# ATM Adaptation Layer

### From Wikipedia, the free encyclopedia.

In ATM networks, the ATM Adaptation Layer is the point where data is translated into a form that can be segmented and reassembled at the other end. There are four recommended AALs:

- AAL1: used for services like uncompressed video that require a steady bit rate
- AAL2: used for voice traffic tat can handle a variable bit rate
- AAL3/4: used for SMDS packets
- AAL5: used for IP traffic

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Categories: Computer network stubs | Network protocols | ITU-T recommendations

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