The Cisco StackPower cables are thick yet flexible, carrying power as well as a data signal to provide a communications channel among the switches in the power stack. StackPower and XPS cables are keyed and have coloured bands on the ends to help you understand which cable plugs into which switch or XPS.

A StackPower cable has coloured bands on the cable ends, green on one end and yellow on the other end. This cable can be used between Catalyst 3750-X switches and an XPS. Note that the connector with the blue band can only connect to a Catalyst 3750-X switch, while the connector with the yellow band can connect to a Catalyst 3750-X or an XPS.

An XPS cable also has a colour band on the cable ends, red on one end and yellow on the other end. This cable can only be used to connect a Catalyst 3750-X or 3560-X switch to an XPS. Note that the connector with the red band can only connect to an XPS, while the connector with the green and blue bands can connect to a Catalyst 3750-X or 3560-X switch.

The Cisco Catalyst 3750-X Series Switches come with four power supply options, and any of them can be used on any switch in a stack and in any combination.