Mellanox QSFP to SFP+ Adapter $10

Discussion in 'Great Deals' started by BeTeP, Oct 1, 2019.

  1. BeTeP

    BeTeP Active Member

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    #1
  2. Aestr

    Aestr Well-Known Member

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    In for 10 thanks!
     
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  3. lec668

    lec668 New Member

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    Great, thx !
     
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  4. nezach

    nezach Active Member

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    Been waiting for this, Thanks!
     
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  5. Sleyk

    Sleyk Active Member

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    I have a question about these. I see that it allows you to use SFP+ transceivers in a QSFP slot. Does this allow you to obtain 40Gbps through your older LC-LC multimode fiber? Should work right? As long as it is connected to a 40Gbp adapter? Or will it downclock to 10Gbps through this adapter?
     
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  6. Aestr

    Aestr Well-Known Member

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    10gbps. I’m pretty sure it’s just pulling one of the four rx/tx pairs from the qsfp connector.
     
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  7. Evan

    Evan Well-Known Member

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    25G Max currently assuming an SFP+, I have used Cisco ones in other devices before
     
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  8. Aestr

    Aestr Well-Known Member

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    That's on a 100gbps adapter though, not a 40gb right?
     
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  9. Evan

    Evan Well-Known Member

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    25G SFP (100G QSFP28 port)
    This is just an adapter, you still need to obey the ASIC behind the port limitations and the SFP+ you have inserted. Meaning a 10G-SR won’t suddenly do 25G.
    If the port/asic supports I have been crazy enough to use GLC-T in a 100G capable port (some maybe even most 40/100g ports will run at 10/25 or even 1G with the appropriate adapter)
     
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  10. Aestr

    Aestr Well-Known Member

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    Agreed. I was just clarifying for @Sleyk as they were talking about a 40gb adapter specifically.
     
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  11. Sleyk

    Sleyk Active Member

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    Yeah, was wondering about the 40Gb adapters. I wanted to keep my existing fiber and I wondered if OM3 was capable of going to 40Gbps with these adapters, but I suppose no.

    Im starting to wonder now about maybe going to 25Gb? I know its a different protocol though.

    Damn, I wish we had one fiber standard.
     
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  12. Evan

    Evan Well-Known Member

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    OM3 will support 40G bidi to 100 meters,
    OM4 extends that to 150 meters.
     
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  13. BeTeP

    BeTeP Active Member

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    If your existing OM3 is just 2 LC terminated fiber strands (you would probably not be asking this question if your fiber was MPO terminated) and you want to get 40Gbps - you would need 2 QSFP+ 40G BiDi transceivers at $100+ ea per link.
     
    #13
  14. Evan

    Evan Well-Known Member

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    40G BiDi don’t really cost $100 do they ?
    Looks at ebay... not that far off, $40 and up each.
     
    #14
  15. BeTeP

    BeTeP Active Member

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    I see one lot at $55ea, another at $78ea and everything else is $85+. Still too expensive for my blood (for home use). But it is nice to see the price going down since I checked last time.
     
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  16. Sleyk

    Sleyk Active Member

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    Ouch my wallet cries, brother!
     
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