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51 posts

Master Geek
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Topic # 111639 9-Nov-2012 21:22 Send private message

Hey Geeks

 

I’m currently in the throes of a broadband investigation and could use some input from you geniuses.

I live out in the country, about 10 minutes’ drive from the nearest city and 4km from the nearest whisper cabinet. I receive ADSL internet from Slingshot and use a Draytek Vigor 2830vn Modem/Router.

My speeds have always been poor (obviously) but the first few times I changed internet plans with Slingshot my speeds did increase. For the last year or so now my speeds have been sitting under or around the 1.2Mbps area with a ping of 45ms to Auckland.

Everything was going swimmingly until just over a month and a half ago; suddenly I started experiencing slower speeds around peak times which progressively got slower until I was experiencing serious drop outs fairly regularly.

This meant browsing the Internet became near impossible (let alone gaming or using teamspeak/skype). I performed isolation tests (removing filters and plugging the phone line directly into the modem and connecting only 1 pc, switching phone jacks etc.) and no difference was made, I’d still get crazy ping fluctuations of up to 2000ms and speeds down to a few Kilobytes per second.

I called Slingshot and requested that Interleaving be turned on, this resulted in my non-peak speeds increasing to 2.2mbps Laughing and my ping to Auckland increasing to 65ms Undecided (which is to be expected).

While I have now seen a massive improvement in speed during these peak hours of 6pm to 10pm weekdays and all day Saturday, the speed still drops to 0.8mpbs at times and quality of connection (which is the key here) is still poor, resulting in bad VoIP quality etc.

However, my upload speed has remained a rock solid 0.45mbps throughout the whole affair.

I ran a test using the diagnostic at www.myconnectionserver.com and received the following results:

 

A basic analysis:
http://i442.photobucket.com/albums/qq145/Incindre/myconnectionserver1.jpg

A Graphed analysis:

http://mcsiad.visualware.com/myspeed/db/report?id=974584

 
(Hyperlinks don't seem to be working sorry, just copy paste!)

Note that in the graphed analysis, the upload speed is fairly stable and the wait between TCP packets is acceptably low. But it’s a completely different story for download. As you can see the wait times between packets at times are gigantic and the stability of the speed is very eratic.

Do any of you Net Boffins know whether these download problems are being caused by hardware (exchange/cabinet etc.) or if there is something more sinister at work?

Any insight into this would be awesome (and do check out that site if you are a novice, it explains a whole heap of things and has some very useful tools).

Cheers,
Incindre

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224 posts

Master Geek
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  Reply # 714933 9-Nov-2012 21:28 Send private message

Whats is ur line stats from modem

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Uber Geek
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  Reply # 714951 9-Nov-2012 21:47 Send private message

Approx where are you?






51 posts

Master Geek
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  Reply # 715035 10-Nov-2012 08:41 Send private message

http://i442.photobucket.com/albums/qq145/Incindre/ModemStats.jpg

Is that what you're after?

The residence is about halfway between Pirongia township and Hamilton City on the West side, I can get you a map that shows the cabinets in the area on it if you are interested.

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  Reply # 715038 10-Nov-2012 08:51 Send private message

With 59dB attenuation you're not going to get anything better without finding the cause of the issue. Attenuation shouldn't be this high if you are exactly 4km, but if you have eliminated your internal wiring I suspect the cable distance is infact greater, in which case there isn't really a lot that can reastically be done.

BDFL
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  Reply # 715054 10-Nov-2012 10:13 Send private message

I read the post again and I don't see the OP mentioning his internal wiring was checked/confirmed in good condition.




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  Reply # 715063 10-Nov-2012 10:43 Send private message

freitasm: I read the post again and I don't see the OP mentioning his internal wiring was checked/confirmed in good condition.


Ahh I read the bit about unplugging the phones and read that as performing a basic isolation test, when that doesn't seem to be the case.

First step is to perform a basic isolation test by bypassing all phones and jackpoints and connecting the modem directly to the incoming wiring. If you don't have the technical abiltiy to do this you'll need to get somebody else proficient in data or phone cabling to help you.

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Master Geek
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  Reply # 715168 10-Nov-2012 14:56 Send private message

What road are you on .. Possible being out that way your on a conklin cab or asam from pirongia exch



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Master Geek
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  Reply # 715467 11-Nov-2012 15:56 Send private message

I've had Prequals run which confirm that I'm not on a Conklin (thank god), but I cannot confirm where my internet is actually coming from. The residence is on Finlayson Rd and I'm pretty sure that the internal wiring is fine because we had a completely new line put in from the road side to all new internal house wiring about 9 years ago (the contractors new what they were doing).

I did have a link to a map somewhere that showed where all the cabinets were, I guess I'll only know what I'm connected to when they send out a technician.

I can provide a screenshot of the Prequal test if that would help.

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Uber Geek
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  Reply # 715469 11-Nov-2012 16:03 Send private message

Incindre: I've had Prequals run which confirm that I'm not on a Conklin (thank god), but I cannot confirm where my internet is actually coming from. The residence is on Finlayson Rd and I'm pretty sure that the internal wiring is fine because we had a completely new line put in from the road side to all new internal house wiring about 9 years ago (the contractors new what they were doing).

I did have a link to a map somewhere that showed where all the cabinets were, I guess I'll only know what I'm connected to when they send out a technician.

I can provide a screenshot of the Prequal test if that would help.


This should tell you what cabinet you are connected to.

Nine year old internal wiring almost certainly predates what is required for ADSL, so performing an isolation test at the very least should be high on your list of priorities.

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  Reply # 715473 11-Nov-2012 16:20 Send private message

The fact your wiring is 9 years old means wiring has to be looked at as a possible cause of the problem, because it could well be the cause.

Odds are your wiring is daisy chained between jackpoints. This causes reflections on the line which can only be eliminated with a master filter. Any more than 4 jackpoints any the degredation is enough to cause significant degredation of ADSL2+ connection. The fact you are some distance from the exchange would compound this issue.

The first thing you need to do is perform an isolation test to eliminate your internal wiring. If that improves your connection you'll need to install a master filter to improve things permanently.



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Master Geek
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  Reply # 715481 11-Nov-2012 16:30 Send private message

That doesn't really tell me anything Runningman, except that I'm within the exchange zone.
I HAVE done comprehensive isolation tests (as my original post states) and there was no difference between jack points.
Also, I just want to remind everyone that all was fine(ish) until about a month and a half ago, and the problem gets worse at peak times, so unless my wiring is sentient and enjoys slacking off then I can't see that being the problem (We used CAT5 for everything by the way).

I've just had Interleaving turned off again and my downloading speed has dropped from 2.0mbps average to 1.4mbps average. I'll do tests tonight to see how it affects my stability.

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  Reply # 715484 11-Nov-2012 16:56 Send private message

Hi just because you used cat5 does not mean its wired best for DSL. If its star wired which is the norm for voice purposes then you will still get line tap or stub issues which only a master filter with a dedicated pair to the modem can fix.

Cyril



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Master Geek
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  Reply # 715493 11-Nov-2012 17:23 Send private message

Update:

It appears I was wrong, the cable from the road was twin pair phoneline copper. This cable terminates at the house and all jackpoints originate from this same point (not daisy chained).

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  Reply # 715496 11-Nov-2012 17:27 Send private message

Hi, so its star wired, which is the worst for DSL

Cyril

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Uber Geek
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  Reply # 715497 11-Nov-2012 17:29 Send private message

Incindre: That doesn't really tell me anything Runningman, except that I'm within the exchange zone.

Apologies, I thought that you were trying to establish if you were connected to a cabinet that was nearby.

Incindre:
I HAVE done comprehensive isolation tests (as my original post states) and there was no difference between jack points.


Your original post indicates you have tried various jackpoints etc, but have you connected a modem directly to the ETP as sbiddle has recommended, thereby isolating ALL your internal wiring?

Incindre:
Also, I just want to remind everyone that all was fine(ish) until about a month and a half ago, and the problem gets worse at peak times, so unless my wiring is sentient and enjoys slacking off then I can't see that being the problem (We used CAT5 for everything by the way).

I've just had Interleaving turned off again and my downloading speed has dropped from 2.0mbps average to 1.4mbps average. I'll do tests tonight to see how it affects my stability.


The fact that the line slows down with interleaving off suggests that it is a wiring issue of some sort. Normally turning off interleaving increases the speed, but makes the line less resilient to errors. If your speed drops with interleaving turned off, it suggests a high error rate on the line meaning data is probably being resent.

There are things such as temperature fluctuations, external inference that can occur at certain times of the day that would present as a problem at peaks times, but may be physical wiring based problems, rather than IP routing or congestion problems.

Given your very high loop attenuation, then making sure the physical wiring is up to scratch first is quite important before commencing other testing - that is why everyone here is suggesting this is looked at first.

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