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Saturday, February 6, 2010

Tree Topology

Tree Topology

In tree network, the nodes are connected to each other in such a way that forms a tree like structure. Typically to form a tree network, multiple star topologies are combined together. This type of network has combined features of bus and star topology.

On tree topology the hubs of each star topology are connected to the central hub that controls the entire network. However, some nodes can be directly connected to the central hub. The tree topology configuration is shown in figure below.

The central Hub in the tree network is an active hub. It contains a repeater (a hardware device), which re-generates the received bit patterns. The secondary hubs usually are passive hubs. The passive hub controls the nodes directly connected to it and exchange data to other devices connected to the other secondary hubs (or same hub) through the central hub. The secondary hub may also be active hub if another secondary hub is directly connected to it. The cable TV network is an example of tree topology, where main cable is divided into, branches and each branch is further divided into smaller branches and so on. The hub is used when a branch is created.

Tree Topolgy

Advantages

The tree topology has the same advantages as star topology but it has some additional advantages. These are.

  • It allows more devices to be connected to the central Hub.

Disadvantages

The tree topology also has the same disadvantages as star topology built has some additional disadvantages such as:

  • It because more expansive because more hubs are required to install the network.

Hybrid Topology
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