Juniper T640 Hardware Guide

Table 53: Fault Tolerance
Fault Tolerance When One Input Fails or Is DisconnectedRedundancy
If either input fails, the router shuts down.
NOTE: We recommend that you install redundant power supplies.
Nonredundant 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.
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 Two-Input 160-A DC Power Supply LEDs
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 54 on page 98 describes the functions of the power supply LEDs.
Table 54: Two-Input 160-A DC Power Supply LEDs
DescriptionStateColorLED
Circuit breaker is on.On steadilyGreenCB OK
Circuit breaker is off.Off
Circuit breaker is not turned on, or host subsystem
has detected a failure and has turned the circuit
breaker off.
On steadilyYellowCB TRIP
No problems have occured with circuit breaker, or
the power supply is off.
Off
Power supply has exceeded recommended
temperature.
On steadilyYellowOVER TEMP
Power supply is within the recommended
temperature or is not turned on.
Off
Power supply is installed correctly and is
functioning normally.
On steadilyBlueDC OK
Power supply is starting up, is not properly
installed, or is not functioning correctly. One of the
inputs might have failed, or the power supply might
not be receiving sufficient power.
Blinking
Power supply is not powered on.Off
Copyright © 2017, Juniper Networks, Inc.98
T640 Core Router Hardware Guide

Juniper T640 Specifications

General

Brand	Juniper
Model	T640
Category	Network Router
Language	English