The router uses DC power. There are two load-sharing, pass-through power supplies located at the bottom rear of the chassis, as shown in Figure 1. The power supplies connect to the midplane, which distributes power to router components according to their individual voltage requirements. When the power supplies are installed and operational, they automatically share the electrical load. If a power supply stops functioning for any reason, the remaining power supply instantly begins providing all the power the router needs for normal functioning and can provide full power indefinitely.
Figure 1: Rear of Chassis with Component Cover in Place
Power supplies are hot-removable and hot-insertable. To avoid electrical injury, carefully follow the instructions in Replacing a DC Power Supply.
Note: After powering off a power supply, wait at least 60 seconds before turning it back on. After powering on a power supply, wait at least 60 seconds before turning it off.
Note: If the system is completely powered off when you power on the power supply, the Routing Engine boots as the power supply completes its startup sequence. If the Routing Engine finishes booting and you need to power off the system again, first issue the CLI request system halt command. For more information, see Disconnecting DC Power from the Router.
Note: After a power supply is powered on, it can take up to 60 seconds for status indicators—such as LEDs on the power supply, show chassis commands, and messages on the craft interface LCD—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.
See the following sections for further information: