PXF4333 Datasheet, PDF (65/361 Pages) Infineon Technologies AG – ABM 3G ATM Buf fer Manager

ABM-3G
PXF 4333 V1.1
Functional Description
• DH
Delta Hysteresis is a traffic class specific factor applied to all maximum thresholds.
The description of the hysteresis mechanism in Section 3.4.1.6.5 provides the
details.
3.4.1.3.2 Backpressure Thresholds
• UTOPIA Backpressure Thresholds
These thresholds (four in upstream and four in downstream direction) are global
thresholds with respect to the cell buffer fill level and result in backpressure of specific
port groups of the respective UTOPIA receive interface.
3.4.1.4 Counter Classification
The ABM-3G Buffer Manager contains the following counter types
• Occupancy Counters
These counters reflect the current buffer state and are basic elements in discard,
congestion indication and backpressure mechanisms.
• Statistics Counters
These counters are used for measurements and statistics. Refer also to
Chapter 3.4.1.8.
3.4.1.5 Threshold and Occupancy Counter Overview
Table 3-17 summarizes thresholds and occupancy counters used by the Cell
Acceptance Algorithm. The thresholds are grouped by logical buffer view. For each
arriving cell, all conditions in this table are checked. Several thresholds may be
exceeded at the same time. Therefore, the table is not a truth table.
Data Sheet
65
2001-12-17