What BB service are you on and what modem are you using.
If you are using a router try connecting direct to eliminate the router from the equation.
Can you open your browser with
http://root:root@192.168.100.1 click on 'login'
Now let us know what it says the values for:-
Downstream Modulation
Downstream SNR
Downstream Receive Power Level
Upstream transmit Power Level
Maximum Downstream Data Rate
Maximum Upstream Data Rate