aal

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الإنجليزية - الإنجليزية
Asynchronous Transfer Mode Adaption Layer, ATM Adaption Layer
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The Indian mulberry or Noni (Morinda citrifolia, Morinda tinctoria), a shrub found in Southeast Asia ,the East Indies and the Pacific islands as far as French Polynesia
Full Name: Description: ATM Adaptation Layer It has been adopted by the ATM Forum for a class of service called High Speed Data Transfer AAL is a set of standard protocols which translate user traffic into a size and format that can be contained in the payload of an ATM cell (53 bytes) User traffic is returned to its original form at the destination This process is called segmentation and reassembly (SAR) 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 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 Adapation Layer: The standards layer that allows multiple applications to have data converted to and from the ATM cell A protocol used that translates higher layer services into the size and format of an ATM cell
ATM adaptation layer ATM
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 FORE Systems currently supports AAL 5 and AAL 3/4 AAL 3/4 supports connection-oriented VBR data transfer and connectionless VBR data transfer, respectively AAL 5 is defined as Simple and Efficient Adaptation Layer (SEAL)
ATM Adaptation Layer, the element in an ATM network that converts between the source information format (voice, data, video) and ATM cells Also, a protocol layer within ATM that controls the conversion process between the source and destination
ATM Adaptation Layer (ATM) Layer 3 of the ATM architecture In order for ATM to support many kinds of services with different traffic characteristics and system requirements, adapts user traffic (caracterized by different classes of applications) into/from ATM 48-byte payloads The AAL is divided into the Convergence Sublayer (CS) and the Segmentation and Reassembly (SAR) sublayer Four types of AAL were originally recommended by CCITT Two of these have now been merged into one Also, within the past year a fifth type of AAL has been proposed Each is geared to a particular class of traffic, with specific characteristics concerning delay and cell loss All AAL functions occur at the ATM end-station rather than at the switch
A connection made by the AAL between entities in the next higher level
ATM adaptation layer Service-dependent sublayer of the data link layer The AAL accepts data from different applications and presents it to the ATM layer in the form of 48-byte ATM payload segments AALs consist of two sublayers, CS and SAR, AALs differ on the basis of the source-destination timing used, whether they use DBR or VBR, and whether they are used for connection-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
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 AAL is an adaptation layer within the data link layer of the OSI model AAL is divided into a segmentation and reassembly sublayer (SAR) and a convergence sublayer The SAR divides the application datastream into transmit cells and then reassembles the received cells into a datastream that is compatible with the related application The convergence sublayer specifies the requirements for the various types of applications that run over ATM AAL is defined in terms of types, 1 to 5, specified by the type of traffic that it supports Each type offers an appropriate QoS
ATM Adaption Layer
ATM Adaptation Layer In an ATM network, this layer is responsible for the segmentation and reassembly (SAR) of data to fit the fixed-length ATM Cell payloads Different AALs are defined to meet the quality of service (QoS) requirements of the different service types that can be carried on ATM Each AAL is optimized for a particular type of service AAL 1 handles constant-bit-rate (CBR) data AAL 3/4 handles variable-bit-rate (VBR) data transfer, either connection-oriented or connectionless AAL 5 is a simpler alternative to AAL 3/4, used where shared media support and the high level of protection are not required, such as over simple point-to-point links See also SAAL
{i} East Indian small evergreen shrub
Activation Analysis Laboratory of the ES&H Section
ATM Adaptation Layer (AAL) The standards layer that allows multiple applications to have data converted to and from the ATM cell A protocol used that translates higher layer services into the size and format of an ATM cell
ATM Adaptation Layer
The layer in the broadband integrated services digital network protocol hierarchy that adapts user traffic to a cell format
A protocol that translates data into a format that can be interpreted by the ATM Cell
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 One of three layers of the ATM protocol reference model The AAL translates incoming data into ATM cell payloads and translates outgoing cells into format readable by the higher layers Five AALs have been defined: AAL1 and AAL2 handle isochronous (constant bit rate) traffic, such as voice and video, while AAL3/4 and AAL5 apply to data communications through the segmentation and reassembly of packets
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ATM Adaptation Layer The AAL enables engineers to adapt the ATM layer to particular services It 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
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