| VPI
and VCI |
|
|
|
|
|
| VPI and VCI are
virtual |
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| connection identifiers |
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| (used for
switching or |
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| relaying the
cells to the |
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| correct destination) |
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|
|
|
|
|
|
|
| Physical |
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| layer |
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| connection |
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| (e.g.
STM-1) |
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| VPI 1 |
| VPI 2 |
|
|
|
| Multiplexing |
||
| in
AAL 2 |
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