Slow speeds with 100m Cat-7 cable

[silk gull]

Hello everyone,

I need to run a 100m Ethernet cable between 2 buildings.

I have a 1gbps switch, Cat-7 cable (shielded, rated for 10gbps), with cat-6 wall plates.

With this setup, the max I’m getting is 93mbps at my computer. I should be getting ~350mbps - which I do get with a 10m run of Cat-6 cable, and all the other setup exactly the same. The only diff is the 100m cable.

I thought it could be because the cat-7 cable is still spooled up and maybe causing some sort interference? But then, these cables run in huge trunks.

Ideally I need around 1gbps going through this cable as I’ve got this speed internet coming soon.

What could be the issue? Any advice would be appreciated 🙂

[acoustic hollow]

100 meters is a long distance for Ethernet. That would be my guess as to why it isn’t working.

You should really be using fiber at that distance.

[silk gull]

Cool thank you. I thought 100m would be okay. I spoke to the company beforehand and they said so too.

Do you have any experience with fibre and quick tips on what I should look out for?

[acoustic hollow]

I don’t have any hands on experience with running fiber or terminating. I’d recommend buying pre-terminated cables if you can and then using fiber to Ethernet converters at each end if your equipment only has Ethernet.

[silk gull]

Yep, I was planning on getting pre-terminated. Cables. Ideally I would have liked to put my own connectors on so I can get the length just right. I’m planning on getting these for converters.

https://amzn.eu/d/dvMmtm9

[acoustic hollow]

Sounds good. Looks like that would work fine

[silk gull]

Awesome. I’ll post back with an update 🙂

[heavy elbow]

are both ends auto negotiating to 1gb link speeds ok? id check them regularly, 100m should be fine but i had one run about 30m that kept dropping off 1gb onto 100, so i redone the punchdowns further down the cable (only 1cm or so just to get fresh punches) and its been fine since, 4+ yrs now

[silk gull]

It was dropping to off too 100 for some reason but not sure why.