System Numbering - AT&T MERLIN LEGEND Key System Planning

Control Unit

System Numbering

System numbering is the process of assigning extension numbers to stations
(telephones and adjuncts), calling groups, paging groups, Park zones, and
Remote Access.
The instructions is this chapter deal only with assigning extension numbers to
stations.
Number the stations in two stages:
Stage One. Decide in what order to connect the telephones and other
equipment to the control unit. To do this, identify station jack types and
match individual components with the jacks that support them.
When the system is turned on, it identifies the type of module installed in
each control unit slot and automatically assigns extension numbers to the
components in exactly the same order in which they are connected to the
control unit. As you plan connections, therefore, you should be aware of the
relationship between the jack's logical ID and the extension number the
system assigns.
The stations are assigned 2-digit extension numbers starting with extension
10 at the station jack with the logical ID of 1. If a user needs a specific
extension number, it is simpler (in terms of programming) to connect that
user's telephone to the station jack that is automatically assigned the
requested extension number.
Stage Two. Decide if the system-assigned extension numbers are
appropriate or if you should renumber all, or some, of the extensions
assigned to the stations.
The system offers three predetermined numbering plans. In addition, you
have the option of creating your own unique numbering plan with extensions
of one to four digits.
Locate and review your Floor Plan and AT&T Equipment List to verify the
equipment you have and how many of each kind of connection are needed.
Record equipment connections and extension numbers on Key System Form
2a, System Numbering — Station Jacks.
Note: Form 2a is a multipage list that accommodates entries for up to 144
stations. It shows the logical IDs for each station, as well as the three
predetermined numbering plans available.
You also need Key System Form 1, System Planning, for both reference and
to make additional entries.
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System Numbering