62
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
ELECTRICAL INSTALLATION
CHAPTER 3: INSTALLATION
Figure 31: Link LEDs for fiber, RS422, and G.703 modules
The following table describes the operation of the link LEDs.
Table 4: Link LED operation
Protocol LED indications
Red, solid
Green, solid
Green, blinking
Yellow, blinking
IEEE
C37.94
Loss of
signal
Signal detected,
but not receiving
valid data
Signal detected
and receiving valid
data; yellow bit
alarm not set
Signal detected, receiving valid
data and the received yellow bit
alarm is set; the yellow bit indicates
that remote unit is not receiving
valid data
Direct
fiber
Loss of
signal
Signal detected,
but not receiving
valid data
Signal detected
and receiving valid
data
Not used
G.703
Loss of
signal
Signal detected,
but not receiving
valid data
Signal detected
and receiving valid
data
Not used
RS422
Loss of
clock
Clock detected,
but not receiving
valid data
Clock detected
and receiving valid
data
Not used
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