I bought 2 boxes equipped with TP-Link TL-SM321B SFP modules. The aim is to create a very simple network to extend an RJ45 cable. So I have RJ45MC220L Fibre single mode LC MC220L RJ45.
However, it's impossible to establish a connection between the two... the FX Link LEDs are always off. Of course, I tested with several different fibres. When I connect a box to the Swisscom fibre connection in my home, the LED lights up.
I saw that on older hardware versions, there was a physical button on the back to force transmission to one side when using 2 MC220Ls together. But this is no longer the case on the V4 hardware... Does anyone have any clues? Thanks

Question

I bought 2 boxes equipped with TP-Link TL-SM321B SFP modules. The aim is to create a very simple network to extend an RJ45 cable. So I have RJ45>MC220L> Fibre single mode LC> MC220L> RJ45.
However, it's impossible to establish a connection between the two... the FX Link LEDs are always off. Of course, I tested with several different fibres. When I connect a box to the Swisscom fibre connection in my home, the LED lights up. 
I saw that on older hardware versions, there was a physical button on the back to force transmission to one side when using 2 MC220Ls together. But this is no longer the case on the V4 hardware...  Does anyone have any clues? Thanks

Accepted Answer

In the meantime, the answer has been found: you need a TL-SM321B SFP module opposite a TL-SM321A SFP module. One transmits on 1310nm and reads on 1550nm and the other transmits on 1550nm and reads on 1310nm. 
So it's logical that if you put the same SFP module at both ends, it won't work!

Answer

Are the RJ45 patch cables or cross-over?

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