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play_arrow Fast Track: Initial Installation
- Fast Track to Rack Installation and Power
- Onboard, Configure, and Monitor MX960
play_arrow Overview
- play_arrow System Overview
  - MX960 Router Overview
- play_arrow Chassis Components and Descriptions
- play_arrow Cooling System Components and Descriptions
  - MX960 Cooling System Description
  - MX960 Fan LED
- play_arrow Host Subsystem Components and Descriptions
- play_arrow Interface Modules—DPCs
- play_arrow Interface Modules—FPCs and PICs
- play_arrow Interface Modules—MPCs and MICs
- play_arrow Services Processing Card—MX-SPC3
  - Services Processing Card—MX-SPC3 Services Card
- play_arrow Power System Components and Descriptions
- play_arrow Switch Control Board Components and Descriptions
play_arrow Site Planning, Preparation, and Specifications
- play_arrow Preparation Overview
- play_arrow Transceiver and Cable Specifications
- play_arrow Pinout Specifications
- play_arrow AC Power Requirements, Specifications, and Guidelines
- play_arrow DC Power Requirements, Specifications, and Guidelines
- play_arrow High-Voltage Second-Generation Universal (HVAC or HVDC) Power Requirements, Specifications, and Guidelines
play_arrow Initial Installation and Configuration
play_arrow Installing and Replacing Components
- play_arrow Overview of Installing and Replacing Components
  - MX960 Field-Replaceable Units
  - Tools and Parts Required for MX960 Router Connections
- play_arrow Installing Components
- play_arrow Replacing Chassis Components
- play_arrow Replacing Cooling System Component
  - Replacing the MX960 Air Filter
  - Replacing an MX960 Fan Tray
- play_arrow Replacing Host Subsystem Components
- play_arrow Replacing Line Card Components
- play_arrow Replacing Power System Components
- play_arrow Replacing and Upgrading Switch Control Boards
play_arrow Maintaining the Chassis and Components
- play_arrow Routine Maintenance Procedures
  - Routine Maintenance Procedures for the MX960 Router
- play_arrow Maintaining Components
- play_arrow Converting to a Different Type of Power Supply
  - Converting from AC to DC Power Supplies on an MX960 Router
  - Converting from DC to AC Power Supplies on an MX960 Router
play_arrow Troubleshooting Hardware
- play_arrow Knowledge Base
  - https://kb.juniper.net/
- play_arrow Troubleshooting Components
play_arrow Contacting Customer Support and Returning the Chassis or Components
- play_arrow Contacting Customer Support
  - Contact Customer Support
- play_arrow Locating Component Serial Numbers
- play_arrow Packing and Returning Components
play_arrow Safety and Compliance Information
- play_arrow General Safety Guidelines and Warnings
- play_arrow Installation and Maintenance Safety Guidelines and Warnings
- play_arrow Radiation and Laser Warnings
  - Laser and LED Safety Guidelines and Warnings
  - Radiation from Open Port Apertures Warning
- play_arrow Maintenance and Operational Safety Guidelines and Warnings
  - Maintenance and Operational Safety Guidelines and Warnings
- play_arrow Electrical Safety Guidelines and Warnings
- play_arrow Agency Approvals and Compliance Statements

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Converting from DC to AC Power Supplies on an MX960 Router

date_range 17-Feb-25

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The conversion of an MX960 router from AC to DC or DC to AC should be performed with the system completely powered off. A system cannot operate with a mix of AC and DC power supplies. This procedure assumes conversion from normal-capacity power supplies to high-capacity power supplies.

Remove MX960 normal-capacity DC power supplies for power supply in slots 0, 1, 2, 3 where present. All power supplies should be removed proceeding with the installation of the AC power supplies. To convert from DC to AC, use the following procedures.

To remove a normal-capacity DC power supply (see Figure 1):

Switch off the dedicated customer site circuit breaker for the power supply being removed. Follow your site's procedures for electrostatic discharge (ESD).
Move the DC circuit breaker on the power supply faceplate to the off (O) position.
Verify that the INPUT OK LEDs on the power supply to be removed are not lit. Also verify that the BREAKER ON LED is not lit.
Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cables might become active during the removal process.
Remove the clear plastic cover protecting the terminal studs on the faceplate from the power supply in slot 0.
Remove the nut and washer from each of the terminal studs. (Use a 7/16-in. [11-mm] nut driver or socket wrench.)
Loosen the captive screw on the cable restraint on the lower edge of the power supply faceplate.
Remove the cable lugs from the terminal studs.
Carefully move the power cables out of the way.
While grasping the handle on the power supply faceplate with one hand, use your other hand to pull the spring-loaded locking pin in the release lever away from the chassis and turn the release lever counterclockwise until it stops.
Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding hole in the chassis.
Pull the power supply straight out of the chassis (see Figure 1).

Warning:
Do not touch the power connector on the top of the power supply. It can contain dangerous voltages.
Repeat steps 1-12 for power supplies in slot 1, 2, and 3, where present.
Figure 1: Removing a DC Power Supply from the MX960 Router

Note:
The chassis is shown without the extended cable manager.

Use the following procedures to install the MX960 high-capacity AC power supplies, the high-capacity second-generation AC power supplies, or the high-voltage second-generation universal power supplies in slots 0, 1, 2, and 3, where present.

Note:

During the upgrade process, you can simultaneously run normal-capacity and high-capacity power supplies. However, it is recommended to upgrade all power supplies to high-capacity power supplies.

To install an MX960 high-capacity AC or high-capacity second-generation power supply, use the following procedure (see Figure 2).

Verify that the power switch on the power supply is in the off (O) position.
Ensure that the release lever below the empty power supply slot is locked in the counterclockwise position (see Figure 2).

Figure 2: MX960 with High-Capacity AC Power Supplies Installed

Note:
The chassis is shown without the extended cable manager.
Figure 3: Rear View of a Fully Configured AC-powered High-Capacity Second-Generation Powered MX960 Router Chassis

  1
—
Air exhaust
  4
—
Power supply ejectors
  2
—
Power distribution unit cover
  5
—
Grounding points
  3
—
High-capacity second-generation AC power supplies
  6
—
ESD point

Note:
The chassis is shown without the extended cable manager.
If necessary, pull the spring-loaded locking pin in the release lever away from the chassis and turn the release lever counterclockwise until it stops. Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding hole in the chassis.
On the power supply, rotate the metal cover away from the input mode switch to expose the switch.
Move the input mode switch to position 0 for one feed or position 1 for two feeds (see Figure 4).

Figure 4: MX960 AC Power Input Mode Switch

Figure 5: Setting the Input Mode Switch (DIP Switch) on High-Capacity Second-Generation AC PSM

1
—
Position 1 setting
2
—
Position 0 setting

CAUTION:
Do not use a pencil, because fragments can break off and cause damage to the power supply.
Using both hands, slide the power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate will protrude beyond the chassis.

The small tab on the metal housing that is controlled by the release lever must be inside of the corresponding slot at the bottom of the power supply (see Figure 4). This tab is used to pull the power supply down in the chassis slot, prior to removing the power supply.
While firmly pushing the handle on the power supply faceplate with one hand, use your other hand to pull the spring-loaded locking pin in the release lever away from the chassis and turn the release lever clockwise until it stops.
Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding hole in the chassis.
Attach the cover on the power distribution unit on the chassis for the high-capacity second-generation AC power supply.
Make sure the grounding cable is attached, see Grounding the MX960 Router.
Locate a power cord with the type of plug appropriate for your geographical location (see AC Power Cord Specifications for the MX960 Router).
Plug the power cord into the corresponding appliance inlet located in the chassis directly above the power supply. This is the recommend receptacle when using the power supply in one feed mode. If using the power supply in two-feed mode, plug the second power cord into the receptacle on the power supply. For the high-capacity second-generation PSM, use a screwdriver to tighten the screw on the retainer to prevent the AC cord from getting lose. See Figure 6

Figure 6: MX960 with One High-Capacity Second-Generation AC Power Feed Connected

Note:
Each power supply must be connected to a dedicated AC power feed and a dedicated customer site circuit breaker.
Dress the power cord appropriately. Verify that the power cord does not block the air exhaust and access to router components, and that they do not drape where people could trip on them.
Move the AC input switch above the power supply to the on (—) position. This is the only switch you have to turn on if you are using the power supply in one feed mode. If using the power supply in two-feed mode, move the power switch on the power supply to the on position. Remember to turn on both switches when operating the power supply in two-feed mode.
If the power supply is correctly installed and functioning normally, the AC1 OK, AC2 OK (two-feed mode only), and DC OK LEDs light steadily, and the PS FAIL LED is not lit. See Table 1.

Repeat steps 1-12 for installing power supplies in slots 1, 2, and 3, where present.

Table 1: MX960 or High-Capacity Second-Generation AC Power Supply LEDs
Connected Inputs	DIP Switch Position	LEDs
Connected Inputs	DIP Switch Position	INP0 OK	INP1 OK	DC OK	PS FAIL
INP0 connected, INP1 disconnected	0 (1 input)	Green	Off	Green	Off
INP0 disconnected, INP1 connected	0 (1 input)	Off	Green	Green	Off
INP0 connected, INP1 connected	0 (1 input)	Green	Green	Green	Off
INP0 connected, INP1 disconnected	1 (2 inputs)	Green	Off	Off	Red
INP0 disconnected, INP1 connected	1 (2 inputs)	Off	Green	Off	Red
INP0 connected, INP1 connected	1 (2 inputs)	Green	Green	Green	Off

To install and power on an MX960 universal (HVAC or HVDC) power supply, use the following procedure (see Figure 7).

Verify that the power switch on the power supply is in the off (O) position.
Ensure that the release lever below the empty power supply slot is locked in the counterclockwise position (see Figure 7).

Figure 7: MX960 with High-Voltage Second Generation Power Supplies Installed

Note:
The chassis is shown without the extended cable manager.
If necessary, pull the spring-loaded locking pin in the release lever away from the chassis and turn the release lever counterclockwise until it stops. Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding hole in the chassis.
On the power supply, rotate the metal cover away from the input mode switch to expose the switch.
Using both hands, slide the power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate protrudes beyond the chassis.

The small tab on the metal housing that is controlled by the release lever must be inside of the corresponding slot at the bottom of the power supply (see Figure 7). This tab is used to pull the power supply down in the chassis slot, prior to removing the power supply.
While firmly pushing the handle on the power supply faceplate with one hand, use your other hand to pull the spring-loaded locking pin in the release lever away from the chassis and turn the release lever clockwise until it stops.
Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding hole in the chassis.
Make sure the cover is installed on the power distribution unit of the chassis, see Figure 8.

Figure 8: Installing the Cover on the Chassis
Make sure the grounding cable is attached, see Grounding the MX960 Router.
Locate a power cord with the type of plug appropriate for your geographical location (see High-Voltage Second-Generation Universal (MX960-PSM-HV) Power Cord Specifications for the MX960 Router).
Plug the power cord into the corresponding appliance inlet located in the chassis directly on the power supply.

Note:
Each power supply must be connected to a dedicated power feed and a dedicated customer site circuit breaker.
Figure 9: MX960 with a High-Voltage Second-Generation (HVAC or HVDC) Power Feed Connected
Dress the power cords appropriately. Verify that the power cord does not block the air exhaust and access to router components, and that they do not drape where people could trip on them.
Move the input switch above the power supply to the on (—) position.

Figure 10: MX960 Power Input Mode Switch
If the power supply is correctly installed and functioning normally, the INP OK, DC OK LEDs light steadily, and the PS FAIL LED is not lit.
Repeat steps 1-12 for installing power supplies in slots 1, 2, and 3, where required.
Install a blank panel over the power distribution modules, if available.

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1 — Air exhaust	4 — Power supply ejectors
2 — Power distribution unit cover	5 — Grounding points
3 — High-capacity second-generation AC power supplies	6 — ESD point

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