the cisco 3660 router can accommodate two ac or two dc power supplies (ps1 and ps2) in bays at the rear of the unit (see figure 6-1). each unit provides up to 250 watts of power, and a single installed power supply meets the router's requirements. the second installed power supply provides redundancy, load sharing, and increased system availability. it can be removed without affecting system operation.

    because the cisco 3660 router does not offer rps support, cisco recommends increasing system reliability by installing the second power supply.

    because the ac and dc power supplies are similar in appearance and follow the same hot-swap procedure, figure 6-1 applies to both types.

    do not touch the power supply when the power cord is connected. for systems with a power switch, line voltages are present within the power supply even when the power switch is off and the power cord is connected. for systems without a power switch, line voltages are present within the power supply when the power cord is connected. to see translations of the warnings that appear in this publication, refer to the regulatory compliance and safety information document that accompanied this device.