Link Pass Through Function
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.
The switch 5 is to enable or disable the LLR function of the
media converter.
TX RX
Switc h B
Switc h A
Ca b le 3
Ca b le 2
Ca b le 4
Ca b le 1
Me d ia
Co n ve rte r B
Me d ia
Co nve rte r A
TX RX
LLCF Off
LLR Off
LLCF Off
LLR On
LINK 6
Copper
LINK 5
Copper
Copper
LINK 4
LINK FAIL 4
Fiber
LINK 3
LINK FAIL 3
Fiber
LINK 1
LINK FAIL 1 Copper
LINK 2
LINK FAIL 2
The table below shows the status happens when LLR function
is working through two ways of connection
Link
Status
Disconnect
Link
1
Link
2
Link
3
Link
4
Link
5
Link
6
Link
Fail 1
LED
Link
Fail 2
LED
Link
Fail 3
LED
Link
Fail 4
LED
Cable
1
On On Off On On On Off
Off
On
Off
Cable
2
Off On Off On On On On
Off
On
Off
Cable
3
On On On Off On Off Off
Off
Off
On
Cable
4
On Off On On Off On Off
On
Off
Off
Fib e r
C o p p e r
TX
RX
Fib e r
C o p p e r
Switc h C
Switc h D
LINK 8
LINK 3
LINK 1
LINK 7
Ca b le 3
Ca b le 2
Ca b le 4
Ca b le 1
Me d ia
Co nverte r B
Me d ia
Co nverte r A
LINK 2
LINK 4
LINK FAIL 4
LINK FAIL 3
LINK FAIL 1
LINK FAIL 2
LLCF Off
LLR Off
LLCF Off
LLR On
Fib e r
TX RX
Fib e r
LINK 6
LINK 5
Switc h A
Switc h B
TX
RX
TX RX
Ca b le 6
Ca b le 5
C o p p e r
C o p p e r
8
