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3. Verify that an external management device is connected to one of the Routing Engine

ports on the CIP (AUXILIARY, CONSOLE, or ETHERNET). For more information about

connecting management devices, see “Overview of Connecting the T640 Router to

External Devices” on page 209.

4. Turn on the power to the external management device.

5. Switch on the customer site circuit breakers to provide voltage to the DC power source

cables.

6. For a three-input 240-A DC power supply in 2–INPUT mode, four-input 240-A DC, or

six-input DC power supply, verify that the INPUT PRESENT LEDs on the power supply

faceplate are lit steadily, indicating that the inputs are receiving power.

7. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect

the strap to one of the ESD points on the chassis.

8. Switch the circuit breakers on the two-input 160-A, three-input 240-A, or four-input

240-A DC power supply faceplate to the on position (|), or the power switch on the

AC power supplies or six-input DC power supplies to the on position.

NOTE: After a power supply is powered on, it can take up to 60 seconds

forstatusindicators—such as the LEDs on the powersupply, the command

output displays, and messages on the LED display on the craft interface—to

indicate that the power supply is functioning normally. Ignore error

indicators that appear during the first 60 seconds.

9. For the two-input 160-A, three-input 240-A, or four-input 240-A power supplies, verify

that the CB ON LEDs on the power supply faceplate are lit steadily. The CB ON LEDs

blink momentarily, then light steadily to indicate that the circuit breakers are on.

10. Verify that the DC OK LED on the power supply faceplate is lit steadily, indicating that

the power supply is correctly installed and is functioning properly.

NOTE: If any of the output status LEDs do not light steadily, repeat the

installation and cabling procedures.

11. On the external management device connected to the Routing Engine, monitor the

startup process to verify that the system has booted properly.

T640 Core Router Hardware Guide

Juniper T640 Hardware Guide

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