89TTM553

`  Deterministic performance at 10 Gbps wire-speed (35Mcps) regardless of the number of flows, traffic size, and patterns.
`  Up to 256 megabytes of external memory buffer space (equivalent to a 210ms buffer at 10 Gbps).
`  Support (Rx and Tx) for industry-standard SPI-4 phase 2, NPF Streaming Interface, and CSIX over LVDS.
`  Hierarchical queuing and precise scheduling:
Traffic management flexibility.
Support for up to 4K aggregate flow queues (AFQs), 1K port queues (PQs), 2K arrival reassembly queues (ARQs), and 1K output queues/channels (OQs) with no external memory required. Configurable AFQ-to-port assignments.
Support for up to 1M discrete flows (FLQs), with queuing for each flow, using external memory. Configurable mapping of
FLQs into aggregate flow queues.
Two-level FLQ scheduling mode that supports up to 128K or 256K virtual pipe or subscriber queues with up to 8 or 4 CoS
priority queues each.
Accurate byte-rate shaping at the FLQ, AFQ and port levels.
`  Multiple levels of buffer congestion management.
Hierarchical queue structure and thresholding.
Congestion indication.
Dynamic adjustment of thresholds during periods of congestion.
Packet discard (PD).
Weighted random early discard (WRED).
Local congestion indication (CI).

The 89TTM553 is a flow-based traffic management co-processor that can be used in conjunction with the 89TTM552.

89TTM553 has two major functional parts: the queue manager (QM) and the FLQ scheduler. The QM is responsible for all the non-bandwidth functions, which include managing up to 1 Million queuing structures, handling cell and packet arrivals and departures from these queues, and maintaining a database of congestion management and statistics parameters for each flow queue (FLQ). The FLQ scheduler of 89TTM553 is responsible for managing the FLQ bandwidth functions.

The 89TTM553 FLQ scheduler supports traffic scheduling on up to 1M discrete flows. In addition to the scheduling levels provided by the 89TTM552, the 89TTM553 provides one or two levels of additional scheduling hierarchy. It also provides guaranteed minimum rate, maximum rate capping, excess rate distribution using weighted fair queuing (WFQ), byte rate shaping, and dynamic configuration adjustments.

The 89TTM553 stores all the flow-based parameters (and state information) that are made available to the 89TTM552 for flow-based processing. When the 89TTM553 is used with the 89TTM552, congestion and bandwidth management features are enabled at the flow level as well as at the aggregate-flow level.