Studio Technologies 5132 2014 - Manual (Page 6)

Issue 5, October 2014 Model 5132 User Guide
Page 6 Studio Technologies, Inc.
Model 5132
Party-Line Interface Module
intercom user beltpacks to be directly in-
terfaced. With a maximum output current of
180 milliamperes (mA), up to three of the
popular RTS® BP325 devices can be di-
rectly connected. Devices from Clear-Com®
are also compatible.
The Model 5132 is directly compatible with
applications that must interface with exist-
ing party-line intercom circuits. The internal
power source and 200 ohm terminations
can be disabled by way of a pushbutton
switch on the Model 5132’s front panel.
The line-level audio inputs and outputs were
carefully designed for use in permanent as
well as field applications. Filtering on the in-
puts and outputs minimizes the chance that
radio frequency (RF) energy will interfere
with the audio signals. Other components
were included to address ESD (“static”) and
DC over-voltage conditions. The party-line
power source is monitored for protection
against damage due to fault conditions. In
addition, the module’s DC power input is
protected from accidental polarity reversal.
For operation, the Model 5132 only requires
connection of an analog audio input, an an-
alog audio output, and an external source of
nominal 12 volts DC. The acceptable input
voltage range is 10 to 18, allowing a variety
of power sources to be utilized. Power sup-
ply circuitry within the Model 5132 creates
the voltages required for the analog and
digital circuitry.
Standard connectors are used through-
out the Model 5132. Users will access the
party-line intercom interface using a 3-pin
male XLR connector. The line-level audio
input and output connections are made us-
ing 5-position “header” connectors. The DC
power input and data bus connections use a
4-position header. Low-cost IDC (insulation
displacement connector) mating sockets
allow simple interconnection between the
headers and the audio input, audio output,
DC input, and RS-485 data signals.
For compliance with international broadcast
audio level standards two versions of the
Model 5132 are available. The Model 5132S
supports SMPTE® audio levels where the
analog audio reference level is +4 dBu. The
Model 5132E supports applications that
require European Broadcast Union (EBU)
compliance with an analog audio reference
level of 0 dBu.
Model 5132 Party-Line Interface Modules
do not include a mounting enclosure or
chassis. They are intended for mounting
in custom 19-inch rack panels, equipment
boxes, broadcast furniture, “NEMA” I/O
boxes, or other specialized enclosures. It is
expected that integration firms will create
applications that use Model 5132 modules
as part of complete broadcast, production,
corporate, and government solutions. So-
phisticated users will be able to create “one-
off” solutions to solve unique challenges.
Party-Line Interface
The Model 5132’s party-line interface is
very flexible, offering excellent performance
when operating both “stand alone” or inter-
connected with an existing intercom cir-
cuit. When enabled, the internal party-line
intercom power supply circuitry provides
a low-noise, current-limited source with a
nominal 28 volt DC output. Termination net-
works provide the required 200 ohm imped-
ance for the audio signals associated with
the two party-line intercom channels. With
these features the Model 5132’s party-line
intercom interface is essentially identical to
that created by stand-alone intercom power
supplies or powered master stations.