In local area networks where bus topology is used, each node is connected to a single cable.
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Since the bus topology consists of only one wire, it is rather inexpensive to implement when compared to other topologies.
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For example, the original twisted pair Ethernet using repeater hubs was a logical bus topology with a physical star topology layout.
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Shared cable Ethernet was always hard to install in offices because its bus topology was in conflict with the star topology cable plans designed into buildings for telephony.
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FireWire devices are organized at the bus in a tree topology.
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The structural topology is the same, consisting of a tiered star topology with a root hub at level 0 and hubs at lower levels to provide bus connectivity to devices.