AAL5
Proper noun
Meaning
AAL5
(electronics) Asynchronous Transfer Mode Adaption Layer Type 5, ATM Adaption Layer Type 5.
Examples
AAL2 through AAL4 are used for variable bitrate (VBR) services, and AAL5 for data.
EPD and PPD work with AAL5 connections as they use the end of packet marker: the ATM User-to-ATM User (AUU) Indication bit in the Payload Type field of the header, which is set in the last cell of a SAR-SDU.
RFC 2364 describes Point-to-Point Protocol over ATM (PPPoA) as a method for transmitting PPP over ATM Adaptation Layer 5 (AAL5), which is also a common alternative to PPPoE used with DSL.
Standardized AALs include AAL1, AAL2, and AAL5, and the rarely used AAL3 and AAL4.