A link or portion of a network that carries traffic from the aggregation nodes of a network to the core network. DSL Example ---- DSL Subscriber ----> DSLAM ----> Central Office (CO). The portion of the network that connects the DSLAM, a type of aggregation node, to the CO is referred to as backhaul. Backhaul bandwidth may range from smaller than a T-1 to OC-N capacities. (less than 1.54Mbps to nearly 10Gbps) A relevant example is the role of the Middle Mile carrier. They provide backhaul connectivity between geographically separated networks that are owned/managed by the same company. Example - Level 3 provides backhaul to Cox Communications that connects their Phoenix and Tucson markets.