RS8234 Просмотр технического описания (PDF) - Conexant Systems

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RS8234

ServiceSAR Controller

Conexant Systems 

ABR Traffic Management

The ABR flow control manager dynamically rate-

shapes ABR traffic independently per VCC, based

upon network feedback. One or more ABR templates

are used to govern the behavior of traffic. Both

relative rate (RR) and explicit rate (ER) algorithms

are employed when computing a rate adjustment on

an ABR VCC. Programmable ABR templates allow

rate-shaping policies on groups of VCCs to be tuned

for different network applications. The RS8234

automatically generates and processes all resource

management (RM) cells. The on-chip hardware,

coupled with the user-defined ABR templates,

implements all required source and destination

behaviors as defined in T.M. 4.1. Optional behaviors

such as use-it-or-lose-it, out-of-rate RM cells, host

congestion and allowed cell rate (ACR) monitoring

are also supported.

Early Packet Discard for Frame Relay

and LAN Emulation

The early packet discard (EPD) feature provides

a mechanism to discard complete or partial CPCS-

PDUs based upon service discard attributes or error

conditions. For example, the reassembly coprocessor

performs EPD functions for the following conditions:

Frame Relay packet discard based on the discard

eligibility (DE) field in the received frame and the

channel exceeding a user-defined priority threshold;

LANE-LECID packet discard to implement echo

suppression on multicast data frames on ELAN

channels; and for errors like receive FIFO full

condition/threshold and various AAL3/4 MIB errors.

Figure 1. RS8234 functional block diagram

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