Avaya a500 Guia Do Utilizador

Cajun A500 ATM Switch Overview

Cajun A500 ATM Switch User Guide

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Process Communication

The processes running on the Switch Processor Engine (SWP) communicate via the Inter 

Process Communication mechanism (IPC), provided by pSOS, the real-time operating 

system used on the Cajun A500 SWP. The processes transmit and receive data to and 

from the lower level drivers by registering with the Local Frame Handler layer. 

Figure 1-6 describes the data flow between the software components.

Figure 1-6: Data Flow Between Software Components

pSOSystem Operating System

The pSOSystem operating system is a modular, high-performance, real-time operating 

system designed specifically for embedded microprocessors. It provides a complete 

multi-tasking environment based on Open System standards. The pSOSystem operating 

system is designed for quick start-up on both custom and commercial hardware and is 

supported by an integrated set of cross development tools that can reside on UNIX or 

DOS-based computers. These tools can communicate with a target device over a serial or 

TCP/IP network connection.

pSOSystem Architecture

The pSOSystem operating system employs a modular architecture built around the 

pSOS+ real-time multi-tasking kernel and a collection of companion software 

components. Software components are standard building blocks delivered as absolute, 

position-independent code modules. They are standard parts in the sense that they 

remain unchanged from one application to another. 

Process A

Process B

IPC

Network Protocols

(e.g., TCP/IP, UDP/IP)

SOCKET

SAR

Driver

Ether

Driver

lfTxFrame/lfhISR