PXB4330 Datasheet, PDF (53/201 Pages) Infineon Technologies AG – ICs for Communications

PXB 4330
Operational Description
4.5.1 ABM Configuration Example
In this section, a popular mini-switch scenario (Figure 4-2) is used to describe the most
important points for the software configuration of the ABM. Among other things, the fol-
lowing fixed assignments can be made in software by the user:
• Assignment of Schedulers to PHYs and programming of Scheduler output rates
• Definition of the necessary traffic classes
• Assignment of the queues to the traffic classes
• Assignment of the queues (QIDs) to the Schedulers (SIDs)
Assignment of Schedulers and Programming Output Rates:
The ABM has 96 Schedulers (48 in the upstream direction and 48 in the downstream di-
rection). Each ADSL device is assigned to a separate Scheduler (this guarantees each
ADSL device a 6-Mbit/s data throughput without bandwidth restrictions caused by the
other ADSL devices); then, 95 ADSL devices can be connected. The 96th Scheduler will
be occupied by the E3 uplink to the public network. The assignment of the Schedulers
to the PHYs is totally independent and even such a strong asymmetrical structure as in
(Figure 4-2) can be supported. The output rates of the Schedulers must be programmed
in such a way that the total sum does not exceed 622 Mbit/s (payload rate). From the
example, the following result is derived: 95 x 6 Mbit/s + 1 x 34 Mbit/s = 604 Mbit/s ≤ 622
Mbit/s.
#1 _ADSL
#2 _ADSL
#95 _ADSL
34 Mbps
Uplink
Multiplex
Network
6 Mbps
6Mbps
ALP
UTOPIA
E3
6Mbps
34Mbps
ABM
#1
#2
Uni-dir-
ectional
Mode
#95
#96
= Scheduler, used as virtual PHYs (≠ UTOPIA PHYs)
Figure 4-2 ABM Application Example: DSLAM
Data Sheet
4-53
09.99