Led Activity - Juniper E120 - RELEASE 11.1.X HARDWARE GUIDE 3-25-2010 Hardware Manual

Table 10: LED Identification and Activity Descriptions (continued)
LED Location LED Label
PB
FO
FF
LK
AC
IOAs
ALM
OK

LED Activity

When the system boots, it runs a series of tests for each module installed in the
system, and the LEDs display various configurations. See Table 11 on page 84 and
Table 12 on page 84 to understand normal and abnormal LED activity.
NOTE: When you reboot the system after installing a new version of the software,
the line modules appear to boot twice.
LED Indicator LED Color
Power B Green
Fan online Green
Fan failure Red
NOTE: You can run the show environment command to see whether a noncritical
fan failure exists.
Ethernet link Green
NOTE: In case of SRP hot-swap, when SRP IOA is removed, LK is turned off. When
an SRP IOA is inserted, LK is green and stable.
Ethernet activity Green
NOTE: In case of SRP hot-swap, when SRP IOA is removed, AC is turned off. When
an SRP IOA is inserted, AC is green and blinking.
NOTE: Not all IOAs have the following LEDs.
Port status Yellow
Port status Red
Port status
Chapter 9: Troubleshooting
OFF to ON
Power is online on
source B.
Fan is online.
Critical fan failure.
Ethernet link is up.
Blinks when
Ethernet traffic is
on link.
The remote end of
the link is
experiencing loss
of signal (FERF).
Port is
experiencing loss
of signal.
Physical link is
connected
properly and is
functioning
properly.
Understanding Status LEDs to Troubleshoot
ON to OFF
Power is off.
Critical fan failure.
Fan is online.
Ethernet link is
down.
No Ethernet traffic
is on link.
No FERF present,
port is working
correctly.
Port is working
correctly; in sync.
Physical link is not
connected
properly and is not
functioning
properly.
83