LevelOne FVT-0103TXFC - Manual (Page 6)

5. Link Fault Pass Through
This PoE converter supports link fault pass through (LFP) in
TX/FX converter application. 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. 7 shown below for the normal
status when the link succeeds. Also refer to Fig. 8 and Fig. 9
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-Bit4 (see Fig. 11) is enabled. Disabled S1-Bit4 will turn
this media converter into a general one.
Fig. 1 The View of FVT-0103TXFC PoE Converter
100FX Fiber
Network
Fiber Optic
PSE Ethernet
Switch(Refer to
Fig. 6)
Cat. 5 Cable RJ-45 Jack
Fig. 2 Connection among PSE Ethernet Switch, Fiber
and TP Cables
100FX
Fiber
Network
RX
TX
TX
RX
PoE TP-to-FX
Converter
PoE PSE or
PoE Injector
Fig. 3 Power from PSE or PoE Injector
6 3