Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


MX10003 DC Power System

MX10003 DC Power System Description

The MX10003 uses either AC or DC power supply modules (see Figure 1). The router contain six power supplies located at the rear of the chassis in slots PSM0 through PSM5. The AC or DC power supplies directly plug into the midplane and are placed symmetrically on both sides of the chassis for better thermal management. Each power supply has a handle, an ejection lever, and a status LED. The power supplies connect to the baseboard, which distributes the different output voltages produced by the power supplies to the router components, depending on their voltage requirements. A minimum of 3 power supplies are required for non-redundant operation. If one power supply in a redundant configuration fails or is removed, the remaining power supplies assume the entire electrical load without interruption. See MX10003 Component Redundancy for more information on power redundancy supported on the AC and DC powered router. Each power supply is cooled by its own internal cooling system. The chassis is designed to support N+N mode with feed redundancy, and N+1 mode without feed redundancy.

Redundant power supplies are hot-removable and hot-insertable. When you remove a power supply from a router that uses only one power supply, the router might shut down depending on your configuration.


Do not mix AC and DC power supplies in the same chassis.


Routers configured with only one power supply are shipped with a blank panel installed over the power supply slot that is not populated.

Each DC power supply weighs approximately 4.4 lb (1.99 kg) and consists of a handle, an ejector lever, a status LED, and a terminal block that provides a single DC input (–48 VDC and return) that requires a dedicated customer-site circuit breaker. We recommend that you use a dedicated customer-site circuit breaker rated for 40 A (–48 VDC) minimum, or as required by local code.

Figure 1 shows the power supply.

Figure 1: DC Power SupplyDC Power Supply

MX10003 DC Power Supply Module LEDs

Figure 2 shows the DC power supplies components along with the status LED.

Figure 2: DC Power Supplies ComponentsDC Power Supplies Components
Ejector lever
DC inlet cable lug point
Status LED

MX10003 Router DC Power Specifications

Table 1 lists the DC power supply electrical specifications.

Table 1: DC Power Supply Electrical Specifications



Maximum output power

1100 W

DC output voltage Nominal: 12VDC

DC input voltage

Minimum: –40 VDC

Nominal: –48 VDC, –60 VDC

Operating range: –40 through –72 VDC

DC Power Circuit Breaker Requirements for the MX10003 Router

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 dedicated customer-site circuit breaker rated for 40 A (–48 VDC) minimum, or as required by local code. Doing so enables you to operate the router in any configuration without upgrading the power infrastructure.

If you plan to operate a DC-powered router at less than the maximum configuration and do not provision a 40 A (–48 VDC) circuit breaker, we recommend that you provision a dedicated customer-site circuit breaker for each DC power supply rated for at least 125 percent of the continuous current that the system draws at –48 VDC.

DC Power Source Cabling for MX10003 Router

The DC power supply in PS0 must be powered by a dedicated power feed derived from feed A, and the DC power supply in PS1 must be powered by a dedicated power feed derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system.


You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.


For field-wiring connections, use copper conductors only.


Power cords and cables must not block access to device components or drape where people could trip on them.

DC Power Cable Specifications for MX10003 Router

DC Power Cable Lug Specifications

The accessory box shipped with the router includes the cable lugs that attach to the terminal of each power supply.

Figure 3: DC Power Cable LugDC Power Cable Lug

Before router installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the router.

DC Power Cable Specifications

You must supply four DC power cables that meet the following specifications: 10-AWG (1.3 mm2), minimum 60° C wire, or as required by the local code.