Two-Input 160-A Dc Power Supply Inputs; Two-Input 160-A Dc Power Supply Load Sharing And Fault Tolerance; Figure 36: Two-Input 160-A Dc Power Supply; Table 52: Components Powered By Each Input - Juniper T640 Hardware Manual

Two-Input 160-A DC Power Supply Inputs

Two-Input 160-A DC Power Supply Load Sharing and Fault Tolerance

Copyright © 2017, Juniper Networks, Inc.

Figure 36: Two-Input 160-A DC Power Supply

Each two-input 160-A DC power supply has two inputs—
to bottom—each with its own 80-A (@ –48 VDC) circuit breaker.
NOTE: All inputs on the two-input 160-A DC power supply in slot
be powered by dedicated power feeds derived from feed A, and all inputs on
the two-input 160-A DC power supply in slot
dedicated power feeds derived from feed B. This configuration provides the
commonly deployed A/B feed redundancy for the system.
Table 52 on page 97 describes which components are powered by each input.

Table 52: Components Powered by Each Input

Input Provides Power to These Components
INPUT 0 FPCs in slots FPC0
and fan trays
FPCs in slots
INPUT 1 FPC2
When the router is operating normally and both power supplies in a redundant power
system 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 with both inputs active can
provide full power for as long as the router is operational.
the behavior of the two-input 160-A DC power supply and router if one of the inputs fails.
Chapter 7: Power System Components and Descriptions
and FPC1 , SIBs, control boards, Routing Engines, CIP, craft interface,
through
FPC7
and , from top
INPUT 1 INPUT 0
PEM0
must be powered by
PEM1
Table 53 on page 98 describes
must
97