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Microsoft's Remote Access Service (RAS) provides TCP/IP over phone lines by treating your modem as a network adapter. TCP/IP applications that run over a network can run over a serial connection. iFIX can use the TCP/IP interface provided by RAS to communicate with other iFIX nodes over asynchronous lines.
RAS client and server software are standard with Windows. In general, a RAS client node dials into a RAS server node. A RAS client can dial in and access resources on a Windows RAS server's network. The Windows software allows multiple RAS clients to be connected simultaneously.
Although RAS allows up to 256 clients to dial into a server simultaneously, the practical limit when RAS is used with the iFIX is significantly less. This is due to the additional resources that iFIX requires to communicate. Each simultaneous connection requires a separate modem on the server. Before you incorporate RAS into your production environment, it is strongly recommended that you test the configuration using multiple connections.
Using iFIX in conjunction with a RAS server provides the following capabilities:
Use the following guidelines when incorporating RAS into your iFIX network:
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