Name the ATM layers and their functions or, Different function of different ATM layer

ATM : 

            ATM stands for Asynchronous Transfer mode. It is a stream line packet transfer interface that makes the use of fixed size packet called cells.It results in an efficient method for transmission over high speed network. It also known as cell relay. It is a connection oriented network.

Features : 

(1) ATM involves the transfer of data in discrete chunks/cells

(2) ATM allows multiple logical connection to be multiplexed over a single physical interface.

(3) ATM is a stream line protocol with minimal or minimum error and flow control capabilities.

(4) It provides high data rate ranging 25-6Mbps to 622Mbps.

(5) It is switable for high data traffic

(6) Reliability and fidelity of modern digital facilities.

Name of the ATM Layer : 

                                              ATM uses a different protocol architecture than of frame relay, X.25 etc.

It has four different layer and three different management plane.

Layer :

             It consists three layer. These are : 

(i) Physical layer    

(ii) ATM layer   

 (iii)  ATM Adaptive layer

i) Physical Layer :

                                 Physical layer defines the specification of transmission medium and signal encoding mechanism.It also specifies data rate, bit timing roltages and various other issues.

ii) ATM Layer : 

                           ATM layer defines the transmission of data in a fixed size cell. It also defines the mechanism of logical connection. if provides the layout of a cell and its header format. It has the packet transfer capabilities and condition control.

iii) ATM Adaption Layer :

                                                The layer above the ATM layer allows the user to send packet layer than a cell. This layer segmentic the packet that are transmitted and reassembless them at the other and this layer individually take care of every layer cell.

The AAL modes higher layer information into the ATM cells and called information from ATM cells to deliver in the higher layer.

Plane : 

              It has three planes. There are : -

i) User Plane

ii) Control Plane

iii) Management Plane

i) User Plane :

                           It deals with data transport flow control error control and other user transmitions.

ii) Control Plane :

                                           It deals with connection control and flow and error control.

iii) Management Plane :

                                           It deals with plane management performs the management function related to the systems as a where it also provide and destination between the plane.  

 

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