M120 Control Board (Cb) Leds; M120 Craft Interface Overview; M120 Craft Interface Description; Table 7: M120 Control Board Leds - Juniper Networks Hardware Manual

M120 Control Board (CB) LEDs

Related
Documentation

M120 Craft Interface Overview

M120 Craft Interface Description

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Replacing an M120 CB on page 143
Table 7 on page 23 describes the functions of the Control Board LEDs.

Table 7: M120 Control Board LEDs

Label Color
Green
OK
Yellow
FAIL
Blue
MSTR
M120 Control Board (CB) Description on page 21
Maintaining the M120 Host Subsystem on page 104
Replacing an M120 CB on page 143
M120 Craft Interface Description on page 23
Alarm LEDs and Alarm Cutoff/Lamp Test Button on the M120 Craft Interface on page 24
Routing Engine Interface Ports and Status Indicators on the M120 Craft
Interface on page 25
External Clock Interface Ports on the M120 Craft Interface on page 25
Host Subsystem LEDs on the M120 Craft Interface on page 26
FEB LEDs on the M120 Craft Interface on page 27
FPC LEDs on the M120 Craft Interface on page 27
Power Supply LEDs on the M120 Craft Interface on page 28
Alarm Relay Contacts on the M120 Craft Interface on page 28
The craft interface allows you to view status and troubleshooting information at a glance
and to perform many system control functions. It is hot-insertable and hot-removable.
The craft interface is located on the front of the router above the upper fan tray and
contains the following:
State Description
On steadily Control board is functioning normally.
On steadily Control board has failed.
On steadily Control board is master.
Chapter 2: M120 Hardware Components
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