Juniper E Series Hardware Manual page 119

For example, an OCx/STMx line module can pair with either an OC3-4 or an
OC12/STM4 I/O module. Consequently, the line module has four port status LEDs
for OC3/STM1 operation. However, only the top set of port status LEDs are active
during OC12/STM4 operation.
Table 12 shows the functions of the module and port status LEDs.
Table 12: LED identification and activity descriptions
LED Location LED Label
All modules OK
FAIL
ONLINE
All modules REDUNDANT
SRP module POWER A OK
POWER B OK
FAN OK
FAN FAIL
LINK
ACTIVITY
Ethernet line LINK
modules
ACTIVITY
HSSI line SYNC
module
YEL ALM
RED ALM
LED Indicator LED Color
Module status Green
Module status Red
Module status Green
Redundancy Green
Power Green
Power Green
Fan Green
Fan Red
When the LED alternates between OK and FAIL in ten second intervals, a
NOTE:
non-critical fan failure exists.
Ethernet Green
Ethernet Green
Ethernet Green
Ethernet Green
Port status Green
NOTE: This LED is not functional on the HSSI line module.
Port status Red
OFF to ON ON to OFF
Self-test passed Failure detected
Failure detected Diagnostic test running
Module online Module offine
See Redundancy Status later in this chapter.
NOTE: The REDUNDANT LED on the cOCx/STMx, FE-8,
GE/FE, HSSI, OCx/STMx, and X.21/V.35 line modules is
nonfunctional.
Power online on source A Power off
Power online on source B Power off
Fan online Critical fan failure
Critical fan failure Fan online
Ethernet link up Ethernet link down
Blinks when Ethernet traffic No Ethernet traffic on link
on link
Ethernet link up Ethernet link down
Blinks when Ethernet traffic No Ethernet traffic
on link
on link
If the port is configured as If the port is configured as
DTE, the LED lights when DTE, the LED goes out
both the DCE and the clock when either the DCE or the
source are available. clock source becomes
unavailable.
If the port is configured as
DCE, the LED lights when If the port is configured as
the DTE is available. DCE, the LED goes out
when the DTE becomes
unavailable.
If the port is configured as If the port is configured as
DTE, the LED lights when DTE, the LE goes out when
either the DCE or the clock both the DCE and the clock
source becomes source are available.
unavailable.
If the port is configured as
If the port is configured as DCE, the LED goes out
DCE, the LED lights when when the DTE is available.
the DTE becomes
unavailable.
Understanding Status LEDs to Troubleshoot
Chapter 10: Troubleshooting
! 101