Instruction Manual
6
Link fault pass-through (LFP)
Link fault pass-through can notify you of link problems and provides an efficient
solution for monitoring your network. The
LFP
DIP switch is set to OFF by default, and
you can use the DIP switch to enable
(ON)
or disable (OFF) the LFP function.
If you are familiar with your network infrastructure and proper diagnostic procedures,
you can leave the
LFP
DIP switch in the OFF position. Otherwise, it is recommended to
set the
LFP
DIP switch to the downward
ON
position.
Enable LFP
When the DIP switch is set to
ON
, LFP is enabled. When a device is connected to
the media converter, and the copper line or fiber line drops the link, then the media
converter will disconnect the transmission link on the opposite interface.
• Slide the
LFP
DIP switch (DIP switch 3) to the downward
ON
position to enable LFP.
Disable LFP
When the DIP switch is set to OFF, LFP is disabled (default).
• Slide the
LFP
DIP switch (DIP switch 3) to the upward OFF position to disable LFP.
Troubleshoot
Always check to ensure the duplex setting of the connected fiber equipment matches
the duplex setting of the media converter.
Troubleshoot the RJ45 copper UTP link
The RJ45 port supports Gigabit (1000Base-T) network devices and cables only. It does
not support 10/100Mbps copper (RJ45) network devices.
The ET91000SM20 is a transparent media converter (it is not a switch). Therefore,
the duplex setting of your fiber network equipment must match that of the media
converter’s RJ45 copper UTP port.
• For example, if your connected fiber device is full duplex, set the duplex DIP switch
(DIP switch 1) on the media converter to the upward OFF
(FULL)
position.
Note:
In most copper to fiber network infrastructures, your connected devices should
be set to full duplex. In most networks, a copper link won’t be established if you set DIP
switch 1 to the downward
ON
(half duplex) position.
Always check your fiber network equipment to ensure it hasn’t mistakenly been set to
half duplex.
