Juniper T640 Hardware Guide

CHAPTER 33
Troubleshooting Components
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Overview of Troubleshooting Resources for the T640 Router on page 463
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T640 LED Overview on page 464
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T640 Alarm Messages Overview on page 466
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Troubleshooting the T640 Craft Interface on page 467
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Troubleshooting the T640 SONET Clock Generators on page 468
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Troubleshooting the T640 Cooling System on page 469
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Troubleshooting the T640 Host Subsystem on page 472
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Troubleshooting the T640 Control Board on page 473
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Troubleshooting the T640 FPCs on page 474
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Troubleshooting the T640 PICs on page 475
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Troubleshooting the T640 Power System on page 476
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Troubleshooting the T640 SIBs on page 479
Overview of Troubleshooting Resources for the T640 Router
To troubleshoot a router, you use the Junos OS command-line interface (CLI), LCD,
alarms, devices connected to the alarm relay contacts on the CIP, and LEDs on both the
components and craft interface.
•
LEDs—When the Routing Engine detects an alarm condition, it lights the red or yellow
alarm LED on the craft interface as appropriate. In addition, you can also use the
component-specific LEDs on the craft interface and on the faceplate of a component
to troubleshoot the router.
•
LCD—When a red or yellow alarm occurs, the cause of the alarm messages is displayed
on the craft interface LCD.
•
Alarm devices connected to the alarm relay contact on the CIP—When a red or yellow
alarm occurs, it trips the corresponding alarm relay contact on the CIP.
•
CLI—The CLI is the primary tool for controlling and troubleshooting hardware, Junos
OS, routing protocols, and network connectivity. Use the CLI to display more information
about alarms. CLI commands display information from routing tables, information
specific to routing protocols, and information about network connectivity derived from
463Copyright © 2017, Juniper Networks, Inc.

Juniper T640 Specifications

General

Brand	Juniper
Model	T640
Category	Network Router
Language	English