SNAX/XF LU Network Services Manual

Creating the Basic Configuration
Application Example
3–2 097841 Tandem Computers Incorporated
Operational Assumptions The following are operational assumptions:
Only two terminals on \SYS1 will use LUNS. While other SNA terminals might
be connected to \SYS1, they will remain unaffected by LUNS operation.
Both terminals will receive Tandem’s ESS message 10 (banner message) when they
are started with SCF. When HELP is entered on a terminal, that terminal will
receive a menu that has been created with the SNAXUTL ADD ESSMSG
command.
Terminal LUs will initiate all sessions by means of character-coded commands.
Therefore, for this example, they can log on to:
The TACL process on \SYS1 with the command TACL
The Order Entry process on \SYS1 with the command ORDERENTRY
The TSO process on the host system with the command TSO
For the Order Entry application, LUNS will use the protocol assigned in the ESS
table logon record named ORDERENTRY. For this example, the protocol is CRT.
Because both terminals will be given the appropriate protocol (ITI) for the TACL
application by means of the SCF ADD LU command, it is not necessary to specify
a protocol for the TACL process. Because TSO is a host program accessed by
means of passthrough, it is not necessary to specify a protocol in this case either.
The ESS table will contain a record whose command-name field is the character-
coded command “LOGOFF”. This command will allow the terminal user to log
off from Order Entry and TSO (and the Inventory application when it is added in
the second part of the example).
The TACL will be associated, through SCF, with the Tandem Creator process.
Order Entry’s logon record will contain the subdevice name of the Tandem
Creator process in its PLUNAME field. The logon records for both processes will
contain a CONCDATA field specifying startup parameters. The Creator process
uses these parameters when it creates the TACL and when it interfaces with the
PATHMON $PATHX to log on LU3 and LU4 to Order Entry.
Terminals will receive all Tandem ESS messages. All host USS messages will be
presented to a terminal when it is in session with TSO.
Terminal users will be able to establish a static passthrough path with the host
system by entering the HOST command. They will thereby receive the host’s USS
message 10. They can return to the Tandem system and receive ESS message 10 by
entering the TANDEM command.