Bus network

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Topology of a bus network

A bus network is a network topology in which nodes are directly connected to a common half-duplex link called a bus.[1][2]


A host on a bus network is called a station. In a bus network, every station will receive all network traffic, and the traffic generated by each station has equal transmission priority.[3] A bus network forms a single network segment and collision domain. In order for nodes to share the bus, they use a media access control technology such as carrier sense multiple access (CSMA) or a bus master.

If any link or segment of the bus is severed, all network transmission may fail due to signal reflection caused by the lack of electrical termination.[citation needed]

Advantages and disadvantages[edit]


  • Very easy to connect a computer or peripheral to a linear bus.
  • Requires less cable length than a star network resulting in lower costs.
  • The linear architecture is very simple and reliable.
  • It works well for small networks.
  • It is easy to extend by joining cable with connector or repeater.
  • If one node fails, it will not affect the whole network.


  • The entire network shuts down if there is a break in the main cable or one of the T connectors break.
  • collisions occur in the network resulting in packet loss.
  • This topology is slow with many nodes on the network.
  • It is difficult to isolate faults in the network.


  1. ^ "Network Topologies" Archived 2015-07-20 at the Wayback Machine Teachbook Blog, Accessed August 4th 2015.
  2. ^ Janssen, Cory "What is a Bus Topology?", Techopedia, Accessed August 4th 2015.
  3. ^ Knott, Geoffrey; Waites, Nick (2002). BTEC Nationals for IT Practitioners. Brancepeth Computer Publications. p. 395. ISBN 0-9538848-2-1. ...all stations have equal priority in using the network to transmit.