Troubleshooting Components; Overview Of Troubleshooting Resources For The T640 Router; Chapter 33 Troubleshooting Components - Juniper T640 Hardware Manual

CHAPTER 33

Troubleshooting Components

Overview of Troubleshooting Resources for the T640 Router

Copyright © 2017, Juniper Networks, Inc.
Overview of Troubleshooting Resources for the T640 Router on page 463
T640 LED Overview on page 464
T640 Alarm Messages Overview on page 466
Troubleshooting the T640 Craft Interface on page 467
Troubleshooting the T640 SONET Clock Generators on page 468
Troubleshooting the T640 Cooling System on page 469
Troubleshooting the T640 Host Subsystem on page 472
Troubleshooting the T640 Control Board on page 473
Troubleshooting the T640 FPCs on page 474
Troubleshooting the T640 PICs on page 475
Troubleshooting the T640 Power System on page 476
Troubleshooting the T640 SIBs on page 479
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
463