6
This media 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. 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
:
●
indicates LNK/ACT LED Lit
○
indicates LNK/ACT LED Off
Warning:
The LFP (Link Fault Pass Through) function works only when both two converters own this
capability in pairs. Furthermore, both LFP converters should be supplied only by the same
manufacturer/vender. The connection coming from LFP converters with odd models or non-
LFP converters will cease the LFP function.
○
○
○
○
○
○
●
C
B
10/100
Switch
10/100
Switch
Fiber
Cable
A
TP
TP
LFP
LFP
Fiber
Cable
B
A
○
○
○
○
●
C
○
○
TP
TP
10/100
Switch
Remote
Station
10/100
Switch
LFP
LFP
Fig. 9 Normal status via a pair of LFPs
A
B
10/100
Switch
LFP
●
LFP
10/100
Switch
TP
●
●
TP
Fiber
Cable
C
●
●
Remote
Station
●
●
Fig. 10 The status as TP Cable A is broken
Remote
Station
Fig. 11 The status as Fiber Cable B or C is broken
