Presentation of atm(us) in data communication
- 1. University of Burao Department of ICT Course: Data communication and Network Presentation of ATM
- 2. Introduction of ATM • ATM stands for Asynchronous Transfer Mode, is high speed networking standard designed to support both voice and data communication. • The cell used with ATM is relatively small compared to units used with older technologies.
- 3. User data • The user data is divided into small, fixed- length packets, called cells, and transported over virtual connections. • ATM uses short, fixed-length packets called cells to carry data, and combines the benefits of circuit switching with those of packet switching.
- 4. ATM network interface card • An ATM end system contains an ATM network interface card.
- 5. ATM network An ATM network is made up of ATM switches and ATM end systems (e.g. workstations, switches and routers). An ATM switch is responsible for cell transfer through an ATM network. It accepts an incoming cell from an ATM end system (or another ATM switch), reads and updates the cell header information, and switches the cell to the appropriate output interface.
- 7. ATM Reference Model ATM functionality corresponds to the physical layer and part of the data link layer of the OSI reference model. The ATM reference model is composed of the following planes, which span all layers: Control Plane: - This plane is responsible for generating and managing signaling requests. User Plane: - This plane is responsible for managing the transfer of data.
- 8. ATM Reference Model Management Plane:- This plane contains two components: - – Layer management: - manages layer-specific functions, such as the detection of failures and protocol problems. – Plane management: - manages and coordinates functions related to the complete system (End System).
- 9. Physical layer • The physical layer is subdivided into a Physical Medium Dependent sub layer(PMD) and Transmission Convergence sub layer(TCS). • The Physical Medium Dependent (PMD) sub layer is responsible for the transmission and reception of individual bits on a physical medium. • The TCS is create data format.
- 10. ATM cell formats ATM defines two different cell formats: UNI (User-Network Interface) and NNI (Network-Network Interface). Most ATM links use UNI cell format.
- 11. ATM Switches and Interfaces ATM switch supports two types of interfaces: – User-Network Interface (UNI) • Connects an ATM end-point to a switch – Network-Network Interface (NNI) • Connects two ATM switches Public and Private Interfaces UNI and NNI can further be divided to two types One is known as the private type and the other is known as the public type
- 12. Private and Public UNI Private UNI – Connects an ATM end-point to a private ATM switch Public UNI – Connects an ATM end-point or a private ATM switch to a public ATM switch
- 13. Private and Public NNI Private NNI – Connects two ATM switches within the same private organization Public NNI – Connects two ATM switches within the same public organization
- 14. Conclusion • ATM stands for isochronous transfer mode • ATM was originally designed in the mid 1980s for use in public networks, but has also been organized as the backbone technology in private networks.
- 15. Group name • Group Names: - • 1- Abdiaziz ibrahim jama • 2- Abdiqani muuse ducaale • 3- Kayse cabdi cali • 4- Zekeriye xussien xasan • 5- Osman muuse x.dirir • 6- Abdihakim abdirazaq nour