Related
Documentation
M120 Craft Interface Description on page 11•
• M120 Routing Engine Interface Ports and Status Indicators on page 28
• M120 External Clock Interface Ports on the Craft Interface on page 16
• Replacing the M120 Craft Interface on page 184
M120 Component LEDs on the Craft Interface
•
Host Subsystem LEDs on the M120 Craft Interface on page 14
•
Ethernet Port LEDs on the Craft Interface on page 14
•
FEB LEDs on the M120 Craft Interface on page 15
•
FPC LEDs on the M120 Craft Interface on page 15
•
Power Supply LEDs on the M120 Craft Interface on page 15
•
External Clocking Inputs LEDs on the M120 Craft Interface on page 15
Host Subsystem LEDs on the M120 Craft Interface
Each host subsystem has three LEDs, located in the middle of the craft interface, that
indicate its status. The LED labeled 0 indicates the status of the Routing Engine and CB
installed in slot CB0. The LED labeled 1 indicates the status of the Routing Engine and
CB installed in slot CB1. Table 4 on page 14 describes the functions of the host subsystem
LEDs.
Table 4: M120 Host Subsystem LEDs
DescriptionStateColorLabel
Routing Engine is the master.On steadilyGreenRE MASTER
The Routing Engine is functioning.On steadilyGreenRE STATUS
The Routing Engine has failed.On steadilyRed
The board is online.On steadilyGreenCB STATUS
The board is transitioning online/offline.Blinking
The CB has failed.On steadilyRed
Ethernet Port LEDs on the Craft Interface
Two small LEDs on the bottom of the ETHERNET port indicate the connection in use: the
LED lights yellow or green for a 10-Mbps or 100-Mbps connection, and the LED lights
green when traffic is passing through the port. Related Documentation M Series RJ-45
Connector Pinouts for the M120 Routing Engine ETHERNET Port RJ-45 Connector Pinouts
for the Routing Engine AUX and CONSOLE Ports RJ-45 Connector Pinouts for the External
Clock Ports
Copyright © 2018, Juniper Networks, Inc.14
M120 Multiservice Edge Router Hardware Guide
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