Chapter 2: Hardware Components

Table 11: Alarm LEDs and Alarm Cutoff/Lamp Test Button

Shape

Color

State

Description

 

 

Red

On steadily

Critical alarm LED—Indicates a critical condition

 

 

 

 

that can cause the router to stop functioning.

 

 

 

 

Possible causes include component removal, failure,

 

 

 

 

or overheating.

 

 

Yellow

On steadily

Warning alarm LED—Indicates a serious but nonfatal

 

 

 

 

error condition, such as a maintenance alert or a

 

 

 

 

 

 

 

 

significant increase in component temperature.

 

 

Alarm cutoff/lamp test button—Deactivates red and

 

 

 

 

yellow alarms. Causes all LEDs on the craft interface

 

 

 

 

to light (for testing) when pressed and held.

Host Subsystem LEDs

Each host subsystem has three LEDs, located on the upper left of the craft interface, that indicate its status. The LEDs labeled RE0 show the status of the Routing Engine in slot 0 and the SCB in slot 0. The LEDs labeled RE1 show the status of the Routing Engine and SCB in slot 1/0Table 12 on page 19 describes the functions of the host subsystem LEDs.

Table 12: Host Subsystem LEDs

Label

Color

State

Description

MASTER

Green

On steadily

Host is functioning as the master.

ONLINE

Green

On steadily

Host is online and is functioning normally.

OFFLINE

Red

On steadily

Host is installed but the Routing Engine is offline.

 

 

Off

Host is not installed.

Power Supply LEDs

Each power supply has two LEDs on the craft interface that indicate its status. The LEDs, labeled 0 through 3, are located on the upper left of the craft interface next to the PEM label. Table 13 on page 19 describes the functions of the power supply LEDs on the craft interface.

Table 13: Power Supply LEDs on the Craft Interface

Label

Color

State

Description

PEM

Green

On steadily

Power supply is functioning normally.

 

Red

On steadily

Power supply has failed or power input has failed.

Craft Interface 19

Page 47
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Juniper Networks MX240 manual Host Subsystem LEDs, Power Supply LEDs, Alarm LEDs and Alarm Cutoff/Lamp Test Button