GE D90 Plus Instruction Manual page 73

CHAPTER 3: INSTALLATION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 32: 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
IEEE Loss of Signal detected,
C37.94 signal but not receiving
valid data
Direct Loss of Signal detected,
fiber signal but not receiving
valid data
G.703 Loss of Signal detected,
signal but not receiving
valid data
RS422 Loss of Clock detected,
clock but not receiving
valid data
ELECTRICAL INSTALLATION
Green, blinking Yellow, blinking
Signal detected Signal detected, receiving valid
and receiving valid data and the received yellow bit
data; yellow bit alarm is set; the yellow bit indicates
alarm not set that remote unit is not receiving
valid data
Signal detected Not used
and receiving valid
data
Signal detected Not used
and receiving valid
data
Clock detected Not used
and receiving valid
data
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