How to Install TP4 Components on Windows NT 4.0

   \DRVLIB\PROTOCOL\TP4SETUP
				

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To install these files, you must do the following:

1. If you already have TP4 installed and are upgrading from Windows NT 3.51, then you must remove and re-install the TP4 components from the Windows NT 4.0 compact disc. The version of TP4 that was shipped with Windows NT 3.51 will not work on Windows NT 4.0, and the Windows NT upgrade process will not upgrade the TP4 components automatically.
   
   To remove TP4 use the Network applet within the Control Panel. Select TP4 from the list of protocols and then select Remove. You should re-boot after performing this removal process.
2. The TP4 files can be found on the compact disc in the following path drvlib\protocol\tp4setup. Within this directory path there are subdirectories for the processor type of your server.
   
   To install the new version of TP4 you should open the network applet within the Control Panel. Select the Protocols tab and then the Add button. Next select the Have Disk button, and you will get a dialog box requesting a path to the installation point. Enter the path to the appropriate subdirectory on the Windows NT compact disc for your processor type.
3. You will see a dialog box with the driver ISO TP4/CLNP Stack selected. Select the OK button.
4. You will now be returned to the Network Control Panel applet on the Protocols tab. TP4 should now appear on the list of installed protocols.
5. Select Close to complete the installation process. During the close down process, you will be given TP4 configuration options. Select the proper Local Address and NSAP address for your configuration and then select the OK button.
6. Re-start the server when requested. Upon re-start the TP4 stack will be installed and available for use.

The NT ISO TP4 stack is bound to the Streams environment. TP4 is a Streams driver that does not export TDI at its upper edge nor NDIS at its lower edge. Instead, it exports the AT&T "Transport Provider Interface" (TPI) at its upper edge, and the "Data Link Provider Interface" (DLPI) at its lower edge. The NT Streams environment includes facilities to convert TDI primitives to equivalent TPI primitives at the upper edge, and DLPI primitives to NDIS primitives at the lower edge.

It is not possible to communicate via NetBios over TP4. You can only communicate with TP4 via the Windows Sockets (WinSock) API based on the Berkeley Sockets programming model.

Also it is not possible to communicate with TP4 over X25. In the OSI reference model, there are two lower-layer stacks: LAN (CLNP) and WAN (X.25). CLNP is used in the LAN environment because it does not do any error checking and relies on TP4 to do the end-to-end error checking. X.25 is the layer that does all the error checking so that any error is caught before it reaches its destination. TP4 relies on CLNP and may not rely on TP0/X.25.

TP4 includes the following features:

• Uses CLNP network service provider based on ISO 8473
• Provides guaranteed reliable delivery of packets using sequence numbers
• Ensures data integrity by using checksums
• Re-transmits corrupted or lost packets