SNAX/XF LU Network Services Manual

Appendix B ESS System Messages
097841 Tandem Computers Incorporated B–1
When an error occurs during session establishment or termination or when the user
needs to be informed of an event relevant to session establishment or termination,
system messages from the ESS table are displayed at the user’s terminal.
These messages can be modified or deleted by the user through the SNAX/XF Utility,
SNAXUTL.
System messages can also be displayed by the user by entering the message name.
The name of a system message in the ESS table is Snnnn, where nnnn is some decimal
number. Messages in the range S0000 through S0012 are equivalent in meaning to USS
messages 0 through 12 in the IBM USS tables.
Throughout this appendix, character-coded data entered on a display terminal is
referred to as a command.
Finding an Assigned
ESS Table
Problem isolation might require finding the name of the ESS table currently assigned
to a terminal. To find the name, issue an SCF INFO LU terminal-lu-name
command.
If an ESS table was not assigned to the terminal’s LU using SCF or if the currently
active SET table does not contain a default ESS table, the terminal does not have an
ESS table assigned, and it will not be able to use LUNS.
The following is a discussion of ESS table assignment that might prove useful in
correcting problems involving the assignment of an ESS table to a terminal.
An ESS table is assigned to a terminal either explicitly, using SCF, or by default in the
currently active SET table. A SCF assignment takes precedence over a SET table
default designation.
If assigned explicitly with SCF, the terminal’s ESS table name can be specified using
the ESSTABLE attribute in an SCF ADD LU or ALTER LU command. It can also be
specified for LUs subordinate to a line by using the ESSTABLE attribute in an SCF
ADD/ALTER LINE or ADD/ALTER PU command. Once an ESS table name has been
specified for either a line or a PU, it is used, as a default table, for any LU that is added
to that line or PU, provided that the ADD LU command does not include an
ESSTABLE attribute.
An ESS table can be defined as a default table in a LUNS SET table by using the
DEFAULTTABLE Y operand in an ADD SETESS command. This default ESS table
applies to any LU that has not had an ESS table defined using SCF.