DCI LLC 10/100Base-TX to 100Base-FX PoE PSE FE Media Converter Benutzerhandbuch - Seite 11

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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: Link fault pass through (LFP) function only takes effect as S1-Bit4 (see Fig.
12) is enabled. Disabled S1-Bit4 will turn this media converter into a general
one.
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Switch
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Fig. 9 Normal status via a pair of LFPs
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Fig. 10 The status as TP Cable A is broken
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Fig. 11 The status as Fiber Cable B or C is broken

6. Link Fault Pass Through

B
LFP
C
TP
● ●
● ●
Fiber
Cable
B
LFP
C
TP
○ ○
● ○
Fiber
Cable
B
LFP
TP
C
○ ○
Fiber
Cable
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A
LFP
TP
●
10/100
Switch
A
LFP
TP
○
10/100
Switch
A
LFP
TP
○ ○
○
6
Remote
Station
●
Remote
Station
●
Remote
Station
●