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- ATM_adaptation_layer abstract "The use of Asynchronous Transfer Mode (ATM) technology and services creates the need for an adaptation layer in order to support information transfer protocols, which are not based on ATM. This adaptation layer defines how to segment and reassemble higher-layer packets into ATM cells, and how to handle various transmission aspects in the ATM layer.Examples of services that need adaptations are Gigabit Ethernet, IP, Frame Relay, SONET/SDH, UMTS/Wireless, etc. only optical fibers can be used.The main services provided by AAL (ATM Adaptation Layer) are:Segmentation and reassemblyHandling of transmission errorsHandling of lost and misinserted cell conditionsTiming and flow controlThe following ATM Adaptation Layer protocols (AALs) have been defined by the ITU-T. It is meant that these AALswill meet a variety of needs. The classification is based on whether a timing relationship must be maintained between source and destination, whether the application requires a constant bit rate, and whether the transfer is connection oriented or connectionless. AAL Type 0 (also referred as raw cells) consists of 48 bytes of payload without any reservation for special fields.AAL Type 1 supports constant bit rate (CBR), synchronous, connection oriented traffic. Examples include T1 (DS1), E1, and x64 kbit/s emulation.AAL Type 2 supports time-dependent Variable Bit Rate (VBR-RT) of connection-oriented, synchronous traffic. Examples include Voice over ATM. AAL2 is also widely used in wireless applications due to the capability of multiplexing voice packets from different users on a single ATM connection.AAL Type 3/4 supports VBR, data traffic, connection-oriented, asynchronous traffic (e.g. X.25 data) or connectionless packet data (e.g. SMDS traffic) with an additional 4-byte header in the information payload of the cell. Examples include Frame Relay and X.25.AAL Type 5 is similar to AAL 3/4 with a simplified information header scheme. This AAL assumes that the data is sequential from the end user and uses the Payload Type Indicator (PTI) bit to indicate the last cell in a transmission. Examples of services that use AAL 5 are classic IP over ATM, Ethernet Over ATM, SMDS, and LAN Emulation (LANE). AAL 5 is a widely used ATM adaptation layer protocol. This protocol was intended to provide a streamlined transport facility for higher-layer protocols that are connection oriented.AAL 5 was introduced to:reduce protocol processing overhead.reduce transmission overhead.ensure adaptability to existing transport protocols.The AAL 5 was designed to accommodate the same variable bit rate, connection-oriented asynchronous traffic or connectionless packet data supported by AAL 3/4, but without the segment tracking and error correction requirements.".
- ATM_adaptation_layer wikiPageExternalLink www.atmforum.com.
- ATM_adaptation_layer wikiPageExternalLink www.itu.int.
- ATM_adaptation_layer wikiPageID "649316".
- ATM_adaptation_layer wikiPageLength "4055".
- ATM_adaptation_layer wikiPageOutDegree "14".
- ATM_adaptation_layer wikiPageRevisionID "651587689".
- ATM_adaptation_layer wikiPageWikiLink ATM_Adaptation_Layer_1.
- ATM_adaptation_layer wikiPageWikiLink ATM_Adaptation_Layer_2.
- ATM_adaptation_layer wikiPageWikiLink ATM_Adaptation_Layer_5.
- ATM_adaptation_layer wikiPageWikiLink Asynchronous_Transfer_Mode.
- ATM_adaptation_layer wikiPageWikiLink Category:ITU-T_recommendations.
- ATM_adaptation_layer wikiPageWikiLink Category:Network_protocols.
- ATM_adaptation_layer wikiPageWikiLink Frame_Relay.
- ATM_adaptation_layer wikiPageWikiLink Gigabit_Ethernet.
- ATM_adaptation_layer wikiPageWikiLink ITU-T.
- ATM_adaptation_layer wikiPageWikiLink Internet_Protocol.
- ATM_adaptation_layer wikiPageWikiLink Segmentation_and_Reassembly.
- ATM_adaptation_layer wikiPageWikiLink Synchronous_optical_networking.
- ATM_adaptation_layer wikiPageWikiLink Universal_Mobile_Telecommunications_System.
- ATM_adaptation_layer wikiPageWikiLinkText "AAL".
- ATM_adaptation_layer wikiPageWikiLinkText "AALC".
- ATM_adaptation_layer wikiPageWikiLinkText "ATM adaptation layer".
- ATM_adaptation_layer wikiPageUsesTemplate Template:Refimprove.
- ATM_adaptation_layer wikiPageUsesTemplate Template:Reflist.
- ATM_adaptation_layer subject Category:ITU-T_recommendations.
- ATM_adaptation_layer subject Category:Network_protocols.
- ATM_adaptation_layer type Protocol.
- ATM_adaptation_layer type Redirect.
- ATM_adaptation_layer comment "The use of Asynchronous Transfer Mode (ATM) technology and services creates the need for an adaptation layer in order to support information transfer protocols, which are not based on ATM. This adaptation layer defines how to segment and reassemble higher-layer packets into ATM cells, and how to handle various transmission aspects in the ATM layer.Examples of services that need adaptations are Gigabit Ethernet, IP, Frame Relay, SONET/SDH, UMTS/Wireless, etc.".
- ATM_adaptation_layer label "ATM adaptation layer".
- ATM_adaptation_layer sameAs Q299031.
- ATM_adaptation_layer sameAs ATM_Adaptation_Layer.
- ATM_adaptation_layer sameAs ATM_Adaptation_Layers.
- ATM_adaptation_layer sameAs ATM_適合層.
- ATM_adaptation_layer sameAs ATM_적합_계층.
- ATM_adaptation_layer sameAs ATM_Adaptation_Layers.
- ATM_adaptation_layer sameAs m.02_h0j.
- ATM_adaptation_layer sameAs AAL.
- ATM_adaptation_layer sameAs Q299031.
- ATM_adaptation_layer wasDerivedFrom ATM_adaptation_layer?oldid=651587689.
- ATM_adaptation_layer isPrimaryTopicOf ATM_adaptation_layer.