Bonded T1 Lines offfer increased Dedicated Internet Access at capacities greater than the 1.54MB limit of a single T1 line, but less than the 45MB capacity leap in price to DS3.  Various carriers offer 2, 3, 4, 5 and 6 bonded T1 options.  Some carriers also offer the ability to bond DS3 lines for a combined capacity of 90MB bandwidth without the expense of moving up to 155MB OC3 capacities.