MTU on affordable SFP+ to RJ45 modules

Discussion in 'Networking' started by bateau, Nov 18, 2018.

  1. bateau

    bateau Member

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    Hi, anybody know of an affordable SFP+ 10gbt module that support jumbo frames?
    My investigation so far (edited with feedback):

    Mikrotik S+RJ10 (around $65): NOK. 1500 max
    Ubiquity UF-RJ45-10G (around $65): ? (probably not, same price as mikrotik's module)
    Edgeoptic 10G-SFP-T (around $65): ? (probably not, same price as mikrotik's module)
    Fluxlight SFP-10G-T (around $150): NOK
    FS.com SFP-10G-T (around $160): OK. Need to set on a fixed speed, at least when used in a Mikrotik switch.
    Planet MTB-RJ (around $170): ?
    ENET SFP-10G-T-ENC ($375): OK

    Planet XT-705A Media Converter (around $200/260 EUR): OK, 16K

    any others?
     
    #1
    Last edited: Dec 3, 2018
  2. Kal G

    Kal G Active Member

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    The only one I’ve confirmed so far that supports jumbo frames is the ENET SFP-10G-T-ENC, but I wouldn’t consider at cheap at $375.

    You can add the Fluxlight SFP-10G-T to your list of modules that don’t support it.
     
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  3. Magebarf

    Magebarf New Member

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    What size of jumbo frames on the ENET model, any idea?
    All other devices I have that are capable of 10GBASE-T or NBASE-T are 16K, but I don't know if that's been more standardized than with the 1000BASE-T?
     
    #3
  4. Kal G

    Kal G Active Member

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    I’m not sure if it supports above 9000; I don’t have a switch capable of testing that. Doesn’t look like ENET lists the max mtu on their site either.
     
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  5. Magebarf

    Magebarf New Member

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    Hmm, haven't considered that part before, but does both the NIC as well as the SFP module itself have buffers, or does the SFP module rely on what buffer the MAC Layer provides?

    Configuration wise you'd set the Jumbo frames on the NIC level, but I'm unsure if that is a boiled down aggregate value based on the NIC+SFP module combo, or simply reliant on the NIC itself.
     
    #5
  6. bateau

    bateau Member

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    By the way, FS claims that their EUR 160 module does jumbo frames. Will test. Updated the first post.
     
    #6
    Last edited: Nov 20, 2018
  7. Kal G

    Kal G Active Member

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    The modules don't have onboard buffers. That is left to the switch or NIC to provide.
     
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  8. pcmoore

    pcmoore Member

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    There is likely a small buffer simply to handle the conversion from SFP+ (from what I understand this is a simple serial protocol) to 10gbase-t. Also, looking at the datasheet for the PHY used in the Mikrotik S+RJ10, there is mention of some FIFOs for processing.

    PHY Transceivers - Alaska X 10 Gigabit PHY - Products - Marvell
     
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  9. pcmoore

    pcmoore Member

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    #9
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