Signal loss on cat6 100’

jharvey0923 · Jul 28, 2018

Ok, I am hard wiring my computer to my router. With a Cat5 10’ cable, I get 117 mbps download and 10 up. When I installed my 80’ cat5e cable in the attic, I am getting 67 mbps down and 10 up. I thought I broke my cable so went and bought a new cat6 100’ cable. With it still coiled up in the bunch, connection right from the router to the computer, I got 66 down and 10 upload. ?????? As soon as I did that speed test, I went back to the 10’ cable and got 119 down and 11 up. What is going on?? Everyone says there is no lose of signal under 300’. But????

bill001g · Jul 28, 2018

That is strange. Ethernet only runs at fixed speeds, the speed is controlled by the ports. In most cases the speed is running at 1gbit but if you have older equipment it can run at 100mbit.

The port will run at 1gbit or run at zero gbit. So if you transfer data for 1 second at 1gbit and 9 seconds at 0gbit you get a 10second average speed of 100mbps. PC show average speed not the actual speed the cable is running.

You might be taking errors on the cable. You should be able to see it by ping the router. It is not very common. You get loss not higher latency. It will cause longer transfer times because of the loss but it does not actually transfer at a different rate. It transfers the data at 1gbit with errors and is discarded.

It would be nice if a pc showed how many data errors it had on the port but I have not found a way to display that easily.

To make things simpler try a pc-pc tranfer inside your house. A old tool called IPERF is extremely simple and because it is simple too it will not be affected by the machines or memory and such.

Now your cable could be the problem if you are buying fake cable. There is a lot of so called CAT whatever that is not actually certified cable. It is CCA cable or it is that silly flat or thin cable. The wire must be pure copper and have a wire size between 22-24. Anything else is not a certified cable according to the eia/tia standards.

jsmithepa · Jul 28, 2018

"You installed..." did you own crimping/punching? don't untwist pairs more than 1"

^he said fake cable... a dead giveaway, pairs are untwisted. You should see 4 cable pairs, each of which have ~3 twist per inch.

No sharp bends.

No running signal cables parallel closer than 6" to nearest power cords.

Running next to Air Cond? high power fans? no-no.

jharvey0923 · Jul 28, 2018

bill001g :

That is strange. Ethernet only runs at fixed speeds, the speed is controlled by the ports. In most cases the speed is running at 1gbit but if you have older equipment it can run at 100mbit.

The port will run at 1gbit or run at zero gbit. So if you transfer data for 1 second at 1gbit and 9 seconds at 0gbit you get a 10second average speed of 100mbps. PC show average speed not the actual speed the cable is running.

You might be taking errors on the cable. You should be able to see it by ping the router. It is not very common. You get loss not higher latency. It will cause longer transfer times because of the loss but it does not actually transfer at a different rate. It transfers the data at 1gbit with errors and is discarded.

It would be nice if a pc showed how many data errors it had on the port but I have not found a way to display that easily.

To make things simpler try a pc-pc tranfer inside your house. A old tool called IPERF is extremely simple and because it is simple too it will not be affected by the machines or memory and such.

Now your cable could be the problem if you are buying fake cable. There is a lot of so called CAT whatever that is not actually certified cable. It is CCA cable or it is that silly flat or thin cable. The wire must be pure copper and have a wire size between 22-24. Anything else is not a certified cable according to the eia/tia standards.

jharvey0923 · Jul 28, 2018

Thank you very much for the quick and great answers. However, upon redoing my steps, It looks like one of my own connectors was miss crimped. I replaced it and now have zero loss of signal.

jsmithepa · Jul 28, 2018

Our future Robot Overlords will be saying, yup is the human!

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