Problems with MikroTik S+RJ10?

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

  1. ewer0012

    ewer0012 New Member

    Feb 10, 2019
    Likes Received:
    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:
  2. Waterkippie

    Waterkippie New Member

    Oct 12, 2017
    Likes Received:
    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.


    So either lower the speed to 1G/2.5G/5G and check again? Or just switch to fiber for this distance :)
    Last edited: Apr 15, 2019 at 5:24 AM
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