10
1.877.877.2269
BLACKBOX.COM
NEED HELP?
LEAVE THE TECH TO US
LIVE 24/7
TECHNICAL
SUPPORT
1.877.877.2269
CHAPTER 5: LINK FAULT PASSTHROUGH
5. LINK FAULT PASSTHROUGH
The LFP (link fault passthrough) in a TX/FX converter application is controlled by the software and instantly takes effect. Link status on
one port is propagated to the other port to notice the remote nodes. If the TP port is unplugged, this converter stops transmission on the
fiber port. This causes the remote fiber node link to fail. An LED shows the link failure on both TP and fiber ports. If the fiber link fails, this
converter restarts auto-negotiation on the TP port but always stays in the link failure state. This causes the remote TP node link to fail.
An LED also shows the link failure on both TP and fiber ports. Refer to Figure 5-1 shown below for the normal status when the link
succeeds.
Also refer to Figure 5-2 and Figure 5-3 for the error 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 Figure 5-4) is enabled. Disabled S1-Bit2 will turn this media
converter into a general one.
Fiber
Cable
GbE
Switch
GbE
Switch
LFP
LFP
Remote
Station
D
A
B
C
TP
TP
FIGURE 5-1. NORMAL STATUS VIA LFP CONVERTER
Fiber
Cable
GbE
Switch
GbE
Switch
LFP
LFP
Remote
Station
D
A
B
C
TP
TP
FIGURE 5-2. THE STATUS AS TP CABLE A OR D IS BROKEN
Fiber
Cable
GbE
Switch
GbE
Switch
LFP
LFP
Remote
Station
D
A
B
C
TP
TP
FIGURE 5-3. THE STATUS AS FIBER CABLE B OR C IS BROKEN
Fiber
Cable
GbE
Switch
GbE Fiber
Switch
LFP
Remote
Station
A
B
C
TP
FIGURE 5-4. NORMAL STATUS VIA LFP CONVERTER
