Glossary I267
Directory Number (DN): A unique number
which is automatically assigned to each
telephone or Data Terminal during your
system’s installation. The DN, also referred
to as an Intercom number, allows the
Norstar system to identify each device
connected to the Key Service Unit or
Expansion Module. The DN is often used
to identify a telephone when settings are
assigned during Configuration and
Administration programming.
Directory Number (DN) Length: A non-
expanded system can have a DN length of
2, 3, or 4 digits. An expanded system (a
system with an Expansion Cartridge
installed) can have a DN length of 3 or 4
digits. All Directory numbers for the system
must be the same length. The default DN
length is two digits for a non-expanded
system, and three digits for an expanded
system. The lowest default DN is “21” in a
two digit system, “221” in a three digit
system, and “2221” in a four digit system.
Display: A Liquid Crystal Display (LCD) on
the telephone that provides information
related to feature operation and
programming.
Display Button: The Norstar M7310 and
M7324 telephones are each equipped with
three buttons located directly beneath the
Liquid Crystal Display. During feature
operation or programming, some or all of
these buttons may be used to provide you
with further options. If an option is
available, it is shown in the bottom row of
the two column display, directly above the
corresponding display button.
DRT Delay: The number of rings before a
Delayed Ring Transfer occurs. This is
assigned in section “3. Call Handling” of
Configuration programming.
DRT to Prime: See “Delayed Ring
Transfer to Prime”.
Emergency Telephone: A single line
telephone (also referred to as a 500/2500
telephone) that becomes active when there
is no power to the Key Service Unit.
Expansion Cartridge: The Expansion
Cartridge allows Expansion Modules to
connect to the Key Service Unit, providing
the opportunity to increase the number of
outside and Intercom lines that the system
can handle (beyond the 8X24 Key Service
Unit). The Expansion Cartridge is inserted
into the Key Service Unit, and a DS-30
cable connects the Expansion Cartridge to
each Expansion Module. Expansion
Cartridges are available with two or six
ports.
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Expansion Module: A Trunk Module or a
Station Module. A maximum of six
Modules may be installed with the use of
the six port Expansion Cartridge. A
maximum of two Modules may be installed
with a two port Expansion Cartridge.
External Paging: A Norstar feature that
allows voice announcements to be made
over an externally mounted loudspeaker
(supplied by the customer) connected to
the Key Service Unit.
Feature: A Norstar feature performs a
useful task that uses system-wide,
telephone, or line parameters in helping
you to optimize your use of the Norstar
equipment.
Feature Button: This oblong grey
button is the first button you press when
using a feature, or to gain access to
programming with an Access Code. This
button indicates to the system that the
string of digits which follows is a feature
code.
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