PXB4330 Datasheet, PDF (46/201 Pages) Infineon Technologies AG – ICs for Communications

PXB 4330
Functional Description
Scheduler 1
W
F
Q
d
e
m
u
x
Scheduler 48
W
F
Q
Traffic
class 1
Traffic
class 2
Traffic
class 16
Figure 3-9 Queue Grouping
Examples of traffic classes are
• Real-time traffic
• LAN emulation traffic
• Internet (IP) traffic
Figure 3-10 shows an example of threshold configurations for four traffic classes.
Total Buffer Size
VBR PPD = Buffer Size-256
guaranteed 256 cells for real time
ABR PPD
ABR EPD
guaranteed
buffer space
for VBR
new ABR packets are
not accepted
guaranteed
buffer space
for ABR+VBR
UBR PPD
UBR EPD
new UBR packets are not accepted
buffer
fill
4 traffic classes: UBR, ABR, VBR, real time
Figure 3-10 Example of Threshold Configuration
Data Sheet
3-46
09.99