Juniper Networks DC Power Supply Configurations for the MX240 Router, AC Power Supply LEDs

Chapter 2: Hardware Components

Table 17: AC Power Supply LEDs

Label	Color	State	Description
AC OK	Amber	Off	AC power input voltage is below 78 VAC.
	Green	On	AC power input voltage is within 78–264 VAC.
DC OK	Green	Off	DC power outputs generated by the power supply are not within the normal
			operating ranges.
		On	DC power outputs generated by the power supply are within the normal operating
			ranges.
PS FAIL	Red	Off	Power supply is functioning normally.
		On	Power supply is not functioning normally and its output voltage is out of regulation
			limits. Check AC OK and DC OK LEDs for more information.

DC Power Supply

Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated circuit breaker. We recommend that you use a minimum 40 A facility circuit breaker, or as required by local code.

Figure 16: DC Power Supply

For information about site power preparations, see “Power Guidelines, Requirements, and Specifications” on page 165. For information about connecting the router to power, see “Connecting Power to a DC-Powered Router” on page 56. For DC power electrical specifications, see “DC Power System Electrical Specifications” on page 167.

DC Power Supply Configurations for the MX240 Router

In the DC power configuration, the router contains either one or two DC power supplies (see Figure 16 on page 23) located at the rear of the chassis in slots PEM0

Power Supplies ■ 23