| AAL
protocols |
| AAL 1 |
| AAL 2 |
| AAL 5 |
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| Constant bit
rate, small delay, small delay |
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| variation (PCM
speech transport, PDH circuit |
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| emulation) |
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| Variable bit
rate, small delay, small delay |
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| variation
(compressed speech & video |
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| transport) |
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| Variable bit
rate, not time sensitive, no |
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| retransmission
mechanisms (LAN emulation, |
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| IP transport,
signalling transport) |
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