My Internet provider just installed a 2,5/1Gbps Internet connection and I’ve asked the guys to run a couple of their fiber to connect my router (HP Prodesk with OPNsense) to my server. I didn’t know that the fiber is single mode and all the SFP+ sold used now seems to be all for multi mode fiber (www.bargainhardware.co.ukfor example). The cable is about 30m, can I use a 810nm SFP+ or is it definitely better to use a 1310nm?

  • @dhorkEnglish
    2•6 months ago

    Oh, they just left you some extra patch cables? That was nice of them.

    The wavelength of the fiber might be printed on it. I know some fibers are color-coded based on their wavelength, but I don’t know if it’s universal.

    You’ll need to match the modules to the fiber.

    • @peregusOP
      2•6 months ago

      I’ve checked on a forum and they say:

      GPON adopts WDM to transmit data of different upstream/downstream wavelengths over the same ODN. Wavelengths range from 1290 - 1330 nm in the upstream direction and from 1480 - 1500 nm in the downstream direction.

      So I guess that all the single mode SFP+ that have that range are ok.

    • @peregusOP
      1•6 months ago

      Unfortunately there is no wavelength on the cable, I’ll check the ONT