AT&T MERLIN LEGEND Key System Planning page 52

Control Unit
Set Up Space Numbering
Plan
2-22
System Numbering
The unshaded areas of the three-digit numbering plan in Figure 2-4 indicate the
extension numbers available for reassignment. This means you can change the
extension number automatically assigned by the system to one of the available
numbers, for example, extension number 244 through 299. If the available
numbers shown are not adequate to meet your needs, consider the set up
space numbering plan.
Planning Form Instructions
Use Figure 2-4 as you record the extension number information.
1 . If the system includes digital station adjuncts:
Locate Key System Form 2b, System Numbering — Digital/ISDN
Station Adjuncts.
Write the 3-digit extension number—the extentsion number from Form 2a
increased by 200 (within the range 300-443)—in the "Factory-Set
Extension No." column of Form 2b.
2 . If you do not have to renumber any of the 3-digit extension numbers:
Check the "3-Digit" box under the "Renumber System" heading on
Form 2a.
Go to the "Form and Floor Plan Update" instructions later in this
chapter.
3 . If you want to renumber only a few of the 3-digit extensions and enough
numbers are available in the three-digit numbering plan:
Check the "3-Digit" and "Selected Extension Numbers" boxes under the
"Renumber System" heading on Form 2a.
Write the new extension number(s) in the "Renumber To" column on
both Form 2a and Form 2b.
Go to the "Form and Floor Plan Update" instructions later in this
chapter.
Figure 2-5 shows the numbers automatically assigned when the system is
renumbered using the set up space numbering plan. The numbers in the figure
are arranged according to the first digit. The type of equipment or feature to
which they are assigned is shown in the block.