Peter Fetterolf's paper explores and compares the TCO of Carrier Ethernet, Wavelength Services, and Dark Fiber, three primary DCI transport options, for enterprises requiring 100G and beyond of interconnect bandwidth. These comparisons are based on a three-node DCI network model and consider capital expenditures, operational expenditures, scalability, and architectural implications. The three-node network provides an example of an enterprise connecting three data centers.