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  Reply # 1593210 15-Jul-2016 15:15
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stevenz:

 

63kbps on VDSL!? Wow, is the exchange on your front doorstep?

 

 

 

63,000 even...





________

 

Antonios K

 

 

 

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'That VDSL Cat'
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  Reply # 1593241 15-Jul-2016 17:02
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 Looks like your attenuation is moving a fair bit there.

 

 

 

Good to see chorus have picked up on the fault - As i pointed out earlier, the snr riding so high was a pretty good indicator of this.

 

 

 

Let it go, see how things go.

 

DLM simply operates WAY faster in the first 10 days, i forget the exact differences (ild have to pull up the chorus white paper to recall the exact configurations on their network). Doesnt mean it will definately make a change at given times, just that if it feels a change is worthwhile to make, it will do it.

 

 

 

 

 

To those surprised at the speed, looks like just a really clean line, low noise likely decent cabling too. As more jump on board, it would likely dip down in speed.

 

17a i would say is highly unlikely on that line.





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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.




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  Reply # 1593244 15-Jul-2016 17:09
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hio77:

 

 Looks like your attenuation is moving a fair bit there.

 

 

 

Good to see chorus have picked up on the fault - As i pointed out earlier, the snr riding so high was a pretty good indicator of this.

 

 

 

Let it go, see how things go.

 

DLM simply operates WAY faster in the first 10 days, i forget the exact differences (ild have to pull up the chorus white paper to recall the exact configurations on their network). Doesnt mean it will definately make a change at given times, just that if it feels a change is worthwhile to make, it will do it.

 

 

 

 

 

To those surprised at the speed, looks like just a really clean line, low noise likely decent cabling too. As more jump on board, it would likely dip down in speed.

 

17a i would say is highly unlikely on that line.

 

 

What is confusing me though is why it stayed at a reasonably poor speed for over 48 hours of continuous connectivity. It only improved after Chorus manually stepped in.

 

If my line is capable of higher speeds, shouldn't it have been trying this over the last few nights? Instead the modem stayed connected at the low sync rate, with no change in profile being tried or applied. I thought profile changes could happen every 24 hours over the first 10 days of a new VDSL connection.


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  Reply # 1593248 15-Jul-2016 17:29
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dclegg:

 

What is confusing me though is why it stayed at a reasonably poor speed for over 48 hours of continuous connectivity. It only improved after Chorus manually stepped in.

 

If my line is capable of higher speeds, shouldn't it have been trying this over the last few nights? Instead the modem stayed connected at the low sync rate, with no change in profile being tried or applied. I thought profile changes could happen every 24 hours over the first 10 days of a new VDSL connection.

 

 

In basic terms, the SNR margin is a target. When the modem connects and the line syncs, it will negotiate a speed that will allow (in your case) a 9dB margin between the actual signal and the background noise. This may vary a little (+/- 0.2 dB ish) but should stay fairly constant. That fact that yours had climbed into the 30s is a massive jump. This means that from the time the line originally synced, the background noise has dropped hugely. This is almost always a physical line issue like a corroded connector or similar. You should never see a 30dB SNR on a working line.

 

This is nothing to do with DLM, which in laymans terms is more like tweaking the initial sync speed that was negotiated when the modem was powered up.


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  Reply # 1593250 15-Jul-2016 17:29
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dclegg:

 

 

 

What is confusing me though is why it stayed at a reasonably poor speed for over 48 hours of continuous connectivity. It only improved after Chorus manually stepped in.

 

If my line is capable of higher speeds, shouldn't it have been trying this over the last few nights? Instead the modem stayed connected at the low sync rate, with no change in profile being tried or applied. I thought profile changes could happen every 24 hours over the first 10 days of a new VDSL connection.

 

 

Some sort of port failure ild suspect..

 

 

 

It is indeed odd, the world of copper though.. who knows when thats going to have a fit!





#include <std_disclaimer>

 

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


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  Reply # 1593280 15-Jul-2016 18:11
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DLM doesnt make changes every day. over the 10 days on my line it made 3 changes




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  Reply # 1599351 27-Jul-2016 08:30
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Status update: We had excellent VDSL performance for approximately a week (55Mbps/10Mbps), after Chorus did something remotely to fix our previous poor sync stats. I did reach out to ask what they did exactly, but didn't get a firm reply as to what they did.

Then on Monday night (approximately 9PM), our connection dropped. It resumed, synching at about 50Mbps down. That lasted about 10 minutes and it went down again. When it reconnected, the modem was synching at 6Mbps/1.6Mbps. 

 

Yesterday morning I raised a support case with Spark, after rebooting the modem first (which made no difference). At approximately 12:15PM, my connection went down again. Once re-established, the modem was synching at 58Mbps/10Mbps. I suspect this was a result of Chorus doing something somewhere (although they haven't been onsite yet).

 

This lasted until approximately 8:30PM last night, when I lost connection again. Ever since then, my sync stats have been this:-

 

 

 

Is it possible that this is DLM dicking around, or an indication of a different problem? I find it quite unusual that my problems are often solved by Chorus doing something externally. Would this indicate that they may be resetting my port, which is fixing this? And what does a port reset actually mean in practical terms? Is it the telecommunications equivalent of "turning it off and back on again"?

And is a "port" a physical entity that may have a fault? We've had ongoing ADSL issues stretching back to last year, which were always resolved by Chorus coming out, even though they've never found a fault (apart from once reseating some wires in a nearby external junction box).

I was hoping that a move to VDSL may help here, and one Chorus tech told me that it should. He said we should be on a new port after the switch, so if it was a port fault this would probably address that. But I overheard the Chorus installer (a different tech) saying on the phone "Yes, same port", which has me wondering if we are on the same port as we had for VDSL (is that even possible?).

As I said earlier, I have escalated this with Spark, who have in turn escalated it with Chorus. But this is not my first turn on this roundabout, and I'm starting to get frustrated with the inability to pinpoint exactly where the problem may lie.

 

 

 

 


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  Reply # 1599517 27-Jul-2016 14:16
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At this point, i would say whatever chorus did should be done again, followed up with a long linetest ran so they can get more information to work on it.

 

 

 

Understanding chorus techs thoughts on faults is not always the best, as it is often what they identify the fault to be (not saying their view is wrong, just that it may take the correct tech to spot the fault your having )





#include <std_disclaimer>

 

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.




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  Reply # 1604082 4-Aug-2016 09:53
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SIGH! Here we go again...

To get to the bottom of these recurring issues, Spark called Chorus in again last week. When I asked for a status update on Saturday, Spark told me this..

 

I've found the open ticket, the tech assigned as not restored things to a VDSL class spec (which is above 15mbps) we've lodged things with Chorus to review and bring within spec you should be contacted shortly to confirm when the Chorus tech is revisiting.



After receiving this update, I rebooted the modem, and found I was then synching at 50Mbps/10Mbps. When I asked them what the problem was, I was told this.

 

Really interesting! Normally the modem will attempt a resync every 24 - 72 hours to ensure the best speeds are obtained, strange that they've dropped in the first place though :(

I have confirmed the picture is look much better our end too. Shall we monitor this for the next 24 hours and place the tech on hold?

 

When I replied that I had reservations about putting the tech on hold, due to the recurring nature of this problem, I got this reply

 

We're running an extended line test on your line just to monitor and see if we can find anything going on. We also noticed Chorus did some network testing on the 27th of July for your connection and found the issue, which now appears to be OK.

 

At this point we can see the connect rates are 58mbit down, 10mbit up. Hopefully it'll stay that way =)

 

We'll let you know if we find anything, and if you experience any issues feel free to let us know =) 

 



So Chorus both found nothing wrong, and found & resolved the problem...temporarily.

 

I got decent sync rates (50Mbps/10Mbps) from Saturday through to early this morning. At around 4AM this morning, the modem lost connectivity again, and is now only synching at 10Mbps/7Mbps.

 

 

As an aside... what is really frustrating is that I couldn't initially connect to the admin UI on my modem (Spark provided Huawei HG630b) to diagnose what was going on. It kept timing out when attempting to do so. I had to reboot the modem twice before I could get in. Is this a common problem with these modems?



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  Reply # 1604204 4-Aug-2016 12:09
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Jase2985:

 

wiggle some wires and see if anything changes :) just don't tell your isp you did that if the connection stops working

 

 

 

 

 

 

(whispers): Your ISP is ALWAYS watching you....... like now :)





The views expressed by me are not necessarily those of my employer Chorus NZ Ltd




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  Reply # 1604208 4-Aug-2016 12:11
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Wheelbarrow01: 

 

(whispers): Your ISP is ALWAYS watching you....... like now :)

 

 

Duly noted :-) 

 

Let me know if there is further diagnostic information I can provide.


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  Reply # 1604217 4-Aug-2016 12:23
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I wonder if it isn't the Modem?

 

 

 

You don't have another you could swap in (or know someone you can blag one off?)




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  Reply # 1604219 4-Aug-2016 12:25
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trig42:

 

I wonder if it isn't the Modem?

 

 

 

You don't have another you could swap in (or know someone you can blag one off?)

 

 

No I don't. Got a couple of spare ADSL modems, but only this VDSL one.

 

Another thought (but it seems unlikely, as the sync stats shouldn't be affected by this) is that I'm actually using the modem in bridged mode, with my ASUS router. If Spark & Chorus come up with nothing, I may try taking the router out of the equation and using the Huawei only (although the kids will scream blue murder, as that has far inferior wifi reach).


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  Reply # 1604599 4-Aug-2016 20:48
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why not run the router as just a simple access point instead of the setup you have now?




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  Reply # 1604611 4-Aug-2016 20:59
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trig42:

I wonder if it isn't the Modem?


 


You don't have another you could swap in (or know someone you can blag one off?)



Spark are sending me a replacement modem/router. Fingers crossed.

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