Information Technology Reference
In-Depth Information
ATM Cell Format on UNI and NNI
Figure 5-15
UNI
G
F
C
4
P
T
I
3
C
L
P
1
VPI
8
VCI
16
HEC
8
Payload
48 bytes
P
T
I
3
C
L
P
1
VPI
12
VCI
16
HEC
8
Payload
48 bytes
32 bits
8 bits
(CRC)
384 bits
Total cell length 53 bytes (424 bits)
NNI
P
T
I
3
C
L
P
1
VPI
12
VCI
16
HEC
8
Payload
48 bytes
P
T
I
3
C
L
P
1
VPI
12
VCI
16
HEC
8
Payload
48 bytes
32 bits
8 bits
(CRC)
384 bits
Total cell length 53 bytes (424 bits)
GFC (Generic flow control)
VPI (Virtual path identifier)
VCI (Virtual channel identifier)
PTI (Pay load type identifier)
CLP (Cell loss priority)
HEC (Header error control)
Search WWH ::




Custom Search