SNAX/XF LU Network Services Manual

Building the ESS Tables

Using LUNS

097841 Tandem Computers Incorporated 2–13

Such a logoff record must have a character-coded command for its command-name

field, and CMDTYPE must be specified as LOGOFF. No further operands need be

included.

Passthrough sessions established using CMDTYPE LOGON-CHAR cannot serve as an

all-purpose logoff record. The host establishes all such sessions through its own USS

table and terminates them in the same way. Consequently, a terminal user on the

Tandem system must know and use the host's character-coded logoff command.

However, if you choose to make the Tandem command the same as that on the host,

the terminal user can enter the same sequence of characters when logging off, no

matter how the session was established, and will thus remain completely unaware of

any environment switch. Figure 2-3 shows the logoff sequence for a passthrough

session that has been established with a logon record that specified CMDTYPE

LOGON-CHAR.

Figure 2-3. Logoff Sequence for Passthrough Sessions Where the Logon Record Specified

LOGON-CHAR

008

"LOGOFF"

UNBIND

Host System LUNS Terminal

With terminals that send SNA-formatted TERM-SELF commands, LUNS does not use

the ESS table to process logoffs. Thus, for terminals that log on to applications through

logon records specifying CMDTYPE INITSELF-RECEIVED, a logoff record is never

needed.

Order Records for Host

SSCP-LU Sessions (Static

Passthrough)

To allow LUNS to establish and terminate a host SSCP-LU path, you must build two

records in the ESS table. In each, you must designate a separate character-coded

command for the command-name field and specify the CMDTYPE as ORDER. In the

record LUNS uses to establish the path, you must specify STATIC ON. If the gateway

lines, PUs, and LUs reside on a remote system within an Expand network, you must

also specify either GATELINE, GATEPU, or GATELU, using the fully qualified name

of the line, PU, or LU you choose for the session.

If the host is not an AS/400 system you need only specify STATIC OFF in the record

used to terminate the path.