A backbone network is the core infrastructure of a network that connects several major network components together. A backbone system is usually a high-speed communications network such as ATM or FDDI. The EVDO system uses a backbone network that can provide end-to-end IP transmission capability.

Backbone network is a communications network that connects the primary switches or nodes within the network. The backbone network is usually composed of high-speed switches and communication lines.

The focus on using IP communication allows carriers to use off-the-shelf IP network equipment. This typically lowers the equipment cost (due to a large selection of vendors and equipment options), reduces operation and maintenance costs due to one type of system to maintain (less training and processes), and allows for the use of standard software (traffic monitoring and management).