Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

365 posts

Ultimate Geek
+1 received by user: 2

Topic # 7252 31-Mar-2006 20:54
Send private message


I was just wondering if my line would support the new 3.5M/512k plans because from what I can see in my ADSL router settings, it shows that my DSL line DS speed is 2560k and US speed is 160k - both of which are well below the said 3.5M and 512k respectively.

It would be pointless for me to pay more than what I'm already paying to get only 2.5M down as opposed to 3.5M and only 160k as opposed to the promised 512k.

I just wanted to make sure before I sign up.

Any help would be greatly appreciated.

By the way, the DSL line in my previous house showed something along the lines of 7000+k down (can't remember the exact figure) and 300+k up.


Create new topic
50 posts


  Reply # 31940 1-Apr-2006 00:12
Send private message

I think those are bandwidth assigned to you by the exchange, they are higher because they need to factor in the ATM packet overheads.

1318 posts

Uber Geek
+1 received by user: 5


  Reply # 31970 1-Apr-2006 15:03
Send private message

Hypernova: I think those are bandwidth assigned to you by the exchange, they are higher because they need to factor in the ATM packet overheads.

Yep, that's correct. ATM uses small 53-byte cells (40 byte payload, 13 byte headers) whereas PPP frames are up to 1,500 bytes. These need to be chopped up into smaller units for transport over the underlying ATM link. It's known as the "ATM cell tax" and means that out of a nominally 155Mbit/s ATM STM-1 link, you can only fit around 120-125Mbit/s worth of IP traffic (depending on the frame sizes on the circuit). So, Telecom compensates for the overhead with higher linkspeeds.

Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

Intel introduces new NUC kits and NUC mini PCs
Posted 16-Aug-2018 11:03

The Warehouse leaps into the AI future with Google
Posted 15-Aug-2018 17:56

Targus set sights on enterprise and consumer growth in New Zealand
Posted 13-Aug-2018 13:47

Huawei to distribute nova 3i in New Zealand
Posted 9-Aug-2018 16:23

Home robot Vector to be available in New Zealand stores
Posted 9-Aug-2018 14:47

Panasonic announces new 2018 OLED TV line up
Posted 7-Aug-2018 16:38

Kordia completes first live 4K TV broadcast
Posted 1-Aug-2018 13:00

Schools get safer and smarter internet with Managed Network Upgrade
Posted 30-Jul-2018 20:01

DNC wants a safer .nz in the coming year
Posted 26-Jul-2018 16:08

Auldhouse becomes an AWS Authorised Training Delivery Partner in New Zealand
Posted 26-Jul-2018 15:55

Rakuten Kobo launches Kobo Clara HD entry level reader
Posted 26-Jul-2018 15:44

Kiwi team reaches semi-finals at the Microsoft Imagine Cup
Posted 26-Jul-2018 15:38

KidsCan App to Help Kiwi Children in Need
Posted 26-Jul-2018 15:32

FUJIFILM announces new high-performance lenses
Posted 24-Jul-2018 14:57

New FUJIFILM XF10 introduces square mode for Instagram sharing
Posted 24-Jul-2018 14:44

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.