... open Fiber slots for SFP Transceiver- Built-in Link Loss Forwarding Technology- Easy Installation, Easy Troubleshooting- Long-haul Gigabit EthernetSpecifications:Standard ... mode·DIP Switch 2: TX to Fiber LLF(Link Lose Forwarding) Disable/Enable·DIP Switch 3: Fiber to TX LLF(Link ... Lose Forwarding) Disable/Enable LED Indication·FX, TX, FEF, RX, PWR, 1000MPower ...