Classes of Services (AALs)

• Constant Bit Rate (CBR) Services

  • voice or DSn emulation, includes mechanisms for recovering source timing info, ...

• Variable Bit Rate (VBR) Real Time

  • raw compressed (ie bursty) real time video, ...

• Variable Bit Rate (VBR) Non-Real Time

  • multimedia email, ...

• Available Bit Rate (ABR)

  • Web browsing, ...

• Unspecified Bit Rate (UBR)

  • file transfers, ...

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