SNA IMF/XL Node Manager's Guide (30293-90010)

1 SNA IMF Overview

Systems Network Architecture Interactive Mainframe Facility (SNA

IMF) emulates the major features of an IBM 3270 control unit, using

the protocols of a Node Type 2.0 and Logical Unit Types 1, 2, and 3

(LU.T1, LU.T2, and LU.T3). SNA IMF supports interactive

communication between an HP 3000 and an IBM host. The host can be

an IBM System/370-compatible mainframe (for example, Model 370,

303x, or 43xx), an IBM System/36 or System/38, or an IBM AS/400.

If the HP 3000 will communicate with an IBM mainframe, it must be

connected to an IBM 37xx-compatible communications controller that

supports an SNA line. An HP 3000 can also be connected to the

communications controller via an IBM 3710 network controller. The

host must use an IBM operating system with the Virtual

Telecommunications Access Method (VTAM) and must support remote

IBM 3270 control units.

SNA IMF uses one of these SNA link products:

• SNA/SDLC Link: A bundled hardware and software product that

supports a logical and physical connection to an SNA network.

• SNA/X.25 Link: A software product that communicates with the

X.25 network through the X.25 XL System Access software on the

HP 3000.

SNA IMF and the SNA link form an HP 3000 subsystem that emulates

the IBM 3270 control unit in an SNA network.

Figure 1-1 shows the different LU types that SNA IMF can implement.

Figure 1-1 HP 3000-to-IBM Communication