pelibali wrote:
Hi,
I found several unofficial values, how long can be the longest RJ45 network cable. Few sites listed about 12 meters, but I saw 20 meters and also 300ft as well; later being in fact around 90 meters (!).
Could someone pass me please to the correct direction, where some exact (~official) theoretical/practical details are listed?!
Thank you, Pelibali
It depends on the type of cable that you are using. If you are using UTP (Unshielded Twisted Pair) CAT5e, then the maximum distance that you want to cover in an ideal environment is 100 meters. Beware that UTP can be very susceptible to interference from other network cables, power cables, machinery, and other types of interference. Please keep in mind that as well as external interference the greater the length of copper that a signal must pass, the greater the chances for errors. I am sure that you could find some decent documentation from Cisco's website. If you are very interested in this subject, and have a few bucks, get Cisco's CCNA Guide. It is a great reference and filled to the hilt with interesting information on networking. James W