Two bi-color LEDs in the lower left and right corners of each port indicate port status.
The LED on the lower left as you face the craft interface indicates whether an external
clock source is present. The LED on the lower right as you face the craft interface indicates
if there is a fault. Table 9 on page 26 describes the external clock port LEDs,
Table 9: External Clock LEDs on the M120 Craft Interface
Description
State
Color
Label
External clock source is plugged into the port,
physical signal is present.
On steadily
Green
A
No external clock source is plugged into the port, no
physical signal is present.
Off
–
Fault condition; external reference clock frequency
is out of the tolerance threshold deviation of 10
parts-per-million (PPM).
On steadily
Yellow
B
(Fault LED)
External clock signal is validated or no external clock
source is plugged into the port.
Off
–
Related
Documentation
RJ-45 Connector Pinouts for the M120 Routing Engine ETHERNET Port on page 247
•
•
RJ-45 Connector Pinouts for the Routing Engine AUX and CONSOLE Ports on page 248
•
RJ-45 Connector Pinouts for the External Clock Ports on page 248
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 10 on page 26 describes the functions of the host subsystem
LEDs.
Table 10: M120 Host Subsystem LEDs
Description
State
Color
Label
Routing Engine is the master.
On steadily
Green
RE MASTER
The Routing Engine is functioning.
On steadily
Green
RE STATUS
The Routing Engine has failed.
On steadily
Red
The board is online.
On steadily
Green
CB STATUS
The board is transitioning online/offline.
Blinking
The CB has failed.
On steadily
Red
Copyright © 2010, Juniper Networks, Inc.
26
M120 Multiservice Edge Router Hardware Guide
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