| ATM
cell header structure |
| Bits |
| 8 |
| 7 |
| 6 |
| 5 |
| 4 |
| 3 |
| 2 |
| 1 |
|
|
| Byte in |
|
| header |
|
| GFC* / VPI |
| VPI |
| VPI |
| VCI |
| VCI |
| VCI |
| PTI |
| CLP |
| HEC |
|
|
|
|
| GFC Generic Flow Control
HEC Header Error Control |
|||
| VPI Virtual Path Identifier
PTI Payload Type Indicator |
|||
| VCI Virtual Channel Identifier CLP Cell Loss
Priority |
|||
| * GFC at User to Network
Interface (UNI) |
|||