This "its impossible" is the real problem. The satellite link can in theory handle 1024 down and 128 up but the number of ports available can't. The truth is that the contention ratios which should be at about a maximum of 20 to 1 are in fact at about 80 to 1 on the standard packages and I suspect more than that.
The catch is that, if you can't get access to a landline, your choice is limited to this or a GPRS solution and if you move large quantities of data a GPRS solution can be very expensive on a monthly basis. Rock and a hard place sums it up.