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424 posts

Ultimate Geek

Chorus NZ

  # 75967 26-Jun-2007 13:19
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action 55, there is a spreadsheet someone posted somewhere on Geekzone which has phone prefixes versus exchanges.  Have a look around.

xlinknz, your connection speed is at maximum for dsl1, so you will definetely get alot faster connection rate when you get 2+ I would think.  But the speed at which data comes down that pipe depends on how much of a connection the exchange has and how many people are using it at any one time.  You will probably get low download speeds during the day, but if you tried it at 3 am, you would probably get something like 6 meg or more.

For a very basic example, say you have 100 people on an exchange (or DSLAM to be more accurate).  All with 10 meg connections (yeah right), but only 100 meg feeding them at the DSLAM.  If everyone is online at the same time downloading hard out maximum they can, then they will only get 1 meg each.  If only 1 is online downloading at max they will get the full 10.  So it's basic math pretty much.  I'm sure it's much more complicated (for example, you surf and even download in bursts, there are overheads etc) but you get the point.

I like using the garden hose example.  The hose itself is your connection and may be really big, but how much water goes down it, depends on how big all the pipes that come before it are, and how many people have patched into it etc.

Oh well, that's enough of me vaguely sounding like I know what I'm talking about!

851 posts

Ultimate Geek


  # 75975 26-Jun-2007 15:24
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cyril7: Based on your downstream attenuation I would say you are somewhere between 1.5-2km from the DSLAM, therefore you should expect to be able to double your line rate, naturally if they dont increase the backhaul behind it then you will still get the same old 2.6Mb/s throughput.


I'm in J'Ville Wellington and as the crow flies approx 1km from the real exchange but I suspect a cabinet in between.

So the reason I don't get 7.6Mbit now is because of the backhaul or distance from the DSLAM ?

My point being if the back haul isn't the issue but distance will I get more than 2.6Mbit ?


6958 posts

Uber Geek


  # 75980 26-Jun-2007 16:12
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If you have a connection speed of 7.6Mb/s but a test speed of 2.6Mb/s then either the reported connection speed is inaccurate or highly errored or the backhaul is limiting things. I put my money on the latter.

I have a reported 6.4Mb/s connection, however have never seen more than 2.5Mb/s throughput, and according to my modems logs, there were virtually no dropped or bad packets, therefore it can only be assumed to be the backhaul.


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