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Terminology
The following terms are used throughout this guide, and are important for
understanding how your system works. In addition, each chapter in this guide
begins with a “Terminology” section that defines key terms used in the chapter.
All terms are also defined in the Glossary.
Centrex
Centrex system
Equipment
controller
Equipment
feature
MLS- and
MLC-model
telephones
Premises
equipment
Standard
phone
System
Telephone services that your local telephone company
provides from a Central Office (CO) located outside your
business premises, including Centrex lines connected to the
equipment controller and the features available on those
Centrex lines. (Your telephone company may call Centrex by
another name.)
The total block of Centrex lines you subscribe to—all or some
of which may be connected to the equipment controller for
your system—together with the Centrex services associated
with those lines. See also Premises equipment and System.
The AT&T product that you purchased as part of your
system. This product consists of a group of modules that
connect Centrex lines coming into your building to the
extensions in your system. The equipment controller also
provides equipment features.
A feature provided by your equipment controller (as opposed
to a service provided by Centrex).
The AT&T telephones that you purchased as part of your
system. These telephones are specifically designed for use
with the equipment controller. Models include the MLS-34D™
telephone, MLS-12D™ telephone, MLS-12™ telephone,
MLS-6™ telephone, and MLC-6™ telephone.
The AT&T equipment controller and the MLS- and
MLC-model telephones that you purchased as part of your
system, plus all other telecommunication devices that are
connected to your equipment controller. For purposes of this
guide, premises equipment does not include any equipment
that connects directly to Centrex lines without going through
the equipment controller. See also System and Centrex
system.
An industry-standard touch-tone or rotary phone such as you
might have in your home. Some standard phones include
special feature buttons for frequently-used calling functions.
Your premises equipment, in combination with the Centrex
lines that are connected to your equipment controller and the
Centrex services that are available on those lines. See also
Centrex system and Premises equipment.
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