Problems with MikroTik S+RJ10?

Discussion in 'Networking' started by ewer0012, Apr 12, 2019.

  1. ewer0012

    ewer0012 Member

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    I was just using 2 of the S+RJ10 to go from my living space to the basement where my rack is for 10Gbe with a 125ft Cat6A cable. They worked great till I started transferring data over that cable, then they got ridiculously hot and started having transmit/receive failures. When I say "they got ridiculously hot" I mean they got ridiculously hot. I was going to see if there was anything physically wrong with them so I pulled one out, it burned my fingers and palm (little bit of blistering, nothing serious). I was a little smarter with the second one and used an infrared thermometer and it read 81C (Mind you it took me a good 3-4 minutes to get my thermometer and get to the basement to check the temp).

    Has anyone else experienced anything like this with RJ45 to SFP+ transceivers? I've read that they run hot, but didn't think that it would be this hot. I'm wondering if I got a couple of defective units, or if they really just run that hot. Everything I've seen online says they run up to about 50C, which is a long ways off from 81C. FYI, it's about 19C in the basement.

    I was running them between two MikroTik switches:
    CSS326-24G-2S+RM
    CRS309-1G-8S+IN
     
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  2. Waterkippie

    Waterkippie Member

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    The cable you are using is too long for 10G, the limit is 30M or 98 ft. See the mikrotik brochure for info on maximum lengths.

    MikroTik

    So either lower the speed to 1G/2.5G/5G and check again? Or just switch to fiber for this distance :)
     
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    Last edited: Apr 15, 2019
  3. ewer0012

    ewer0012 Member

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    I ended up switching to Fiber.

    I tried these S+RJ10 units with a 3ft Cat6a cable between switches and they were still getting up to 75C at the lowest and 79C at the highest. Maybe I just got some defective units? They've since been returned.
     
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  4. Rand__

    Rand__ Well-Known Member

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    were those the old or the r2 version ?
     
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  5. ewer0012

    ewer0012 Member

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    #5
  6. Rand__

    Rand__ Well-Known Member

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    Its on the side were the serial number is. But no problem just wondered
     
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  7. kroy

    kroy New Member

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    You aren’t supposed to run them next to each other. You need a gap in between them.
     
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  8. Rand__

    Rand__ Well-Known Member

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    Then they maybe should add that to the nonexistent manual ;)
     
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  9. kroy

    kroy New Member

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    They do actually mention it on the wiki page for them.

    S+RJ10 general guidance - MikroTik Wiki

    But I definitely agree, they should note that somewhere more clearly. I was having problems with them due to overheating and had to go digging for that advice not to run them next to one another.
     
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  10. Rand__

    Rand__ Well-Known Member

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    Didnt even know that wiki existed - thanks:)
     
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