almost!! and thats whats eating into my line aswell as those AM radio station spikes





customer no.3 QLN stats: (they were getting HALF the speed too)

« Last Edit: May 20, 2012, 12:26:28 AM by snadge »
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 64,000k on VDSL2 <-> INP: ON <-> FTTP available :) 900Mbps +5G EE Mobile

Bald_Eagle1

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Re: How does CRC & RS count go up when not in use?
« Reply #8 on: May 20, 2012, 11:11:56 AM »

i havent been using the ongoing one today. its SRA thats doing it. I will try running it tomoz but i know the current stats scripts fail if DMT Tool is open and i have it open a lot for live stats

I don't know if my Telnet enabling batch file that uses wget, posted in the other graphing thread will get round this limitation?
Might just be worth a try?

http://forum.kitz.co.uk/index.php/topic,11163.msg217281.html#msg217281

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