SNAX/XF LU Network Services Manual

Building the ESS Tables
Using LUNS
097841 Tandem Computers Incorporated 2–11
Figure 2-1. LUNS’ Use of the REPDATA Field in Passthrough
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After receiving the character-coded command CREDIT from a terminal, LUNS
searches the ESS table and finds a corresponding command name field.
LUNS then finds A in the REPDATA field.
LUNS send the character-coded command "A" to the host.
The host searches its USS table and finds A.
1
2
3
4
1 2
3
4
A
Host
USS Table
Record
CREDIT, LOGON–CHAR, SENDHOST Y, REPDATA A
Character-Coded Command:
A
Tandem
ESS Table
Record
Other optional operands when the CMDTYPE is LOGON-CHAR include RECSIZE,
and CHARACTERSET.
All passthrough sessions established with CMDTYPE LOGON-CHAR impose special
requirements for logging off. For these requirements, see the next subsection, “Logoff
Records for Logging Off All Processes.”
Note Use the SNAXUTL operand MUTLTIPLELOGON to establish passthrough sessions with CMDTYPE
LOGON-CHAR. This avoids situations in which a previous unsuccessful logon attempt might prevent
further logons by a given Tandem LU. For more information, see “ADD ESSCMD” in Appendix A,
”SNAX/XF Utility.”
When the CMDTYPE is INITSELF-RECEIVED, do not specify a PLUNAME. LUNS
establishes the passthrough session by using the DLU name in the INIT-SELF
command it receives from the terminal. (Note that this name must match the record's
command-name field.) You can, however, use the PLUNAME operand to specify a
different DLU name. Figure 2-2 shows how LUNS then processes the network-
services request.