Microsens MS400080H - Manual (Page 7)

4. Link Fault Pass Through
The Converter model of LFP (link fault pass through) in TX/FX
converter application is controlled by the software and instantly take
effect.
Link status on one port is propagated to the other port to notice
the remote nodes. If TP port is unplugged, this converter stops
transmission on fiber port. This causes the remote fiber node link to
fail. LED shows the link failure on both TP and fiber ports. If fiber link
fails, this converter restarts auto-negotiation on TP port but always
stays in the link failure state. This causes the remote TP node link to
fail. LED also shows the link failure on both TP and fiber ports. Refer
to Fig. 9 shown below for the normal status when the link succeeds.
Also refer to Fig. 10 and Fig. 11 for the erroneous status when TP
Cable A, Fiber Cable B or Fiber Cable C fails to connect.
Note: Link fault pass through (LFP) function only takes effect as S1-
Bit2 (see Fig. 15) is enabled. Disabled S1-Bit2 will turn this
media converter into a general one.
Fig. 12 Normal status via LFP converter
Fig. 11 The status as Fiber Cable B or C is broken
Fig. 9 Normal status via LFP converter
Fig. 10 The status as TP Cable A or D is broken
LFP LFP
GbE
Switch
GbE
Switch
Remote
Station
A
Fiber
Cable
TP
B
C
D
TP
LFP LFP
GbE
Switch
GbE
Switch
Remote
Station
A
Fiber
Cable
TP
B
C
D
TP
LFP LFP
GbE
Switch
GbE
Switch
Remote
Station
A
Fiber
Cable
TP
B
C
D
TP
LFP
GbE Fiber
Switch
GbE
Switch
Remote
Station
A
Fiber
Cable
TP
B
C
LFP
GbE Fiber
Switch
GbE
Switch
Remote
Station
A
Fiber
Cable
TP
B
C