How many bytes are in a fixed cell size used by ATM?

Asynchronous Transfer Mode (ATM) uses a fixed cell size of 53 bytes for its data packets. This size consists of 48 bytes of payload and 5 bytes of header. The design of ATM is such that the fixed cell size allows for predictable data transfer and efficient handling of various types of traffic, including voice, video, and data. The standardization of the 53-byte cell size aids in maintaining timing and synchronization, which are critical features in the transmission of real-time communication.

The choice of 53 bytes is significant as it strikes a balance between the need for error correction capabilities and the efficiency of network throughput. The payload size of 48 bytes allows for the carriage of user data, while the 5-byte header contains essential information for routing and managing the cell through the ATM network.

Other options do not align with the established specifications of ATM, which include neither 32 bytes nor 64 bytes, as these sizes do not support the operational requirements of ATM technology. A cell size of 48 bytes is also inadequate because it does not encompass the necessary header information required for proper functioning within the ATM framework.