Monoprice 100096 3-Feet DCE/DTE DB60 Crossover Cable This cable is a 3ft V 35 DTE/DCE DB60-DB60 Crossover Back-to-Back Cable use d to connect Cisco 1600/1700/2500/2600/3600 (WIC-1T NM-4A/S NM-8A/S on the 2600 and 3600) Series routers via their serial ports to simulate Frame-Relay and other WAN topologies It is manufactured from China