Gigabit LAN not working

[QuiGoneGin]

My family recently got an upgrade from 100mbit to Gigabit ethernet and with it the service provider routed fibreoptic cables. If i hook up my laptop into the wall with a Cat 5lan cable on the first floor, it reads around 500mbit/s Up and 950mbit/s down. If i plug my laptop in on the second floor it reads 90Mbit/s Up and down. My Gaming PC(Ryzen z 1700X, X370killer sli MOBO) also only reads 100mbit/s while our 7 Year old iMac on the first floor reads 750Mbit/s Up and 800Mbit/s down.

Is it a software issue or purely hardware?

I tried changing the Network speed from automatic to 1GBit but then the LAN won't connect anymore.

Any tips on solving this? (on other forums they only talk about the cable and the Bandwith limit of the router or computer but that doesnt seem to be the problem)

Thanks for the help in advance...

[Lurick]

Sounds like a damaged cable since Gigabit requires all 4 pairs (8 wires) to be connected/in good shape to negotiate at that speed. If 1 wire is damaged then you'll drop down to 100Mbit in most cases.

[Windows7ge]

If the slow speeds are consistent with using the port on the second floor then it sounds like a bad cable.

[QuiGoneGin]

Not a broken cable, i tried 3 different ones all have the same result.

[Alex Atkin UK]

4 hours ago, QuiGoneGin said:

Not a broken cable, i tried 3 different ones all have the same result.

I think people mean the cable in the wall.  How does that all connect back, do they go into a switch or straight into the router?  You need to try the same ports they plug into to see if some are faulty or its the cables to the sockets in the rooms.

Also trying as many of those different devices as possible directly into the router, just to confirm its not those machines having issues.

Also, what are you using to test the speed?  The inconsistency on all but the 90Mbit one could simply be the servers not handling your speed.  Gigabit is quite a hard test when many speedtest servers are only 10Gbit themselves.

 

[QuiGoneGin]

i used the ookla and quickline speedtests. The fibreoptic cable goes into some sort of box on the first  floor, and from there we have 4 cables going into the wall to 4 spots on 2 floors. I tried to switch the cables from the box to see if one is broken but this doesnt work. the cables on the first floor output gigabit but on the second they dont. It could be that the guy who installed the cables broke them somehow when routing them upstairs...

[Falcon1986]

1 hour ago, QuiGoneGin said:

i used the ookla and quickline speedtests. The fibreoptic cable goes into some sort of box on the first  floor, and from there we have 4 cables going into the wall to 4 spots on 2 floors. I tried to switch the cables from the box to see if one is broken but this doesnt work. the cables on the first floor output gigabit but on the second they dont. It could be that the guy who installed the cables broke them somehow when routing them upstairs...

Yes, if the cables aren't tested you'll never know if they'll work properly until you try to do what you're doing now.

 

If you have a warranty on the work done, you can call the company to let them know and have them fix the cables. Of course, you can always do it yourself but you'll need a LAN cable tester, a cable crimping tool, some RJ45 connectors and some time/patience to re-crimp the ethernet runs. Just make sure that if you're doing it yourself, that you ensure the standard sequence is the same at both ends.