Metraipolis › archive › dc_2d6830389db7

ATM Adaptation Layer 5 — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/ATM_Adaptation_Layer_5
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-07T01:12:57.989Z
SHA-256 of the archived text: b90a7d2201509622177241d6d87c7c3162c8e10a67fe335c43268748b66679bf
Stable URL of this page: https://metraipolis.com/documento/dc_2d6830389db7

How to cite

ATM Adaptation Layer 5 — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/ATM_Adaptation_Layer_5 (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_2d6830389db7 (Metraipolis archive dc_2d6830389db7, sha256 b90a7d2201509622177241d6d87c7c3162c8e10a67fe335c43268748b66679bf)

BibTeX

@misc{dc2d6830389db7,
  title = {ATM Adaptation Layer 5 — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/ATM_Adaptation_Layer_5},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_2d6830389db7; sha256 b90a7d2201509622177241d6d87c7c3162c8e10a67fe335c43268748b66679bf},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/ATM_Adaptation_Layer_5. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

ATM Adaptation Layer 5 (AAL5) is an ATM adaptation layer used to send variable-length packets up to 65,535 octets in size across an Asynchronous Transfer Mode (ATM) network. Unlike most network frames, which place control information in the header, AAL5 places control information in an 8-octet trailer at the end of the packet. The AAL5 trailer contains a 16-bit length field, a 32-bit cyclic redundancy check (CRC) and two 8-bit fields labeled UU and CPI that are currently unused. Each AAL5 packet is divided into an integral number of ATM cells and reassembled into a packet before delivery to the receiving host. This process is known as Segmentation and Reassembly (see below). The last cell contains padding to ensure that the entire packet is a multiple of 48 octets long. The final cell contains up to 40 octets of data, followed by padding bytes and the 8-octet trailer. In other words, AAL5 places the trailer in the last 8 octets of the final cell where it can be found without knowing the length of the packet; the final cell is identified by a bit in the ATM header (see below), and the trailer is always in the last 8 octets of that cell.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «ATM Adaptation Layer 5» — https://en.wikipedia.org/wiki/ATM_Adaptation_Layer_5
Wikidata Q2819544: «ATM adaptation layer» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q2819544
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/ATM_Adaptation_Layer_5?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1230217598, consultata il 2026-11-07T01:09:22.054Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 8d3768fe0484ce1ca9d2f7667e1279ef145446fa2e5ac38bae92ca9f2df287c7