pxf4333 Infineon Technologies Corporation, pxf4333 Datasheet - Page 80

• Manufacturer Part Number: pxf4333
• Description: Abm 3g Atm Buf Fer Manager
• Manufacturer: Infineon Technologies Corporation

Figure 3-25 Scheduler Behavior Example
The three columns in
the scheduler load as seen from Connection Acceptance Control (CAC). New connec-
tions are accepted as long as their guaranteed rates fit the spare bandwidth of the
scheduler. The center column shows the case in which all Queues 2..10 are filled; that
is, all non-real-time connections are sending data. The total non-real-time bandwidth, in-
cluding the spare bandwidth, is then distributed to the 9 queues according to their weight.
In this case, two weight factors are defined. Queue 6 has weight of 1, others have weight
of 10. The right column shows the case of only three queues (6, 7 and 9) filled; all other
connections are not sending data at this time. Again, the available bandwidth is fairly dis-
tributed among the queues, still conserving the 1:10 ratio defined by their weights.
Notice that bandwidth of the real-time connections is not affected by bandwidth re-ad-
justments; but, remains constant over time under the assumption that real-time
connections are constantly sending data. If, however, a real-time connection should not
use its bandwidth, the bandwidth would be used immediately by the non-real-time con-
nections. The behavior of the WFQ scheduler shown in
connections has advantages for both the network operator and for the end user:
• The available bandwidth is always used completely, resulting in optimum usage of
• A user paying for a higher guaranteed rate also obtains higher throughput under all
Data Sheet
transmission resources.
load conditions.
Band width n ot reserved
connection setup
with guaranteed
10
6
5
4
3
2
cell rates
9
8
7
1
Figure 3-25
not reserved
bandwidth
distributed
1 0
6
1
9
8
7
describe different conditions: The left column shows
80
distributed
bandwidth
unused
9
7
6
1
Figure 3-25
real-time
Functional Description
traffic
scheduler
output rate
PXF 4333 V1.1
for non-real-time
2001-12-17
ABM-3G