Figure 41: Six-Input DC Power Supply
Inputs
The six-input DC power supply inputs are labeled INPUT 0, INPUT 1, INPUT 2, INPUT 3,
INPUT 4, and INPUT 5, from top to bottom. Each 60 A input consists of –48 VDC and
return.
Table 60 on page 105 describes which components are powered by each input.
Table60: Components Powered by Each Six-Input DC Power Supply Input
ComponentsInput
Fan traysINPUT 0
FPCs, Routing Engines, control boards, SIBs, craft interface, SCGs,
and other components in the router.
INPUT 1 through INPUT 5
Redundancy
When the router is operating normally and both power supplies are switched on, load
sharing between them occurs automatically. When one power supply fails or is turned
off, the other power supply immediately assumes the entire electrical load for the system.
A single power supply can provide full power for as long as the router is operational.
Related
Documentation
T640 Six-Input DC Power Supply LEDs on page 105•
• Troubleshooting the T640 Power System on page 476
• Replacing a T640 Six-Input DC Power Supply on page 380
• T640 DC Power Supply Electrical Specifications on page 126
T640 Six-Input DC Power Supply LEDs
LEDs on each six-input DC power supply faceplate indicate the status of the power
supply. In addition, a power supply failure triggers the red alarm LED on the craft interface.
Table 61 on page 106 displays the power supply LEDs.
105Copyright © 2017, Juniper Networks, Inc.
Chapter 7: Power System Components and Descriptions
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