the AAL divides the user information into segments suitable for packaging into a series of ATM cells. AAL1 is typically used for CBR traffic such as voice and real time video, while AAL5 is typically used for VBR and VBR traffic such as bursty LAN data.

ATM Adaption Layer. The AAL enables engineers to adapt the asynchronous transfer mode layer to particular services. Lies between the ATM layer and the higher layers and maps or adapts the functions or services of the higher layers onto a common ATM bearer service.

AAL converges packets from upper layers into ATM cells as defined by ITU-T, ETSI and the ATM Forum. AAL has several service types and classes of operation to accommodate different types of classes.

See Asynchronous Transfer Mode Adaption Layer

A collection of standardized protocols that adapt user traffic to the cell format. The AAL is subdivided into the Convergence Sublayer (CS) and the Segmentation and Reassembly (SAR) sublayer. There are several types of AALs (AAL1, AAL2, AAL3/4 and AAL5) to support the various AAL service classes.

ATM Adaptation Layer. The part of the ATM protocol that breaks up application data packets into ATM cells. There are six ATM adaptation layers:AAL-1: Constant Bit Rate (CBR)AAL-2: Variable Bit Rate (VBR)AAL-3/4: Available Bit Rate (ABR)AAL-5: Unspecified Bit Rate (UBR)AAL-6: MPEG-2.

ATM Adaptation Layer. A protocol layer that segments incoming data into ATM cells.

ATM Adaptation Layer. Where non-ATM data is converted to ATM format by filling the 48-byte fixed-length cells at the UNI. Forms the top layer of the ATM version of the BISDN protocol stack. AAL is divided into two sublayers: Convergence Sub-layer and Segmentation and Reassembly Sub-layer.

ATM adaption layer. Service-dependent sublayer of the data link layer. The AAL accepts data from different applications and presents it to the ATM layer in fhe form of 48-byte ATM payload segments. AALs consist of two sublayers, CS and SAR. AALs differ on the basis of the source-destination tuming used, whether they use CBR or VBR, and whether they are used for connecion-oriented or connectionless mode data transfer. At present, the four types of AAL recommended by the ITU-T are AAL1, AAL2, AAL3/4, and AAL5.

ATM Adaptation Layer AB

ATM Adaptation Layer, the interface layer between services and ATM.

ATM Adaptation Layer. A collection of standardised protocols that adapts user traffic to a cell format. The AAL is divided into the Convergence Sublayer (CS) and the Segmentation and Reassembly (SAR) sublayer.

ATM Adaptation Layer. The AAL translates digital voice, image, video, and data signals into the ATM cell format, and vice versa. There are five AALs defined (AAL1 through AAL5) that provide different services. For example, AAL5 supports connection-oriented variable bit rate data services.

ATM Adaption Layer (Layer of Adaptation ATM) Collection of standardized protocols that adapts the traffic of user to a format of cells. The AAL is divided in the Sub-layer of Convergencia (CS) and in the Sub-layer of Segmentacio'n and Re-ensambe (SAR).

The layer of the ATM protocol that adapts different telecommunications service requirements to the ATM network.

ATM Adaptation Layer The interface between services, such as voice, and the internal ATM switching protocol. ATM Forum A technical group, mainly of network equipment vendors, with the mission of setting pragmatic standards for ATM (Asynchronous Transfer Mode) communication systems.

The ATM adaption layer is an end-to-end process used only by the two communicating entities to insert and remove data from the ATM layer. At every point in the network, processing is done only on each ATM cell in isolation. At no point is it necessary to gather more information than is contained in a single cell header to complete the process. The network is not concerned with arrivals of groups of cells, sequencing or acknowledgment. The AAL enhances the service provided by the ATM layer to a level required by the next highest layer.

ATM Adaptation Layer. Format for sending packets on a ATM network.

ATM adaptation layer. A set of standard protocols that translate user traffic into a size and format that can be contained in the payload of an ATM cell. User traffic is returned to its original form at the destination. This process is called segmentation and reassembly. All AAL functions occur at the ATM end-station rather than at the switch.

the AAL divides the user information into segments suitable for packaging into a series of ATM cells. There are several types of AALs in use.

ATM adaptation layer. A series of protocols enabling various types of traffic, including voice, data, image, and video, to run over an ATM network.

ATM adaptation layer. The layer in the ATM model that provides the protocol between packet services and any ATM cell-oriented switching devices.

ATM adaptation layer. The layer of the ATM protocol stack that parses data into the payload portion of the ATM cell for transport across an ATM network. See also: Asynchronous Transfer Mode (ATM)