100mg over cat5e

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 Question by tony rodway-brown posted 24 May 2002
 100mg over cat5e
nice site
i need to guarantee 100mg over cat5e cabling, if i am not deploying 90-metre home-runs, in other words using Intermediate Data Frames (IDFs), what is the maximum distance per cable run for every 'break' that is introduced (ie IDFs, extra links to active equipment) to guarantee 100mg performance between active comms equipment and end user IT station. (sorry for the waffly question, hope you can make sense), regards, Tony
 Answer by Dmitri Abaimov posted 03 Jul 2002
Dear Tony,

It has to be not more than 100 meters (considering cable and cords) between two pieces of Ethernet equipment in order to guarantee 100Mbit/s. So, if a workstation and a router are connected to the same hub, the maximum physical distance between then will be 200 meters.

It's not easy to push this distance limit: 100BASE-TX Ethernet is actually very picky in terms of the cable lengths and overall link quality.

Dmitri Abaimov, RCDD

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