AT&T 945 User Manual page 7

This 945 telephone is fully compatible with any AT&T Four-Line Intercom
Speakerphone 984 or 974 units you may have installed. You can use a total
of 16 945/974/984 units together as extensions in your phone system.
This 945 telephone is also compatible with any AT&T 964/955/944 phones
you have previously installed. This 945 telephone is NOT compatible with
any 843, 853, 854, 874, or 954 telephones you may have previously installed.
NOTE: If you have one or more 964, 955, or 944 phone(s) installed in
the same phone system with this 945 telephone, you can only have 12
extensions and 15 telephone lines in the phone system.
• You must have a modular telephone jack and an electrical outlet not
controlled by a wall switch near where you're installing the phone.
The total length of telephone wiring used in this system MUST
NOT be more than 600 feet. In some cases a Z800A filter can
be used in a phone system with more than 600 feet of wire.
AT&T highly recommends that a Z800A filter be installed by a
professional. AT&T CANNOT guarantee that this telephone
will work with such a filter, and IS NOT responsible for such
installations. A Z800A filter can be obtained by calling
800 222-3111
• Identify the number of phone lines you'll use.
• Plan the layout of your phone system.
• All connected phones must have the same Line 1 phone number
for the Intercom and Page features to work.
Every individual phone in your telephone system MUST be
assigned a unique extension number for the Intercom feature to
work. All system phones will sound an error tone until you assign
separate extension numbers to each unit. For directions see
"Assign an Extension Number to Your Phone" on page 21 of this
manual for directions.
• Decide if you want a private line. A private line does not appear
on all connected phones.
• Choose your setting for each feature. You will need to program
the features after installation (see "Programmable Features List"
beginning on page 6 for a brief description of the features. See the
FEATURE SETUP section beginning on page 18 for programming
instructions.)
.
3