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# Pre-Installation Tasks

This chapter describes important information that you need to review before installing BEA eLink Adapter for R/3. It includes the following sections:

- System Requirements

- Determining the Installation Node

- TUXEDO Requirements

## System Requirements

This document is validated for the following versions of the layered products:

> Table 1-1 Supported Platforms

Product | Version(s)
--- | ---
SAP R/3 | 3.1H
TUXEDO | 6.4
HP-UX | 10.20, 11.00
Solaris | 2.5, 2.6
AIX | 4.1.4, 4.2.1, 4.3
Windows NT | 4.0 (Service Pack 3)

## Determining the Installation Node

In general, you should install BEA eLink Adapter for R/3 on a node running an R/3 application server:

- Single Node. If the R/3 environment is a single node configuration, then you should install BEA eLink Adapter for R/3 on that node.

- Multiple Nodes. If the R/3 environment is a multiple node configuration, then you should install BEA eLink Adapter for R/3 on one or more of the application servers. BEA eLink Adapter for R/3 must not be installed on the database server.

BEA eLink Adapter for R/3 interacts with R/3 using the SAP RFC library. The RFC library uses IP sockets to communicate with the R/3 application servers. Installing BEA eLink Adapter for R/3 on an R/3 application server node minimizes the risk of failure in this IP socket connection. If BEA eLink Adapter for R/3 is installed on a R/3 application server node, it is recommended that no other TUXEDO applications run on that same node in order to reduce the workload on the node.

However, BEA eLink Adapter for R/3 can be installed on a node other than a R/3 application server. In this situation, the IP socket connection will transparently go across the network to the R/3 application server.

## TUXEDO Requirements

BEA eLink Adapter for R/3 requires that you properly install and configure TUXEDO:

- Installation Node. TUXEDO must be installed on the node running BEA eLink Adapter for R/3. For installation instructions, see the BEA TUXEDO Administrator's Guide for your platform.

- TUXEDO Configuration. After you install BEA eLink Adapter for R/3, you must configure TUXEDO according to the instructions described in Configuring TUXEDO. BEA eLink Adapter for R/3 provides a semi-configured TUXEDO initialization file, which requires only minimal configuration for the TUXEDO environment.

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