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Installation Manual
14
3.
Connection to the Paging System
General Guidelines
The UPAM is designed to connect to typical “centrally-amplified” and “self-amplified” paging and
sound systems. “Centrally-amplified” systems generally use one amplifier to distribute the page audio to
large numbers of speakers. “Self-amplified” systems generally rely on small amplifiers, built-in on each
speaker or horn. Since the types of connectors used on this equipment varies, and is not standard between
manufactures, you should be familiar with the basic features of these systems so that you can connect
the UPAM to the correct input.
Installation consists of connecting the
PR
and
PT
terminals on the UPAM to the proper paging system
input terminals. In a central-amplified system, the amplifier’s 600-ohm/Lo-Z input provides the ideal
connection; however connection can be made to Hi-Z or microphone inputs, when the transformer (Model
WMT-1A) included in the UPAM-K is used. In self-amplified systems, connection can be made to the
individual amplifiers or to a smaller buffer amplifier.
The illustrations in this section provide basic hookup information to typical equipment, and
procedures may vary. Read the UPAM CPE Reference Guide to gain a better understanding of paging
systems and input types.
You should be aware that certain self-contained, customer-owned telephone paging systems (i.e.,
Terryphone) are not compatible with UPAM installation. These systems were originally installed with
dedicated telephones or handsets. They were not designed to work in conjunction with a telephone
system, and provide no compatibility for page port access.
Typical Installations
Connecting the UPAM to an amplifier’s Lo-Z/600-ohm input
You can connect the UPAM directly to an amplifier’s 600-ohm input. Some of the procedures below
may vary. The illustration on the next page shows a typical installation.
1.
Make sure that the amplifier is turned off.
2. Connect one side of the amplifier input to the UPAM PT terminal.
3. Connect the other the other side of the amplifier input to the UPAM PR terminal.
4.
Connect any background music source to the BGM IN jack (RCA-type) on the UPAM.
Caution
If the amplifier’s input is unbalanced (one side of the input terminal is connected to
ground), you must connect the PR terminal on the UPAM to the grounded amplifier
terminal. Reversing these connections can short the BGM source output. (The WMT-1A
transformer can be used to "float" the unbalanced input and eliminate this problem.
5.
6.
7.
8.
Connect speaker loads to amplifier’s output terminals, if necessary.
Turn amplifier volume control to minimum.
Turn amplifier on.
Set amplifier level (see Specific Instructions for the particular telephone access mode being used).