Your better ask your internet provider. In a cable modem 
system you share a segment with a number of other users, 
so the actual bandwith you get depends on other activity 
on your segment.  They cannot provide you a fixed bandwith 
as with DSL.  Do the test again during low traffic period 
(5 am for example) and you'll probably notice a 
difference.  If not, the problem is somewhere else, and 
I'm wrong :)

Cheers,

Olli

On Tue, 12 Dec 2006 21:04:30 -0700
  "Michael" <zlinda1002 at cox dot net> wrote:
> What would cause my download in 120 seconds to go from 
>227KB/s to 865KB/s
> then back down? The graph in m0n0wall has 20 of those 
>peaks in a 120 second
> frame. This happens with traffic shaper on or off. I 
>have a cox.net 12mb/1mb
> connection. My upload rate is 1.23Mbps, but the download 
>is more jagged than
> the mountains here in Arizona! Ack is prioritized in 
>upload queue 3 with a
> weight of 15, highest upload priority is 50. I never had 
>this problem with
> DSL, but I never had a 4mb+ connection either, only 
>1.5mbps.
> 
> Mike
> 
> 
> 
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