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The 8250 chips have 8-bit buffers that are limited to a maximum speed of 9600bps and are typically found in PCs manufactured before 1986 (before the IBM AT).


Starting with the IBM AT, computers have the faster 16450 and 16550 UARTs. These chips use 16-bit buffers and transmit data at a maximum speed of 115,200bps. Any modem faster than 9600bps that will be connected to a PC for remote access requires the use of 16550 UARTs in the PC to get the maximum possible speed. Otherwise, connection speed will be limited to the fastest output speed of the 8250 UART, 9600bps.

Software Requirements


When configuring a workstation for remote access, you must configure the software to recognize the modem in addition to configuring the hardware. In Windows 95/98, you do so using Device Manager (choose Start > Settings > Control Panel > System to open the System Properties dialog box, and click the Device Manager tab). Additionally, you must configure the software to initiate and maintain the connection. This means configuring the dialer software (the client software that uses a local modem to dial the remote access server) and the network protocols that the communications will use, including TCP/IP (Transmission Control Protocol/Internet Protocol), IPX (Internet Packet eXchange), PPP (Point-to-Point Protocol), and PPTP (Point-to-Point Tunneling Protocol). Even if the hardware is configured properly, the software may not initiate a connection.


You can configure remote access from Windows 95/98/NT workstations using the built-in Dial-Up Networking software.


Remote Access Connection Methods


^^ecause a computer using remote access is not connected to your network, it will not use LAN technologies to connect to the network. The remote computer will instead use connection methods to connect to the LAN, including:

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