• Supported Platforms
• T640 Routers

• Related Topics
• T640 Three-Phase Delta and Wye AC Power Supply Overview
• Overview of Connecting the T640 Router to Management and Alarm Devices
• Connecting AC Power to a T640 Router with Three-Phase Delta AC Power Supplies
• Connecting AC Power to a T640 Router with Three-Phase Wye AC Power Supplies
• Powering Off a T640 Router
• T640 Preventing Electrostatic Discharge Damage
• General Electrical Safety Guidelines and Electrical Codes for M Series, MX Series, and T Series Routers
• T640 AC Power Electrical Safety Guidelines
• T640 Preventing Electrostatic Discharge Damage

Powering On an AC-Powered T640 Router

You can use this procedure for a router with either three-phase delta AC power supplies or three-phase wye AC power supplies. To power on the AC-powered router:

1. Verify that the power supplies are fully inserted in the chassis and that the captive screws on their faceplates are tightened.
2. Verify that the AC power cords are connected correctly.
3. Verify that an external management device is connected to one of the Routing Engine ports on the CIP (AUXILIARY, CONSOLE, or ETHERNET).

   Note: If you are powering on the router for the first time, the ETHERNET port does not function until after the initial configuration procedure.

4. Turn on the power to the external management device.
5. Switch on the dedicated customer site circuit breakers to provide power to the AC power cables. Follow your site’s procedures.
6. Verify that the AC OK LED on both AC power supply faceplates are lit steadily green, indicating that the power supplies 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 power switch on one of the power supplies to the ON position (|). The DC OK LED blinks momentarily, then lights steadily.

   Note: After a power supply is powered on, it can take up to 60 seconds for status indicators—such as the output status LEDs on the power supply, the command output, and messages on the LCD on the craft interface—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.

9. Verify that the DC OK LED on the AC power supply faceplate is lit steadily, indicating that power supply is correctly installed, functioning properly, and providing power to the DC outputs.
10. On the external management device connected to the Routing Engine, monitor the startup process to verify that the system has booted properly.

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, you must power off the router before powering it on again. After powering on a power supply, wait at least 60 seconds before turning it off. After powering off a power supply, wait at least 60 seconds before turning it back on.