Three-Input 240-A Dc Power Supply Inputs; Tolerance; Figure 35: Three-Input 240-A Dc Power Supply; Table 28: Components Powered By Each Three-Input 240-A Dc Power Supply - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
64

Figure 35: Three-Input 240-A DC Power Supply

Three-Input 240-A DC Power Supply Inputs

The three-input 240-A DC power supply inputs are labeled
from top to bottom. Each input consists of –48 VDC and return, each with its own 80-A
circuit breaker. The input mode switch on the faceplate allows you to set the DC power
supply to either or
2–INPUT
and TX Matrix router.
Table 28 on page 64 describes which components are powered by each input.
Table 28: Components Powered by Each Three-Input 240-A DC Power
Supply Input
Input Three-Input Mode
INPUT 0 T640-SIBs, control boards, fan trays,
Routing Engines, and FPCs in slots
and FPC1
INPUT 1 FPCs in slots FPC2
INPUT 2 This input is not supported in
mode.
Three-Input 240-A DC Power Supply Load Sharing and Fault Tolerance
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.
Table 29 on page 65 describes the behavior of the power supply if one of the inputs fails.
mode. mode is required for the T640 router
3–INPUT 2-INPUT
FPC0
through FPC7
2–INPUT
, , and
INPUT 0 INPUT 1 INPUT 2
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