you are wondering what is "contention ratio" then it is
basically a word for sharing. If you have seen that a broadband
provider has a contention ration of "50:1" and another
broadband provider has a contention ratio of "20:1" and
you don't know what this means or which one is best then it is quite
"contention ratio" is the maximum number of other people
you will have to share the connection infrastructure with. So a
contention ratio of 50:1 would mean that the maximum number of people
you could be sharing the connection with at anytime is 49 other
people. If all 50 people were downloading at the same time then
your download speed could drop hugely, in reality though this doesn't
happen and you can enjoy much faster download speeds.
from this you can see that a contention ratio of "20:1"
should be more beneficial although for most home users you shouldn't
have any problems with a contention ratio of "50:1" at
the future though as broadband/ADSL becomes even more widely used
the 50:1 contention ratio may not be enough but hopefully that issue
will be addressed hopefully before or when the time comes.