M160 Internet Router Hardware Guide
console, and the port labeled ETHERNET attaches to a management LAN. Formore
information, see “Routing EngineManagement Ports” on page 33.
For information about using the CLI to displaydetails about alarms
generated by interfaces and hardware components, see “Chassis and
Interface Alarm Messages” on page 209.
For informationabout using the CLI to troubleshoot the JUNOS Internet software,
see the appropriate JUNOS Internetsoftware configuration guide.
LEDs
The LEDs described in the following sections i ndicate the basic
status of hardware components.
LEDs on the Craft Interface
The craft interface providesstatus and troubleshooting information at a glance.
It is located on the frontof the chassis above the FPC card cage, as shownin
Figure 1. Th e LEDs on the craft interface include the following:
Alarm—The circular redalarm LED at the upper left of the craft interface
indicates a critical conditionthat can result in a system shutdown. The
triangular yellowalarm next to it indicates a less severe condition that requires
monitoring or maintenance. Both alarms can occur simultaneously. When
an alarm LED is lit, the LCD describes the cause of the alarm. For more
information about the alarm LEDs,see “Alarm LEDs and Alarm Cutoff/Lamp
TestButton” on page 28. For more informationabout the causes of alarms,
see “Chassis and InterfaceA larmMessages” on page 209.
FPC—For each of the FPC slots in therouter, there are two LEDs and an
offline button located on the craft interface directly above the slot. The green
LED labeled OK and the red LED labeled FAIL indicate FPC status. For more
information, see “FPC LEDs and OfflineButton” on page 31.
Host module—Twosets of LEDs at the upper right corner of the craft interface
indicate the status of the two host modules. Each set includes three LEDs—a
green one labeled MASTER, another green one labeled ONLINE,andaredone
labeled OFFLINE. For more information,see “Host Module LEDs” on page 31.
208 Overview of Troubleshooting Resources