Crossover and straight-through cables are used in order to connect switch ports or interfaces to network devices. Consult this table in order to see when to use each of these cable types. Find the device in the left-hand column and match it up with another device in the top row. The intersection of these two devices gives you the cable type used to connect them together.
The Cisco CP-PWR-CORD-NA= Power Cable is specifically designed to power Cisco 7800 Series IP Business Phones. Localised for use in North America, this plug has one IEC 320 EN 60320 C13 male connector. The Cisco Power Cube 3 (CP-PWR-CUBE-3=) and Cisco Power Adapter 3 (CP-PWR-ADPT-3) require the use of this AC cable.