Expected Broadband Speeds

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GingerNinja

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#22359 25-May-2008 17:05

Hi all,

I am probably going to be getting Telstraclear PDQ Turbo (max down, 128 up) soon (but this is not certain yet, hence I haven't put this in the Telstraclear forum).

I was just wondering what speeds I could expect from this. The saleswoman didn't want to put a number on it since they don't want to promise something they can't deliver.

I am in St Andrews/Te Rapa in Hamilton. I will be getting the wiring installation to get a separate jackpoint for the broadband (have to since I have monitored alarm), if this affects it.

If anyone can give me ballpark speeds, that would be great!

Also, does anyone know if Hamilton has ADSL2+ yet?

Cheers.

Spyware

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#133153 25-May-2008 17:49

With 128 kbps up your max. download speed will be limited to maybe 4.5 Mbps irrespective of any other limitation, e.g., distance from exchange.

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GingerNinja

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#133476 27-May-2008 08:06

thanks Spyware.

So is the maximum download speed related to the upload speed?

Or does the Turbo plan (max down, 128 up) have an identical download speed to the Max plan (max down, max up)?

cyril7

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#133481 27-May-2008 08:27

On the typical latency that NZ DSL lines have, a 128k uplink will only give you enough acknowledgement speeds to result in around 4.5Mb/s download, no faster even if your line did go faster and the server/backhaul was capable of going faster

A max/max service can give you anything upto a 1Mb/s uplink which can support throughputs exceeding the ADSL2+ max down rate of >20Mb/s.

So first you have to determine you potential line snyc rate, this is distance and line condition related. From their you can determine you maximum potential rate.

Cyril

GingerNinja

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#133484 27-May-2008 08:30

I thought the download might be dependent on upload.

Cheers.

olof

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#136254 7-Jun-2008 17:22

GingerNinja: depends on a lot of factor. Currently writing a series of blog post on this question. First post is here.

As an example: I have recently moved in to a new house, and I am now 500m from the exchange. (I know I am very lucky!) My connect speed (ADSL line speed) is 17Mbps (down) and my top practical download speed (IP speed from speedtest.net etc) is approx 12Mbps. This is with ADSL2+ of course. If you are on ADSL and further from the exchange, your speeds will of course be much lower.

Some of the Hamilton exchanges have indeed been upgraded to ADSL2+. You can find Telecom NZ's ADSL2+ rollout schedule here.

Also keep in mind that while ADSL2+ is touted as 24Mbps, that is the theoretical line rate speed. Your practical speed will typically be much lower due to:

1) Distance from the exchange. (See my blog post.)

2) Quality of the local loop (wire from exchange to your house, you can do little about this)

3) Quality of the wiring in your house (you can fix this!)

4) Protocol overheads will reduce the speed by > 15% (depending on packet size). Essentially, ADSL and ADSL2+ services in NZ based on UBS all use IP over PPP over ATM over ADSL technology. The ATM and PPP overheads adds close to 15% overhead large packets (1500 bytes) and more for small packets.

In other words, it is a pretty hard question to answer! Send me an e-mail if you want to discuss! (Disclosure: I work for TelstraClear.)

Olof Olsson - my views are my own.

GingerNinja

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#136595 9-Jun-2008 08:15

Thanks Olof.

I am getting separate wiring installed for the broadband (since I have mon. alarm), so if the line is good from my house to the exchange it should be good.

According to the Transfield tech, the exchange is on the other side of the block. So following the roads around, this should be less than 1km (still to check this).