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ATM Adaptation Layer


(ATM Adaption Layer) The part of the ATM protocol that breaks up application packets into 48-byte payloads that become ATM cells when the 5-byte headers are attached. The AAL resides between the higher layer transport protocols and the ATM layer. The AAL comprises two layers: Convergence Sublayer (CS) and Segmentation & Reassembly Sublayer (SAR). There are four types of AALs, which are summarized below. See ATM.

AAL-1 Connection-oriented, Constant Bit Rate (CBR), such as DS1 and DS3.

AAL-2 Connection-oriented, Variable Bit Rate (VBR).

AAL-3/4 Connection-oriented and connectionless, Available Bit Rate (ABR).

AAL-5 Connection-oriented, Unspecified Bit Rate (UBR). Least amount of error checking and retransmission.

AAL-6 Connection-oriented, MPEG-2 video streams.

ATM Adaption Layer
The SSCS is a service dependent layer, while the CPCS provides common functions such as CRC checking and padding to fill out a 48-byte payload. The SAR converts the output of the CS into cells for the ATM layer.
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For a punt today take Aalen to earn a positive result at a Sandhausen side who were out of their depth last term, conceding 66 goals and winning six matches, but were saved from relegation when MSV Duisburg were denied a licence to play in Bundesliga 2.
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Martinez missed out on a hat-trick in City's 6-0 win over SV Neusorg on Monday night and was today waiting to see if he will feature against tougher opposition in tonight's game against VFR Aalen of the German third division (7pm).
But the player-manager has already penciled himself in for tomorrow's second fixture against VFR Aalen who narrowly missed out on promotion from the German third division last season, when he will link up with the impressive Youssef Safri in the heart of the midfield for the first time.