T640 Four-Input 240-A DC Power Supply Description
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Four-Input 240-A DC Power Supply on page 102
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Four-Input 240-A DC Power Supply Inputs on page 102
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Four-Input 240-A DC Power Supply Load Sharing and Fault Tolerance on page 103
Four-Input 240-A DC Power Supply
Each four-input 240-A DC power supply weighs approximately 26.6 lb (12.0 kg) and
consists of four inputs, four 60-A circuit breakers, a fan, and LEDs to monitor the status
of the power supply. Figure 39 on page 102 shows the four-input 240-A DC power supply.
Figure 39: Four-Input 240-A DC Power Supply
g004659
LEDs
Circuit breakers
Four-Input 240-A DC Power Supply Inputs
The four-input 240-A DC power supply inputs are labeled INPUT 0, INPUT 1, and INPUT 2,
and INPUT 3 from top to bottom. Each input consists of –48 VDC and return, each with
its own 60-A circuit breaker.
Table 58 on page 102 describes which components are powered by each input.
Table 58: Components Powered by Each Four-Input 240-A DC Power
Supply Input
ComponentsInput
SIBs, control boards, Routing Engines, and half the system fan powerINPUT 0
FPCs in slots FPC0 and FPC1 and half the system fan powerINPUT 1
FPCs in slots FPC2 through FPC4INPUT 2
FPCs in slots FPC5 through FPC7INPUT 3
Copyright © 2017, Juniper Networks, Inc.102
T640 Core Router Hardware Guide
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