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Why is my ethernet connection stuck at 93 Mbps?

Karb0ne_ Posted messages 5 Status Member -  
yg_be Posted messages 23437 Registration date   Status Contributor Last intervention   -

Hello everyone, I'm reaching out because I'm currently lost!

Let me give you some context, I recently bought an Ethernet cable (cat7).
I tested it for the first time by connecting it from my box to my desktop PC. By the way, I have fiber, if that helps.
After connecting everything, I ran a test using SpeedTest.
I was happy because I was getting over 950 mbps.


I ran the cable through the attic the next day and then through a hole in the ceiling to bring it down to my PC level.
But now, when I reconnect everything, I'm stuck at 93 mbps. I've tried everything, unplugging, replugging, disabling the network adapter, re-enabling it. I don't know what else to do. Can anyone help me get back to the speed I had?
Thanks in advance :)

3 answers

  1.
    jee pee Posted messages 31963 Registration date   Status Moderator Last intervention   10 009
     

    Hello,

    It seems you're on a 100 Mbps connection, which means you're using only 2 pairs out of the 4 in the cable. Did your cable originally have male connectors at both ends, or did you wire the RJ45 connectors yourself?

    Most likely, either you damaged the wiring of one of the connectors while handling the cable, or, more rarely, you broke one of the 8 wires inside the cable by pulling on it.

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  2. Karb0ne_ Posted messages 5 Status Member
     

    Are the two ends of an Ethernet cable not the same?
    I didn't do anything myself, I bought the cable pre-made.
    Is it possible that by changing the direction of the cable I could get back to the previous speed?

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    1. jee pee Posted messages 31963 Registration date   Status Moderator Last intervention   10 009
       

      The 2 RJ45 connectors are the same at both ends, there is no direction.

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      1. Karb0ne_ Posted messages 5 Status Member > jee pee Posted messages 31963 Registration date   Status Moderator Last intervention  
         

        Yes, they are identical.

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    2. brupala Posted messages 111188 Registration date   Status Member Last intervention   14 462
       

      Hello,

      in principle, no, reversing the cable won't change anything; however, it is possible that one of the ports, whether on your box or your network card, has a bad contact on the RJ45, which might cause it to work less with one of the two ports.

      It’s more likely that in passing your cable, you have dirtied the port that has been moved, so I recommend cleaning your male connectors with a cloth or a brush soaked in alcohol or glass cleaning solution.

      Hoping that, as JP said, you haven't broken a wire in the cable by pulling on it or by making too sharp a bend.

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    3. yg_be Posted messages 23437 Registration date   Status Contributor Last intervention   1 588
       

      Hello,

      I would remove the cable from the attic passage and test it as you did the first time.

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  3. Karb0ne_ Posted messages 5 Status Member
     

    I tried to clean the cable outputs well despite its almost new appearance.
    It didn't change anything. Why would I still have 93 mbps running continuously if the cable were damaged?

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    1. brupala Posted messages 111188 Registration date   Status Member Last intervention   14 462
       

      it has been explained to you:

      if you have 4 pairs, the 1 Gbit/s rate is negotiated; if one pair is missing, or even one wire among the 4/5/7/8, we only work at 10/100 Mbit/s, so only with the two pairs 1/2 and 3/6.

      a cable tester would confirm the fault.

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      1. Karb0ne_ Posted messages 5 Status Member > brupala Posted messages 111188 Registration date   Status Member Last intervention  
         

        Alright, so all I have left to do is order a new cable then.
        Thank you for your help.

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      2. brupala Posted messages 111188 Registration date   Status Member Last intervention   14 462 > Karb0ne_ Posted messages 5 Status Member
         

        Still, one more thing:

        When installing a fixed RJ45/twisted pair cable over a long distance, you shouldn't use a flexible direct cord as you did, unless it’s a very temporary installation; even in 2025, there are other wireless systems.

        In fact, a solid cable with two wall sockets or even just female connectors and two flexible cords, one at each end, will be used.

        Otherwise, see this too.

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      3. Karb0ne_ > brupala Posted messages 111188 Registration date   Status Member Last intervention  
         

        I didn't understand everything, I'm not from the computer world ???? I admit I simply thought I would have a better connection with an ethernet cable connected from my PC to the box.

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      4. brupala Posted messages 111188 Registration date   Status Member Last intervention   14 462 > Karb0ne_
         

        It's always true, especially since we can now easily reach 10 Gbit/s through this means, but one must still do it properly, for example by seeking advice before the experiment as soon as we move away from the simple cable lying on the floor or on the desk.

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