LEDs

The LEDs described in the following sections indicate the basic status of hardware components.

LEDs on the Craft Interface

The craft interface provides status and troubleshooting information at a glance. It is located on the front of the chassis above the FPCs, as shown in Figure 1. The LEDs on the craft interface include the following:

• Alarm—The circular red alarm LED at the upper left of the craft interface indicates a critical condition that can result in a system shutdown. The triangular yellow alarm below it indicates a less severe condition that requires monitoring or maintenance. Both alarms can occur simultaneously. For more information about the alarm LEDs, see Alarm Relay Contacts, LEDs, and Cutoff Button. For more information about the causes of alarms, see Hardware and Interface Alarm Messages.
• FPC—For each of the FPC slots in the router, there are two LEDs and an offline button located on the craft interface. The green LED labeled OK and the amber LED labeled FAIL indicate FPC status. For more information, see FPC LEDs and Offline Button.
• Routing Engine—Two sets of LEDs in the middle of the craft interface near the Juniper Networks logo indicate the status of the two Routing Engines. Each set includes three LEDs—a blue one labeled MASTER, a green one labeled ONLINE, and an amber one labeled OFFLINE. The LEDs on the Routing Engine panel display the same information; see Routing Engine LEDs and Offline Buttons.

LEDs on Hardware Components

LEDs on the faceplates of the following hardware components report their status:

• PIC—Most PICs have an LED labeled STATUS on the PIC faceplate. Some PICs have additional LEDs, often one per port. The meaning of the LED states differs for various PICs. For more information, see the M20 PIC Guide.
• Power supply—A green LED labeled OK and an amber LED labeled FAULT report the status of the power supply. For more information, see Power Supply LEDs.
• Routing Engine panel—Sets of LEDs on the Routing Engine panel indicate the status of the two Routing Engines. Each set includes three LEDs—a blue one labeled MASTER, a green one labeled ONLINE, and an amber one labeled OFFLINE. For more information, see Routing Engine Panel and Fan Tray.
• SSB—An amber LED labeled OFFLINE, a green LED labeled ONLINE, and a blue LED labeled MASTER report the status of the SSB. For more information, see SSB Components.