Atm Protocol

automatic teller PROTOCOL
Contents
Introduction to ATM
communications protocol Reference Model

Physical Layer
Functionalities
Sublayers
communications protocol Specifications

ATM Layer
Functionalities
Sublayers
Protocol Specifications

ATM Adaptation Layer (AAL)
Functionalities
Sublayers
Protocol Specifications

DCW

ATM-Protocol-1

ASYNCHRONOUS TRANSFER MODE
Asynchronous wobble mode (ATM) is a packet electrical switch transfer
mode in which the information is nonionic into cellphones. It is
asynchronous in the sense that the recurrence of cells containing
information from an individualistic user is not necessarily periodic.
ATM is a mode of formatting, multiplexing, transporting and
switching user information in fixed continuance (53 bytes) cells. The user
information may be utter, data, or word picture.
ATM is a connection-oriented technique. In general, signalling and user
information are carried on separate ATM layer connections.

DCW

ATM-Protocol-2

WHY SMALL AND FIX-SIZED CELLS?
The pickaxe of small cells is a compromise between the needs of data
transfer applications and voice.
Data transfer applications are better served with long cells which
reduce the overhead and constitute better bandwidth efficiency. However,
long cells take long time to channel and may suffer larger delay
disagreement.




Voice and video applications quest low delay and low delay variation
(i.e., delay jitter). Thus, voice and video applications prefer small cells.
ATM network has to brave data transfer applications as well as voice
and video applications, and ATM network will operate at high
bandwidth. Thus, the choice is small cells.
Fix-sized cells provide the following advantages:
Less delay variation (i.e., no delay variation due to cell size
variation).
bankrupt and easier cell synchronization.
Easier switch buffer management.
Better fit to self-routing switching mechanism.
The choice of 53 byte cells is a standards-body comprise.
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