Main types of cable:
Each variety can be used as a trunk or drop line. The smaller a variety is, the smaller its bend radius can be. This allows the cable to fit in more complex places. Smaller round line can limit throughput, though.
Flat cable is the recommended cable for a DeviceNet trunk line. It is comprised of a line of wires rather than a bundle. The insulating plastic is also formed to fit specific connectors, making flat cable a great solution for a fully compatible network with fewer custom components.
Unshielded drop cable is not actually flat cable, but is made to work with flat cable specifically. Unshielded drop cable is made solely for drop lines and is made up of 4 unshielded conductors.