3com DUA3700-0BAA04 Manual De Usuario
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.
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
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
Far End Rx Failure
Signal
Yellow
On: FERF in incoming frames (the peer reports
about its Rx problem).
about its Rx problem).
Off: No FERF in incoming frame.
AIS
Alarm Indication
Signal
Alarm Indication
Signal
Blue
On: AIS signal is present for at least 5 sec. (the
peer reports about its problem).
peer reports about its problem).
Off: No AIS signal present for at least 5 sec.
(normal state).
(normal state).
LOF
Loss of Frame
Loss of Frame
Red
On: LOF is present for at least 5 sec. (problems
with Rx).
with Rx).
Off: No LOF for at least 15 sec.