What is the maximum length of a cable in a local LAN set up? The Cat-5 Ethernet specification dictates that the...
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maximum length a CAT-5 cable can have is 100 meters. In the case you require a cable longer than 100 meters, you need to install a simple repeater I.E. a hub, or a switch, which will allow you to extend the total length.
You should also be aware that there is a specific rule for such situations, it's mostly known as the 5-4-3 rule which dictates that you can have a maximum of 5 segments with 4 repeaters, of which 3 segments are allowed to be populated.
The below diagram will help you understand this better:
Seg1---R---Seg2---R---Seg3---R----Seg4---R---Seg5 | | | PC PC PC
Here you can see there are 5 segments, which are connected via 4 repeaters (R) and there are only 3 segments populated, Seg1, 3 and 5.
Dig Deeper on LANs (Local Area Networks)
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