Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- initialism electronics Asynchronous Transfer Mode Adaption Layer Type 5,
ATM Adaption Layer Type 5.
Etymologies
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Examples
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A 48 byte MTU is too small, so we use an encapsulation called AAL5, which takes 8 bytes from the last cell in a set, and lets you have up to 65535 bytes of payload.
On PPPoA, PPPoE, ATM and ADSL Farnz 2010
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A 48 byte MTU is too small, so we use an encapsulation called AAL5, which takes 8 bytes from the last cell in a set, and lets you have up to 65535 bytes of payload.
Archive 2010-02-01 Farnz 2010
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So, 100 bytes of payload in AAL5 is carried in 3 cells; the first two cells have 48 bytes each of the payload, and the last cell has 4 bytes of payload, 36 bytes of padding, and 8 bytes AAL5 trailer.
Archive 2010-02-01 Farnz 2010
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This becomes 31 cells carrying 48 bytes of payload each, a cell carrying 44 bytes of payload and 4 bytes padding, and a cell carrying 40 bytes padding and 8 bytes of AAL5 overhead.
Archive 2010-02-01 Farnz 2010
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A 1478 byte MTU, with the 10 bytes of PPP and AAL5 overhead works out to precisely
On PPPoA, PPPoE, ATM and ADSL Farnz 2010
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Two cells contain 48 bytes each of payload, and the last cell contains 40 bytes of padding, and 8 bytes of AAL5 trailer.
Archive 2010-02-01 Farnz 2010
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A 1478 byte MTU, with the 10 bytes of PPP and AAL5 overhead works out to precisely
Archive 2010-02-01 Farnz 2010
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There are two sensible ATM Adaptation Layers for MPEG-2; AAL1, meant for constant bit rate services such as carrying a multiplex from BBC headquarters to the Freeview transmission sites around the country, and AAL5, for services that can cope with a long delay.
How a 1980s telecoms compromise helped set the Bluray video format. Farnz 2010
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It also works well for AAL5; AAL5 uses 8 bytes from every group of up to 1366 cells, leaving 40 bytes in that cell and 48 bytes in the remaining cells in the group for user data; two 188 byte packets plus 8 bytes of AAL5 overhead fit precisely in 8 cells with no padding.
How a 1980s telecoms compromise helped set the Bluray video format. Farnz 2010
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If you're doing PPPoA, this 1502 bytes becomes 31 cells containing 48 bytes of payload, and a cell containing 14 bytes payload, 26 bytes padding, and the 8 byte AAL5 trailer.
Archive 2010-02-01 Farnz 2010
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