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# Powering Up

| Note: In this procedure we assume that the system is already connected to a power source. See Cabling the Router.

| Note: Juniper Networks has qualified an AC power supply unit for use with the router. Contact your account representative for more information.

For specifications on the electrical requirements for the system, see System Specifications. For details on the power consumed by the different modules, see the E120 and E320 Module Guide.

| Caution: Evaluate the overall loading of the branch circuit before you install any equipment into a rack.

To power up the system:

1. Verify that the power source is operational and turned on.
2. Inspect all grounding and power connections to the router chassis.
3. Confirm that all connections are secure.
4. Switch the power switches to ON.
5. Monitor the LEDs on the SRP modules and SFM modules to verify that the system is booting properly. See Table 11 for LED status explanations.

   When the prompt appears on the system console, the system is in User Exec mode and is ready to be configured:

   `
   host1>
   `
6. Enter the enable command to access Privileged Exec mode:
   `
   host1>enable
   host1#
   `

   In Privileged Exec mode you can begin to configure the system. See JUNOSe System Basics Configuration Guide, Chapter 2, Command-Line Interface for more information.

## Initialization Sequence

Each line module is initialized independently. As a result, the CLI on the SRP module can become available before the line modules have completed initialization. Commands relating to a line module might fail if the module has not completed initialization. You can use the show version command to display line module status, but do not enter commands for a line module until its state is online.

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