6 Memory description
The ROM for Generic 1111; 1211, and 13 11 is contained in a QPC579 CPU
Function Unit.
Templates
A template is a map of the pattern of keys/features assigned to a telephone,
The protected data structure for the SL- 1 NE-500/2500 and digital
telephones is based on the concept of shared templates. For example, if two
or more telephones have identical key/feature layouts, then the data
regarding this layout is contained in a single template, thereby reducing the
storage required for data description.
The operation of the template mechanism is internal and is transparent to
the user. Templates are created automatically either by service change
programs or by the sysload program at system startup. The data print
program (Overlay 20) of 553-3001-400 has been extended to assist in
optimizing template usage. The program can print:
-
individual templates or all templates in the system.
-
the number of telephones using a particular template.
-
the Terminal Numbers (TNs) using a template.
-
the total number of templates defined and the number of templates used
by at least one telephone.
..-_
IVole
:
A large number of telephones clustered around a relative small
number of templates indicates efficient use of templates.
When data is entered into the system, use the following guidelines to
maximize the protected memory savings provided by the template
mechanisms.
(a) If two or more telephones have the same functions defined, they should,
if possible, have the same key/feature layout assigned. This ensures
that all such telephones and add-on modules share the same template.
(b)
For telephones that have the same functions defined but their auto-dial
and/or call-forward features have different number sizes, it is less
expensive (in terms of memory) to make the sizes of the numbers equal
rather than assign the telephones to different templates. The rule to be
used
is
that a new template requires at least 12 words of protected data
for SL-1 telephone sets and four words for 500/2500 telephones,
whereas four extra digits use only 1 word.
Memory calculations 553-2201-l 51 Appendix 1
c.