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Configuring for ATM Network Testing
Other ATM Configuration Options
5
5-23
8 7 6 5 4 3 2 1
BIT
GFC
VPI
VCI
VCI
HEC
Data
(48-byte payload)
VPI
VCI
PT
CLP
ATM UNI Cell Structure
1
2
3
4
5
O
C
T
E
T
1
2
3
4
5
GFC
8 7 6 5 4 3 2 1
BIT
VPI
VCI
VCI
HEC
Data
(48-byte payload)
VPI
VCI
PT
CLP
ATM NNI Cell Structure
GFC: Generic Flow Control
VCI: Virtual Channel Identifier
VPI: Virtual Path Identifier
CLP: Cell Loss Priority
PT: Payload Type
HEC: Header Error Control
O
C
T
E
T
za076f.eps
Figure 5-1. UNI and NNI Cell Structure Differences
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