pxf4333 Infineon Technologies Corporation, pxf4333 Datasheet - Page 117

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

For the definition of the Guaranteed Rate, see
be reduced to the following formulas:
For all connections make sure that no overbooking of the configured scheduler output
rate CCR
For real-time connections, (CBR, rt-VBR)
For non-real-time connections or connections using the WFQ scheduler, additional con-
ditions must be fulfilled.
VBR and UBR+ connections must be setup in per VC queueing configurations, that is,
an empty queue must be found for the connection. The Guaranteed Rate determines the
weight of the queue.
4.2.5.1
As an example, an access network multiplexer is assumed with ADSL lines and an E3
uplink. CBR and UBR+ connections are supported. A minimum Guaranteed Rate of
GR
ularity for higher values.
This behavior is well suited to the Guaranteed Rates which are minimum or sustainable
rates. The values for MCR and SCR will be well below 10 Mbit/s for public networks. In
high speed LANs with high MCR and SCR values, a higher minimum rate could be
selected.
Additionally, it is assumed that three types of line interfaces (PHY) exist in the system:
34 Mbit/s for the uplink, ADSL rates of 8 Mbit/s downstream, and 0.6 Mbit/s upstream.
For each PHY, a maximum possible weight factor 1/n exists: n
= 524, respectively.
Two types of non-real-time connection are defined with Guaranteed Rates of 100 kbit/s
and 20 Kbps with the weight factors 1/n, n
100 Kbps connections would be used for the downstream direction, and the 20 Kbps
connections for the upstream direction.
nections possible on each PHY.
Data Sheet
min
= 19.2 Kbps is selected. This allows GR up to 314.57 Mbit/s with increasing gran-
out
Bandwidth Reservation Example
occurs, i.e.:
å
i
GCR
i
=
CCR
out
Table 4-8
Equation (29)
100
117
= 3146 and n
Table
provides the maximum number of con-
3-24. Mathematically, the CAC can
is the only condition required.
20
= 15730, respectively. The
max
Operational Description
= 9, n
PXF 4333 V1.1
max
= 39, and n
2001-12-17
ABM-3G
(29)
max