CHAPTER 29

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1. Type 1 ATM adaptation layer is used for supporting real-time voice communication and video conferencing.

2. You can obtain the details at http://www.cisco.com and http://www.nortelnetowrks.com.

3. To support voice services with 64kbps PCM over ATM, Type 1 AAL protocol is used.

4. Type 2 AAL is used for variable rate video transmission. For fixed rate transmission, Type 1 AAL is used.

5. The ATM cell has 53 bytes, out of which 5 bytes contain the header information. Hence, the overhead is 5/53 or about 10%.

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