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1 Introduction

CommPlete Communications Server 5

The client PC operates with the MCSIWSN redirector for DOS or the WinMCSI

director for Windows. To use the LAN version of a communications program, MCSI

must be installed to redirect data to the LAN instead of to the client PC’s serial port.

Any LAN communications program with the MCSI-compatible INT6B ACS API,

such as NASI™ or NCSI™, can operate with the RASExpress server.

A client PC can also dial out using an IP protocol such as Telnet. Before the client can

dial out, however, the user must load TCP/IP and have the TCP/IP protocol config-

ured for the IP router address, which is the local IP address of the RASExpress server.

RASExpress Dial-Out and Dial-In Operation

Dial-in and dial-out asynchronous communications is the transmission of data over a

LAN to and from remote sites via asynchronous gateways. Most gateways perform

only dial-in or dial-out functions, but not both. In contrast, the RASExpress server

provides high speed dial-in and dial-out capabilities with the added benefits of eco-

nomical modem pooling and shared phone lines.

Dial-Out Operation

To dial out, the user can use either Telnet or MCSI. To use Telnet, or to use MSCI on

some networks, the user must first load TCP/IP. To use MCSI, the user must log on

to the LAN and run MCSIWSN for DOS or WinMCSI for Windows from the client

PC. (To use WinMSCI on some networks, the user must first load IPX.) Then the user

must log on to the RASExpress server using the assigned user name and password.

Running a data communications program then allows the selection of an available

outbound modem. The outbound modem operates as if it were directly connected to

the client PC. Modem configurations can be changed, terminal emulation performed,

and files transferred. When data is sent from the client PC to the modem, the transfer

begins with the communications software, which sends asynchronous data to the

redirector, which then sends it to the client PC’s NIC. There it is converted to packets

and addressed to the RASExpress server. The data is received at the RASExpress

server’s network interface and sent to the RASExpress software. The software sends it

to the modem card, where it is converted back to asynchronous data and sent to the

selected modem.

Remote Control Dial-In Operation

Before a remote user can dial in, a client PC on the LAN must be set up for remote

computing. To do this from a DOS client PC, run the MCSI redirector by typing

MCSIWSN -I. From a Windows client using ComMap for Windows, select Port Type

for the port number and select Inbound. Then log on to the RASExpress server, using

the assigned user name and password, and run the host portion of the communication

software (such as pcANYWHERE

) that is installed on the client PC. The RASExpress

Connection Manager monitors all inbound lines for an incoming call, and connects the

remote user with the host PC that the user selects from the Connection Manager list.

The remote caller runs the remote portion of the communications software, dials in to

one of the assigned RASExpress server modems, and receives the List of Hosts

screen, which requests a valid user name and password. The caller is then connected

to the client PC and the remote communications session begins.

As part of the inbound operation, the inbound modem sends asynchronous data to

the server. The RASExpress then sends the data to the RASExpress server’s network

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Multitech MT5634HD16 Guía de usuario Pagina 15

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