Chapter 2. X.25 Licensed Program Functionality

This chapter discusses the functionality of the X.25 Licensed Program interface. The X.25 Licensed Program provides the following functionality:

• Support of the International Consultative Committee on Telegraph and Telephone (CCITT) 1988 X.25.
• Packet layer programming interface network provider interface (NPI). New programs written to use X.25 should be written to this interface.
• Frame layer programming interface data link provider interface (DLPI). Programs requiring a point-to-point LAP-B connection should use this interface.
• Compatibility application program interface (API) for applications written to the base Version 3 X.25 support.
• Triple-X (X.3, X.28, X.29) Packet Assembler/Disassembler (PAD).
• Support for Transmission Control Protocol/Internet Protocol (TCP/IP) and Systems Network Architecture (SNA) higher layer protocols.
• Simple network management protocol (SNMP) support for data items from the Management Information Base (MIBs) for the packet and frame layers.

Each of these functional areas is covered in more detail in the relevant chapters.