Table 55: Components Powered by Each Three-Input 240-A DC Power
Supply Input
Three-Input ModeInput
T640-SIBs, control boards, fan trays,
Routing Engines, and FPCs in slots FPC0
and FPC1
INPUT 0
FPCs in slots FPC2 through FPC7INPUT 1
This input is not supported in 2–INPUT
mode.
INPUT 2
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 56 on page 100 describes the behavior of the power supply if one of the inputs fails.
Table 56: Fault Tolerance
Fault Tolerance When One Input Fails or is DisconnectedRedundancy
If this input fails, the router shuts down.
NOTE: We recommend that you install redundant power
supplies.
Nonredundant power supply
If an input on one power supply fails, the other power supply
assumes the electrical load for all inputs. If one input on the other
power supply is not functional, the router shuts down.
Redundant power supplies
Related
Documentation
T640 Power System Description on page 95•
• Powering On a DC-Powered T640 Router on page 239
• Maintaining the T640 Power Supplies on page 456
T640 Three-Input 240-A DC Power Supply LEDs
LEDs on each power supply faceplate (see Figure 38 on page 101) indicate the status of
the power supply. In addition, a power supply failure triggers the red alarm LED on the
craft interface. Table 57 on page 101 describes the functions of the power supply LEDs.
Copyright © 2017, Juniper Networks, Inc.100
T640 Core Router Hardware Guide
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