ATM versus IP for Voice over IP
RAKESH KUMAR KAJJAM
In this paper we mainly discuss about the technologies called asynchronous transfer mode(ATM) and internet protocol(IP).These are the two technologies that are having their own importance in today’s communication world of transmitting the voice and video signals over a network between a source and destination.We are about to see the main differences between these technologies and compare them theoretically and practically.An advanced software called OPNET modeler is used in comparing these two technologies for different parameters such as traffic issues,Queuing delays,quality of service(QOS),congestion,time of response etc.,
‘’NETWORK’’ this is the word that is well known by every individual of this generation as it has become their part of life right from the start of their day till it ends.After the evolving of internet there are many applications that came in to the existence producing different results in different applications where they are used and made the communication look easier from one part of the globe to the other.In any of the network topology the particular vendor will look for quality of service(QOS),reducing the congestion,etc., When dealing with voice and video transmission,there are particularly two technologies called asynchronous transmission mode(ATM) and internet protocol(IP).depending on the demand of the vendors,These two technologies have their own importance and are applicable in real time applications.The foremost difference between these two technologies is that ATM technology depends on switching where as IP technology follows the routing method. Other than these two technologies there is other technology known as MPLS.This is known as the advanced version of the ATM.MPLS stands for multi protocol label switching and the function of the MPLS is to switch between the traffic and routers.This will help in speed,scalability and quality of service(QOS),the main problems that are faced in today’s communication world.This is not discussed in our paper. A detailed analysis on ATM and IP for different parameters is discussed and a comparison is done between these two technologies using OPNET modeler.In the next section we will have brief description about the asynchronous transfer mode and internet protocol. ASYNCHRONOUS TRANSFER MODE
Asynchronous Transfer Mode(ATM) is a technology that is required in transferring the data in terms of cells or packets that are of a fixed size.The size of the cell that are used with the ATM technology are small when compared with the carriers that are used with the other technologies.The function of the ATM is to transmit video,Audio and data belong to computer to the other computer over the same network.While transmitting the data from the source to the destination ATM creates fixed channel or route between them for the transfer of the data.This type of transmitting the data is completely different from TCP/IP in which the message is divided into packets that take different routes from the source to the destination.
Figure shows ATM network
There are three other terms that are to be discussed while having a brief description of ATM.They are * Transfer mode
* Cell based transfer and
* Asynchronous transfer.
ATM has features such that it is as speed as circuit switching and also more flexible as packet switching. The transfer mode in ATM is neither circuit switching nor packet switching.It adapts both the transfer modes and the main reason for this is it uses cells which are small sized frames. Cell based transfer
The ATM cell consists of fixed size frames and each frame consists of 53 bytes of data of them 5 bytes are dedicated to carry the header information and the remaining 48 bytes are to carry the information data.Each cell in the ATM is identified using virtual channel identifier(VCI) or virtual path...
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