From the name of the network itself many inferences of the network can be derived. A bus topology in more technical terms means that it is a method of transmission on networks that uses a common vehicle for transmissions and thus it is categorized as shared communication. Imagine a bus picking up various people from one stop and dropping of people as it travels and then picking a few more. That is what happens in a bus network exactly.
However in a Bus topology only one device is allowed to transmit at a given point of time. The DAP or the Distribute Access Protocol has the information about which station has to transmit the data. The data that is being transmitted have frames that will have the source name and the network address.
Bus Topology Functionality
The bus topology connects each computer on the network into something called the segment trunk. A bus is usually referred to a cable that connects end to end and this is used to transmit the signals from one end to the other end. At every end a terminator is placed so that it understands in which direction the data is traveling and also the terminator is used to absorb the signals. If the terminator does not absorb the signal then the same signal is reflected back to the bus confusing the whole data flow. The bus is considered to be a passive network because the computers are largely dependant on the signal that is being transmitted.
Bus Topology Advantages
The advantage of the Bus network is that if one computer fails in the network the others are still not affected and they continue to work. Bus network is very simple and easy to set up. If there is an urgent need to set up a network and perhaps be used on a short term basis then the Bus network is the best possibility. Bus networks use the least amount of cable to set up making it cost effective.
Bus Topology Limitations
In the bus network you will need a network connection in order to determine if the data is being transferred between two nodes. If the data transfer rate is high then the Bus network does not perform very well because the data travels in a stream and cannot be overloaded. The bus network is a bit challenging when you have to troubleshoot the problems. Bus networks are not suitable as large networks as there are limitations to the number of nodes you can set up for one single cable. As the number of computers increase in the network the data transfer rate goes down accordingly and noticeably.
Bus Topology Conclusion
The bus networks in spite of its limitations is considered to be the easiest and the fastest network that can be set up compared to the other kinds of network. In bus networks there is a collision handling system which ensures that data travels without errors and data is delivered correctly.
There is a bus master on the network which ensures that data is flowing in the right direction and order. All the computers on the bus network however listen for the signals and they do not hold the responsibility to move the signal forward. The signal carries forward on its own. So if one computer is not receiving any signals the signal still carries forward without stopping at the computer that has failed. These days bus networks are less common due to the advancement of networks and there are much lesser complicated networks that are easy to operate and efficient. However even these newer technologies derive their basics from older technologies like the Bus Topology.