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MX204 DC Power System

MX204 Router DC Power Specifications

Table 1 lists the DC power system electrical specifications.

Table 1: DC Power System Electrical Specifications



DC input voltage

Operating range: –40 through –72 VDC

DC system input current rating

20 A @ –44 VDC (maximum)

DC system input power

331 W

7.75 A @ –44 VDC

Table 2 lists the DC power supply electrical specifications.

Table 2: DC Power Supply Electrical Specifications



Maximum output power

650 W

DC input voltage

Minimum: –40 VDC

Nominal: –48 VDC, –60 VDC

Operating range: –40 to –72 VDC

DC input current rating

20 A @ –44 VDC

DC Power Circuit Breaker Requirements for the MX204 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 25 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 25 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 MX204 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 MX204 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 1: DC Power Cable LugDC Power Cable Lug

Before you install the router, 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: 14-16 AWG (2.08 - 1.3 mm2), minimum 60° C wire, or as required by the local code.