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SNA/X.25 Link Overview

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SNA/X.25 Link is composed of only software:

  • SNA Transport

  • Qualified Logical Link Control (QLLC) module

SNA/X.25 Link communicates with the X.25 network through the X.25 System Access software on the HP e3000, which is supported by a Datacommunications and Terminal Controller (DTC). The QLLC module enforces the QLLC protocol, which is a special protocol developed by IBM to resolve differences between SDLC and X.25. It uses qualified X.25 packets to send link control messages in a format similar to SDLC link control messages.

Figure 1-3 "SNA/X.25 Link HP-to-IBM Host Communication" shows how SNA/X.25 Link, the SNA services, and the required NS products implement HP e3000-to-IBM host communication.

Figure 1-3 SNA/X.25 Link HP-to-IBM Host Communication

[SNA/X.25 Link HP-to-IBM Host Communication]

Figure 1-4 "SNA/X.25 Link HP-to-AS/400 Communication" shows how SNA/X.25 Link, the SNA services, and the required NS products implement HP e3000-to-IBM AS/400 communication.

Figure 1-4 SNA/X.25 Link HP-to-AS/400 Communication

[SNA/X.25 Link HP-to-AS/400 Communication]

Host Hardware and Software Requirements

SNA/X.25 Link requires this IBM host hardware:

  • An IBM System/370-compatible mainframe (for example, Model 370, 303x, and 43xx).

  • An IBM 37xx-compatible communications controller that supports an X.25 NCP Packet Switching Interface (NPSI) line.

SNA/X.25 Link requires this IBM host software:

  • MVS/SP or MVS/XA operating system.

  • ACF/NCP network control program.

  • ACF/VTAM telecommunications access method.

  • X.25 NCP Packet Switching Interface (NPSI) software (version 2 release 1 or later for the IBM 3725, and version 3 for the IBM 3745).

For more-specific information, contact your Hewlett-Packard sales representative.

AS/400 Hardware and Software Requirements

SNA/X.25 Link requires this IBM AS/400 hardware:

  • An IBM AS/400 computer system with the appropriate communications controller card installed.

SNA/X.25 Link requires this IBM AS/400 software:

  • OS/400 operating system (all SNA-related software is included within the OS/400 operating system).

For more-specific information, contact your Hewlett-Packard sales representative.

HP e3000 Hardware and Software Requirements

You can run SNA/X.25 Link on any HP e3000 computer that has at least 32MB of real memory. Depending on your system configuration, more memory might be required. Contact your Hewlett-Packard sales representative for more information.

SNA/X.25 Link requires this HP e3000 hardware:

  • A HP e3000 computer system.

  • A block mode terminal that is supported by VPLUS, for use with the Node Management Services (NMS) NMMGR configuration manager.

Note that since SNA/X.25 Link requires the X.25 XL System Access product and the DTC/X.25 Network Access product, the required hardware for those products is also required by SNA/X.25 Link. (See the Getting Started with the DTC manual for more information.)

SNA/X.25 Link requires this HP e3000 software:

  • HP e3000 Multiprogramming Executive with Integrated POSIX (MPE/iX) operating system.

  • NS X.25 System Link.

  • NS X.25 Network Access.

  • OpenView DTC Manager.



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