Rogers explains ???shaping' policy

[Lennart Sorensen]

On Thu, Jun 12, 2008 at 06:00:18PM -0400, James Knott wrote:
> There are also technical reasons why asymmetrical service is easier to 
> provide.  One is the amount of bandwidth allocated to upload, bearing in 
> mind this technology was developed long before cable internet access.  
> Another issue is resolving contention between users.  When downloading, 
> the data is simply sent out on the wire as quickly as possible.  On the 
> upload side, there has to be some method of ensuring all users properly 
> share the available bandwidth.

Yeah certainly cable modems have a large pipe for downloads shared
between all users on a segment, while uploads are in multiple smaller
channels.  Given not everyone is going to be downloading at the same
time, it does mean you get more download than upload speed.

For ADSL I am not sure.  I don't believe there is any real difference in
line quality required for say 5MBit/800kbit ADSL versus 2.2Mbit SDSL,
but maybe that isn't true.  Of course many people would probably pick
the ADSL 5Mbit over the SDSL 2.2Mbit given the choice, while a few would
want the SDSL instead.

-- 
Len Sorensen
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