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Power Supply Description

The router uses either AC or DC power (see Figure 1 and Figure 2). The power supplies are internally connected to the midplane, which distributes the different output voltages they produce throughout the system and its components.

An enable control signal on the output connector ensures that the power supply is fully seated into the router midplane before the power supply can be turned on. The enable pin prevents a user-accessible energy hazard, so there is no interlocking mechanism. The enable pin disables the voltage at the output connector if the power supply is not turned off before removal.

On an M7i router, if two power supplies are installed, they are fully redundant and share the load during normal operation. A single power supply can provide full power for as long as the router is operational. Redundancy is necessary only if one of the power supplies fails.

On an M10i router, if three AC power supplies or four DC power supplies are installed, they are fully redundant and share the load during normal operation. Two power supplies can provide full power for as long as the router is operational. Redundancy is necessary only if one of the power supplies fails.

Power supplies are hot-removable and hot-insertable. Each power supply has a handle to facilitate removal from the chassis. When one power supply fails or is switched off, the remaining power supplies immediately and automatically assume the entire electrical load.

Each power supply has an LED that indicates power supply status. Table 3 describes the LED states.

For a complete list of safety warnings for this router, including translations, see the hardware guide for your router at https://www.juniper.net/techpubs/hardware/.

Do not leave a power supply slot empty for more than a short time while the router is operational. The power supply must remain in the chassis for proper airflow.

Figure 1: AC Power Supply

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Figure 2: DC Power Supply

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Power Supply Specifications

Table 1 and Table 2 list the electrical specifications for AC and DC power supplies.

Table 1: Electrical Specifications for AC Power Supply

Description	Specification
Maximum power output	293 WDC
AC input voltage	Nominal: 100, 120, 200, 208, 220, 240 VAC Operating range: 90 – 264 VAC
AC input line frequency	47–63 Hz
AC input current rating	6–3 A
Output voltages	+3.3 V @ 40 A, +2.5 V @ 20 A, +5.0 V @ 15 A, +12 V@ 3 A

Table 2: Electrical Specifications for DC Power Supply

Description	Specification
Maximum power output	293 W
DC input voltage	Nominal: –48 , –60 VDC Operating range: –40.5 to –72 VDC
Input DC current rating	10 A @ –48 V
Output voltages	+3.3 V @ 40 A, +2.5 V @ 20 A, +5.0 V @ 15 A, +12 V@ 3 A

Power Supply LED

Table 3 describes the LED on both AC and DC power supplies.

Table 3: States for Power Supply LED

Label	Color	State	Description
OUTPUT OK	Green	On steadily	Power supply is functioning normally, input is occurring, outputs are within range, and the temperature is within range.
OUTPUT OK	Green	Blinking	Power supply is starting up, is not properly inserted, or airflow is not sufficient.

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