Two-Input 160-A Dc Power Supply Inputs; Tolerance; Figure 27: Two-Input 160-A Dc Power Supply; Table 16: Components Powered By Each Input - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
50

Figure 27: Two-Input 160-A DC Power Supply

Two-Input 160-A DC Power Supply Inputs

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 16 on page 50 describes which components are powered by each input.

Table 16: Components Powered by Each Input

Input Provides Power to These Components
FPCs in slots
INPUT 0 FPC0
fan trays
FPCs in slots
INPUT 1 FPC2
Two-Input 160-A DC Power Supply Load Sharing and Fault Tolerance
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. Table 17 on page 51 describes
the behavior of the two-input 160-A DC power supply and router if one of the inputs fails.
and , SIBs, T-CBs, Routing Engines, CIP, craft interface, and
FPC1
through
FPC7
Copyright © 2010, Juniper Networks, Inc.
INPUT 1 and INPUT 0 , from top
PEM0
must be powered by
PEM1
must