• Replacing an MX5, MX10, MX40, and MX80 DC Power Supply on page 143
• MX5, MX10, MX40, and MX80 DC Power Electrical Safety Guidelines
• MX5, MX10, MX40, and MX80 Routers DC Power Specifications on page 59
• DC Power Circuit Breaker Requirements for the MX5, MX10, MX40, and MX80 Routers
on page 62
• DC Power Source Cabling for MX5, MX10, MX40, and MX80 Routers on page 62
• DC Power Cable Specifications for MX5, MX10, MX40, and MX80 Routers on page 63
DC Power Circuit Breaker Requirements for the MX5, MX10, MX40, and MX80 Routers
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 13 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 13 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.
Related
Documentation
MX5, MX10, MX40, and MX80 Power System Description on page 35•
• Maintaining the MX5, MX10, MX40, and MX80 Power Supplies on page 161
• Replacing an MX5, MX10, MX40, and MX80 DC Power Supply on page 143
• MX5, MX10, MX40, and MX80 DC Power Electrical Safety Guidelines
• MX5, MX10, MX40, and MX80 Routers DC Power Specifications on page 59
• PowerConsumption for a DC-Powered MX5, MX10, MX40, and MX80 Router on page 60
• DC Power Source Cabling for MX5, MX10, MX40, and MX80 Routers on page 62
• DC Power Cable Specifications for MX5, MX10, MX40, and MX80 Routers on page 63
DC Power Source Cabling for MX5, MX10, MX40, and MX80 Routers
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.
CAUTION: 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
Copyright © 2017, Juniper Networks, Inc.62
MX5, MX10, MX40, and MX80 3D Universal Edge Router Hardware Guide
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