Asynchronous Transfer Mode

(A-T-M)

A network technology consisting of fixed-size data packets. Because of these fixed-size packets all data types can be transmitted with the assurance no single data type will take over the network. Also, ATM can result in much faster data transfer rates than many current network technologies.

One major difference between ATM and TCP/IP is that ATM fixes the route between two points when data transfer begins. This can result in the faster speed but can also make the pathway vulnerable to network traffic surges.

ATM can come in different service types:

• Constant Bit Rate: Fixed bit rate (steady data stream).
• Variable Bit Rate: Contracted throughput, but data may not be sent evenly.
• Unspecified Bit Rate: No guarantees on throughput.
• Available Bit Rate: Guarantees a minimum capacity but allows more data if the network can handle the load.

More Information

• ATM Tutorial
• The ATM Forum