Link Pass Through Function - TRENDnet TFC-1000MGB User Manual

Link Pass Through Function

LLCF (Link Loss Carry Forward)
When a device connected to the converter and the
TP line loss the link, the converter's fiber will
disconnect the link of transmit, so that the other
ends will know that there is a linkage error on this
end. And when the Fiber line loss the link, the
converter's TP will disconnected, and the other
end will know that there is linkage problem exist.
There is a default LLCF setting on this converter.
The table below shows how LLCF function is working:
M e dia
Co nv er te r A
L IN K 2
Fibe r
T X R X C o ppe r
Cab le 5
Cab le 1
Cab le 2
L INK 1
R X T X
Gigabit Sw itc h
Link Status
Link 1
Disconnect
Cable 1 Off
Cable 2 Off
Cable 3 On
Cable 4 Off
Cable 5 Off
M e dia
Co nv erte r B
L INK 3
Fibe r
C o ppe r
TX R X
Cab le 4
Cab le 3
L INK 4
R X TX
Gigabit Sw itc h
Link 2 Link 3 Link 4
On On On
Off Off Off
On On Off
Off Off Off
Off Off Off
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LLR (Link Loss Return)
When a device connected to the converter and the
fiber line loss the link, the converter's fiber will
disconnect the link of transmit.
There is a switch to enable or disable the function
of the media converter.
The table below shows how LLR function is working:
Media Converter
A
B
Me dia
Co nve rte r A
LINK 2
Fibe r
C o ppe r TX R X
Cab le 1
Cab le 2
Cab le 3
LINK 3
C o ppe r
Gigabit Sw itc h
Link Status
Link 1
Disconnect
Cable 1
Off
Cable 2
Off
Cable 3
Off
Cable 4
Off
NOTE: If connecting two converters with LLR function in both end, it is
recommended that the monitor end converter had to turn off the LLR function, and
turn on the LLR function of the remote end
LLR Auto-Negotiation
ON OFF
OFF OFF
Me dia
Co nve rte r B
LINK 1
Fibe r
TX R X C o ppe r
Cab le 4
LINK 4
C o ppe r
Gigabit Switc h
Link 2 Link 3 Link 4
Off Off Off
On On Off
Off Off Off
Off Off Off
converter.
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