Installation Manual

INS_FDX70E_REV–
03/01/12
PAGE 5
FAULT CONDITIONS
TECH SUPPORT: 1.888.678.9427
INSTALLATION AND OPERATION MANUAL FDX70E(A,B)(M,S)1
A fault condition is when a FDX70E unit system loses power or optical link. The FDX70E provides three LED indicators to help
identify when and where fault conditions occur in a system:
1. ALARM relay output
2. STATUS LED
3. LINK A and LINK B LEDs
When a fault occurs, the ALARM relay on every FDX70E in the system goes from closed to open. In addition, the STATUS LED
on every FDX70E in the system goes from solid green to solid red. The LINK A and LINK B LEDs can then be used to identify the
actual location of the fault based on their color and pattern:
Solid Green Optical link has been established between this optical port and the adjacent FDX70E over fiber.
Furthermore, every other unit in the system is also reporting that link has been established. There are no faults in
the system.
Solid Red Optical link over this port has been lost.
This could be due to a broken fiber, a bad connection, or loss of power at the adjacent unit.
Optical Fiber Optical Fiber
Optical Fiber
Optical Fiber
FDX70EAS1
Unit 1
D
FDX72S1
Unit 3
FDX70EBS1
Unit 2
D
D
FDX72S1
Unit 2
FDX70EAS1
Unit 1
D
D
FDX70EBS1
Unit 4
D
DIN/DOUT DIN/DOUT
DIN/DOUT
DIN/DOUT
DIN/DOUT
DIN/DOUT
A
B
A
A
B
B
A
B
FIGURE 8 – TYPICAL APPLICATIONS
Linear Drop-Insert-Repeat Chain using compatible FDX72 units
Point-to-Point