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Ethernet limitations

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by tony.griscavage

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I know the distance limitation of ethernet UTP is 100m, which is actually 328 ft. My question is that this is 1 straight cable with no breaks in it. I'm trying to cable this project using patch panels. After doing some research for this I found that the distance from patch panel to patch panel is 268 ft. Now I have to accomadate for patch cables which will only allow for 60 more feet, with some more ends added to this equation. I read somewhere that you loose 10ft of distance with every end(RJ45) you add. Can someone shed some light on this and if this is true where will I be able find this in print. Thanks for your help.

3 replies

by ann777

Read through Chapter 3 here:

http://www.ab.com/manuals/cn/enet-in001a-en-p.pdf

Ethernet is not so terribly limited; the 100m limitation applies between active devices. You can add a switch or hub at or near 300 feet to extend distance limitations.

I worked in an "L" shaped building where the distance limitations were expanded by having two separate "electrical rooms" (where the patch panels and a router and hubs were located -- one setup from the demarc point and backboned to the second electrical room) and experienced no problems with this type of setup.

Do not allow cable splicing or jumpering without hubs/switches in place; make sure you have good cable testers and that each of the lines are tested several times.

by tony.griscavage

Thank you for your help. With this question. I finally convinced the power to be that the use of patch patch panels in this circumstance was not fesiable.

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