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Maximum cable lengh for ethernet depends on what kind of ethernet you are talking about!  Here are some details on the most popular kinds of ethernet.  (UTP = unshielded twisted pair)
Gigabit Ethernet (over copper), 1000baseT
Speed:
1000 Mbps
Max Len:
100 Meters
Cable:
UTP, RJ-45 connectors
Fast Ethernet, 100baseT 
Speed:
100 Mbps
Max Len:
100 Meters
Cable:
UTP, RJ-45 connectors
Twisted Pair Ethernet, 10baseT 
Speed:
10 Mbps
Max Len:
100 Meters
Cable:
UTP, RJ-45 connectors
Thin Ethernet , 10 base 2 
Speed:
10 Mbps
Max Len:
185 Meters
Cable:
RG-58 type coax, 50 ohm impedance
Thick Ethernet, 10 base 5 
Speed:
10 Mbps
Max Len:
500 Meters
Cable:
RG-58 type coax, 50 ohm impedance
Ethernet to Fiber
Ethernet to Fiber media converters are starting to come down in price - they can be found for under $150.  When 100Meters is not enough distance, an Ethernet to fiber media converter can be placed on each end making the maximum distance something like 40Km. Another use for fiber is electrical insulation. Some people like to run cables underground between homes. If you run CAT5 cable, the homes have different 'ground potentials' and you will burn out network card durring any electrical storm. The solution is fiber! Run fiber betweeen the homes or run a pair of fiber converters on one end of the cable with a short fiber run. This will electrically separate the two homes.

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Copyright © 2002 Øyvind Haugland
Sist endret:  13 januar 2019
 

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