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Control Unit
System Numbering
2-12 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 in 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.
Planning Form Instructions
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 PBX System
Form 2a, System Numbering - Station Jacks.
Note: Form 2a is a multipage listing 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 PBX System Form 1, System Planning, for both reference
and to make additional entries.
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