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5-6
C
HAPTER
5: P
OWER
-O
N
E3/DS-3 Status LEDs The E3/DS-3 status LEDs are found on the front panel of the E3/DS-3
piggy (Figure 5-3). Table 5-5 lists the LEDs of the E3/DS-3 piggy.
Figure 5-3
E3/DS-3 Status LEDs
Table 5-5
E3/DS-3 Status LEDs
LED Color Description
LOS
Loss of Signal
Green
On:
There is a signal on Rx (normal state).
Off:
No signal on Rx (problem with Rx).
FERF
Far End Rx Failure
Signal
Yellow
On:
FERF in incoming frames (the peer reports
about its Rx problem).
Off:
No FERF in incoming frame.
AIS
Alarm Indication
Signal
Blue
On:
AIS signal is present for at least 5 sec. (the
peer reports about its problem).
Off:
No AIS signal present for at least 5 sec.
(normal state).
LOF
Loss of Frame
Red
On:
LOF is present for at least 5 sec. (problems
with Rx).
Off:
No LOF for at least 15 sec.