ATM consists of 3 layers AAL (adoption layer) ATM layer (similar to DataLink layer) and Physical layer. AAL layer has no equivalent in the OSI model.
International Organization for Standardization (ISO) or Open Systems Interconnection Basic Reference Model has the following seven layers 1. Application layer,2. Presentation layer, 3. Session layer, 4. Transport layer, 5. Network layer, 6. Datalink layer and 7. Physical layer Asynchronous Transfer Mode is the most reliable mode of transmission used at present It has the following layers 1. Network layer 2. Data link layer 3. Physical layer OSI was used for transmission over unreliable medium while ATM is used for reliable transmission as it employs error detection and correction mechanism
OSI reference model as defined in ITU-T recommendation x.200(ITU-T as 1994d) is a logical architecture which defines a set of principles including protocol layering, layer service definition ,service primitives and independence. these principles are suitable for the definition of the B-ISDN /atm.However, not all of these principle have been fully applied in the B-ISDN PRM.
The X.25 standard specifies protocols at the Physical, Data Link, and Network Layers of the OSI Model.Broadband Cable functions at both the Physical, and Data Link Layers.ISDN functions at the Physical, Data Link, and Transport Layers.DSL, SONET, and T-Carriers function at the Physical Layer.Frame Relay, and ATM function at the Data Link Layer.
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