10/100/Gigabit High Power PoE to 1000BASE-SX Media Converter
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Page 5
DIP switch
DIP Switch and Reset button
Before you make any changes to DIP switch settings, make sure that the power has been turned off. Or press the reset
button after you change DIP switch 1 or 2 setting.
Switch
Function
DIP 1
Cut-Through Mode (default) or Normal Mode
DIP 2
LFP Enable (default) or Disable
DIP 3
PoE Enable (default) or Disable
Cut-Through mode supports jumbo frames up to 9216 Bytes.
5. LFP and FEF function
The LFP (Link Fault Pass-through) allows the media converter to monitor both the fiber and copper RX ports for loss of
signal. In case of a loss of RX signal on one media port, the converter will automatically disable the TX signal to the other
media port, thus passing through the link fault. FEF (Far End Fault) enables the converter to stop sending link pulses to
the link partner once a loss of the fiber RX signal is encountered. Then the link partner will synchronously stop sending
data. FEF prevents loss of valuable data transmitted over an invalid link. Using LFP and FEF troubleshooting features of
LPS530A-MM, both end devices can be notified of a loss of fiber link.
When link fault pass through function is enabled, link status on TX port will inform the FX port of the same device and vice
versa. From the link fault pass through procedure illustrated in the figure on the next page, if link fail happens on TX port
(1), the local FX port sends a non-idle pattern to the remote FX port (2). The remote FX port then forces its TX port to link
failed after receiving the non-idle pattern (4). In other words, this mechanism will alert the link fault status of the local TX
port to the remote converter’s TX port, and the link status of the remote TX port will become off. Link status LED will also
be off for both LPS530A-MM and its link partner.