how can i play xbox live im having trouble, i have this modem by virgin

[i say lol 2 much! lol]

http://www.simplehelp.net/images/cable? it only has 1 enternet cable with it, can any one help me on how to connect to xboxlive?
thank u
sorry the link above didnt show it
its this one
http://www.simplehelp.net/images/cable_modems/scientificatlanta_dpc2100.gif

[uunknown11@rocketmail.com]

i have silmalar to that, it even has 1 enternet too, but should u buy new router, connect it.
it will affect little bit.