Alloy GCR2000xx Benutzerhandbuch - Seite 6

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6. Link Fault Pass Through

LFP is a function used to diagnose link fault issues between your copper and fibre devices.
Two methods are supported, FEF (Far End Fault) and Forced Mode. FEF is used when both
devices support this feature, such as two GCR2000's. If the copper port on one of the media
converter loses link, a FEF packet is sent to the device at the other end of the fibre. This
device then shuts down the link on the copper and fibre ports of the media converter. If the
connecting fibre device does not support FEF it will not know what the FEF fault packet is
and keep the link active.
Forced mode is used when the second fibre device being used doesn't support FEF, such as a
fibre switch. If the copper port on the media converter loses link the media converter will
automatically shut down the fibre port on the media converter, this in turn brings down the
fibre link on the connecting switch.
GbE
Switch
D
LFP
TP
Fig. 3 Normal status via LFP converter
GbE
Switch
D
LFP
TP
Fig. 4 The status as TP Cable A or D is broken
GbE
Switch
D
LFP
TP
Fig. 5 The status as Fibre Cable B or C is broken
GbE Fibre
Switch
Fig. 6 Normal status via LFP converter
GbE Fibre
Switch
Fig. 7 The status as TP Cable A is broken
Alloy Computer Products Pty Ltd Copyright ©2010
Switch
B
A
LFP
C
TP
Fibre
Cable
Switch
B
A
LFP
C
TP
Fibre
Cable
Switch
B
A
LFP
C
TP
Fibre
Cable
Switch
B
A
LFP
C
TP
Fibre
Cable
Switch
B
A
LFP
C
TP
Fibre
Cable
GCR2000xx User Manual
GbE
Remote
Station
GbE
Remote
Station
GbE
Remote
Station
GbE
Remote
Station
GbE
Remote
Station