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 FPC card cage, 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 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 Test Button. For more information about the causes of alarms, see Chassis 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 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 Offline Button.
• Host module—Two sets 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, and a red one labeled OFFLINE. For more information, see Host Module LEDs.

LEDs on Hardware Components

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

• DC power supply—A green LED labeled CB ON, a blue one labeled OUTPUT OK, and an amber one labeled CB OFF. The original power supply also has an amber LED labeled NO AIRFLOW. For more information, see Power Supply.
• MCS—A blue LED labeled MASTER, a green one labeled OK, and an amber one labeled FAIL. For more information, see MCS Components.
• PCG—A blue LED labeled MASTER, a green one labeled OK, and an amber one labeled FAIL. For more information, see PCG Components.
• 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 M160 Internet Router PIC Guide.
• SFM—A green LED labeled OK and a red one labeled FAIL. For more information, see SFM Components.