Primary
This AT&T module, which is always installed in the center slot
processor
of the primary carrier, manages the components of your
module
premises equipment. See also Expansion processor module.
206 Module
The AT&T equipment component that contains jacks for
connecting up to two Centrex lines and up to six extensions
to the equipment controller.
Installation Guidelines
In this chapter, we refer to line jacks and extension jacks; these terms describe
the locations where connections are made to the equipment controller. During
installation, each Centrex line is connected to a line jack on the controller. In
addition, each phone (or optional device) is connected to an extension jack on
the controller (either directly or via a wall jack). Once connections are made,
the controller associates each line jack (numbered consecutively from 01
through 24) with a specific extension jack (numbered consecutively from 10
through 33). Each Centrex line is the primary line for the phone at the
corresponding extension. (Refer to Form B in the System Planner, which
records how your phone numbers are assigned to system extensions.)

Placement of Carriers and Modules

Carriers.
You will be installing either one or two carriers, depending on
■
the number of lines you have (see “Capacity,” on page 1-8). If you are
going to install the expansion carrier, plan to install it to the right of the
primary carrier. Install the backplane(s) within five feet of the network
interface jacks and a grounded 110 VAC electrical outlet not controlled by
a switch. If you are installing two carriers, both must be plugged into the
same power outlet. In addition, when you mount the backplane(s) on the
wall, leave at least six inches of clearance at the top and sides, and two
feet at the front and bottom.
Modules.
To install modules, follow the rules below:
■
Install the primary processor module in the center slot of the primary
■
carrier.
■
If you are installing the expansion carrier, install the expansion
processor module in its center slot.
■
The first (leftmost) slot in each carrier must contain a 206 module.
■
Do not skip slots when installing 206 and 400 modules.
A 400 module must be installed to the right of each 206 module
■
(except the last 400 module, which can be skipped if you do not need
the additional lines).
If a second 206 module is installed in a carrier, it must be installed to
■
the right of the processor module.
Figure 2-1 shows the two carriers, with line and extension jacks numbered, for a
configuration containing 24 lines and 24 extensions. For a detailed explanation
of line and extension jack numbering, see Chapter 3.
Installing the Equipment
2-3