Atm adaptation layer validating the atm header
Computer networks, television networks, and telephony networks in particular are experiencing an unprecedented technological expansion, fueled by consumer demand.
ATM does not rely on any specific bit rate, encoding scheme or medium and various specifications for ATM exist for coaxial cable, shielded and unshielded twisted pair wire, and optical fiber at speeds ranging from 64 kilobits per second to 9.6 gigabits per second.
A communication protocol is a set of rules and message formats that entities must follow to exchange those messages. ISO formulated the OSI model which consists of seven layers of specified protocol standards for network communications software. Defines the electrical and mechanical specifications of the transmission medium and the interface hardware. This layer is responsible for data representation translation between nodes. This layer is responsible for establishing, synchronizing and maintaining communications channels between nodes.
The OSI model has come to be the de facto organizational model for describing protocol layering. Responsible for packing the data from the physical layer into frames. This layer is responsible for routing data between nodes. Additionally, it describes the method for how data is sent and received on the medium. Encryption and compression protocols are usually categorized here.
Readers are encouraged to review the ATM Forum and ITU-TS (formerly CCITT) references for more detailed information about ATM implementation agreements and standards.
Acknowledgments This memo could not have come into being without the critical review from Jim Forster of Cisco Systems, Drew Perkins of FORE Systems, and Bryan Lyles, Steve Deering, and Berry Kercheval of XEROX PARC.
Each layer and sublayer is described in more detail in the following sections.