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Ethernet/802.3 Repeaters

A group of computers connected to a thin-wire (coax) Ethernet cable is called a segment, thus:
Thinwire segment
A thin wire (coaxial cable) segment has a maximum length of 185 metres. This can be extended using a repeater[2], which behaves somewhat like an amplifier. The resulting larger LAN acts like a single large segment, and is referred to as a "collision domain".
 
[2] a maximum of 4 repeaters is allowed between any two stations.

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