cross-posted from: https://aussie.zone/post/2534398

The 10GBase-LR is 1310nm and the QSFP-40G-LR4 CWDM channels are 1271, 1291, 1311 and 1331 nm. Are the 1310nm and 3rd channel 1311nm technically compatible?

I have a 10Gb and (will eventually have) a 40Gb switch both fitted with basic LR (Q)SFP+ transceivers and want to know if I can directly connect them or will I have to use an adapter to fit an SFP+ in an QSFP+ port?

I’m looking at using the XQX2502 QSFP+.

EDIT: The goal of this exercise is I’m trying to work out if I can make an easily interoperable system where a singlemode fiber wall jack fed from a 40G switch can act as a both a 10G or 40G port as needed.

    • ky56@aussie.zoneOPEnglish
      1·
      9 months ago

      Yes I am aware of that solution. I should have clarified the goal of the exercise. I’m trying to work out if I can make an easily interoperable system where a singlemode fiber wall jack fed from a 40G switch can act as a both a 10G or 40G port as needed depending on what ethernet card the client is using. I am using singlemode as I want to avoid using MTP multimode cable seeing how much more expensive it is than simple lc-lc singlemode.

      • Eideen@lemmy.worldEnglish
        5·
        9 months ago

        I understand the use case.

        I stand by it is easy to get right, if optic is changing for the difference use cases.

        QSPF is not build to be hotplug in that manner.

  • noride@lemm.eeEnglish
    31·
    9 months ago

    QSFP and SFP are different physical connectors, they are not interoperable.

    • Eideen@lemmy.worldEnglish
      3·
      9 months ago

      Correct, they are different physical connectors. But they are interoperable, if the switch support it.

      There is QSPF breakout to 4x SFP. There is 40G QSFP+ to 10G SFP+ Adapter Converter Module

  • 970372@sh.itjust.worksEnglish
    1·
    9 months ago

    This might be compatible. As the pass band should be wide enough to be in the same range stil.