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8
7
GFC
GFC
VPI
VCI
8
7
VPI
VCI
GFC: Generic Flow Control
VCI: Virtual Channel Identifier
VPI: Virtual Path Identifier
Figure 5-1. UNI and NNI Cell Structure Differences
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Configuring for ATM Network Testing
BIT
6
5
4
VCI
PT
HEC
Data
(48-byte payload)
ATM UNI Cell Structure
BIT
6
5
4
VPI
VCI
PT
HEC
Data
(48-byte payload)
ATM NNI Cell Structure
CLP: Cell Loss Priority
PT: Payload Type
HEC: Header Error Control
Other ATM Configuration Options
3
2
1
1
VPI
VCI
2
3
4
CLP
5
3
2
1
1
VCI
2
3
CLP
4
5
5
O
C
T
E
T
O
C
T
E
T
za076f.eps
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