SNAX/XF LU Network Services Manual

1 Introduction to LUNS
097841 Tandem Computers Incorporated 1–1
As a component of the SNAX/XF service manager, SNAX/XF LU Network Services
(LUNS) provides Tandem users a way of handling system requests with the
functionality normally found in System Network Architecture (SNA) environments.
This manual discusses LUNS from both a conceptual and a practical point of view by:
Giving you a general overview of how LUNS works
Explaining the preparatory steps you must take to use LUNS
Showing, through an application example, how to create the configuration tables
necessary for LUNS operation
What LUNS Does LUNS allows SNA users on a Tandem system to access processes that run on:
That particular Tandem system
Other Tandem systems within an Expand network
An IBM or equivalent host system. (Note that throughout this manual, host and
host system mean an IBM system or its equivalent.)
LUNS provides for:
Unsolicited logons. Users can start or stop a TACL process or Pathway
application by entering character-coded commands. Also, character-coded
commands can be used to log on to a host application.
For intelligent devices (such as automated teller machines) that use
SNA-formatted INIT-SELF and TERM-SELF requests, LUNS allows for unsolicited
logons to host programs without having to modify the INIT-SELF request.
Environment switching. LUNS allows environment switching without a system
operator’s intervention. For example, using character-coded commands, a
terminal user can log on to a host program, log off, and then log on to a Tandem
program–or do the reverse-without having to know where in the network the
programs are located.
Message display. Users can retrieve and display predefined user and system
messages at the terminal device.
Menu instruction. The ability of LUNS to display messages and other information
allows the use of menus for providing instructions to the terminal user.