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512kbps account or not?

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512kbps account or not?

if my account is of this type:
512Kbps
Then why do I always connect at 576kbps ??
Regardless of what adsl modem used.
3 REPLIES
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RE: 512kbps account or not?

512 is the usable Layer 3 bandwidth.

ADSL is a ATM service. This means, it is one service, eg voice, data, video, tunneled through another.

As with all services, they each have overheads. These are parts of the data that contain destination, debug, messages, id numbers and other protocol related information.

As such, you can see how much it uses.
N/A

RE: 512kbps account or not?

> 512 is the usable Layer 3 bandwidth.
>
> ADSL is a ATM service. This means, it is one service, eg voice, data, video, tunneled through another.
>
> As with all services, they each have overheads. These are parts of the data that contain destination, debug, messages, id numbers and other protocol related information.
>
> As such, you can see how much it uses.

------------------
Erm .. in English ...
Whenever you download a file, it is split into chunks called packets to be sent across the internet. Each packet has to contain certain extra information such as where it came from and where it is heading - this is the overhead.
In practise, what this means is that e.g. a 1Mb download might actually require your system to download 1.3Mb of data. That's why your connection speed of 576kbps is a figure that contains all the packet overhead, which then gives you a nominal actual real life download speed of 512kbps.

Hope this answers the question.

--
Come on Boro!
http://www.waynessa.co.uk/boro.htm
N/A

RE: 512kbps account or not?

This is the ATM ovehead, and not the TCP/IP overhead.

TCP/IP data and header takes place within the 512kb portion of the bandwidth.