Bloody XBox Live!... grrrrrr

[RC45]

OK XBox live guru's... let's see it for this one?

I have an XBox Live! compatible broadband router... appears on the list by name and firmware version.

When I connect the XBox to one of it's ethernet ports, the XBox does not even recognize a cable is connected...

But when I connect the XBox to a port on one of the switches I have upstream (on my home network) of the broadband router, the XBox sees the connection, but XBox Live! is unreachable...

So.... what do y'all suggest... ???????