Tolerance; T640 Two-Input 160-A Dc Power Supply Leds; Table 26: Fault Tolerance; Table 27: Two-Input 160-A Dc Power Supply Leds - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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T640 Two-Input 160-A DC Power Supply LEDs

Table 27: Two-Input 160-A DC Power Supply LEDs

LED Color
CB OK Green
Yellow
CB TRIP
62
Table 25: Components Powered by Each Input (continued)
Input Provides Power to These Components
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.
the behavior of the two-input 160-A DC power supply and router if one of the inputs fails.

Table 26: Fault Tolerance

Redundancy
Nonredundant power
supplies
Redundant power supplies
T640 Power System Description on page 60
Powering On a DC-Powered T640 Router on page 162
Maintaining the T640 Power Supplies on page 194
Four LEDs on each two-input 160-A DC power supply faceplate indicate the status of
the power supply. In addition, a power supply failure triggers the red alarm LED on the
craft interface. Table 27 on page 62
State
On steadily
Off
On steadily
Off
through
FPC7
Fault Tolerance When One Input Fails or Is Disconnected
If either input fails, the router shuts down.
NOTE: We recommend that you install redundant power supplies.
If either input on one power supply fails, the other power supply
assumes the electrical load for both inputs. If one of the inputs on
the other power supply is not functional, the router shuts down.
describes the functions of the power supply LEDs.
Description
Circuit breaker is on.
Circuit breaker is off.
Circuit breaker is not turned on, or host subsystem
has detected a failure and has turned the circuit
breaker off.
No problems have occured with circuit breaker, or
the power supply is off.
Table 26 on page 62 describes
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