| Functions
of the ATM layer |
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| 2. |
| 3. |
| 4. |
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| ATM cell
creation => generating and adding a 5 |
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| byte cell
header to the 48 byte payload received |
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| from the AAL
(and giving the payload to the AAL at |
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| the receiving end) |
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| Multiplexing
(and demultiplexing) of the ATM cell |
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| flows from
different sources using appropriate |
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| identifiers (VCI and VPI) located in the cell headers |
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| Cell routing
(switching and/or relaying) within the |
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| ATM network
(also using VCI and VPI) |
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| The ATM layer
may also provide mechanisms for |
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| traffic
management. |
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