Studio Technologies 5132 2012 - Manual (Page 6)

Issue 4, September 2012 Model 5132 User Guide
Page 6 Studio Technologies, Inc.
Model 5132
Party-Line Interface Module
intercom user beltpacks to be directly
interfaced. With a maximum output current
of 180 milliamperes, up to three of the
popular RTS® BP325 devices can be
directly connected. Devices from Clear-
Com® are also compatible.
For applications with an existing party-line
intercom system the Model 5132 is also
directly compatible. The internal power
source and 200 ohm terminations can be
disabled by selecting the appropriate oper-
ating mode by way of a pushbutton switch
on the Model 5132’s front panel.
The 4-wire audio inputs and outputs were
carefully designed for use in permanent
as well as field applications. Filtering on
the inputs minimizes the chance that radio
frequency (RF) energy will interfere with
the audio input sources. Other components
were included to address ESD (“static”)
and DC over-voltage conditions. In addi-
tion, the DC power input is protected from
accidental polarity reversal.
For operation, the Model 5132 only re-
quires connection of analog audio inputs
and outputs, along with 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 supply circuitry within the Model
5132 creates the voltages required for the
analog and digital circuitry.
Standard connectors are used throughout
the Model 5132. The party-line intercom
interface is accessed using a 3-pin male
XLR connector. The 4-wire audio input
and output connections are made using
5-position, 0.1-inch “header” connectors.
The DC power input and data bus con-
nections use a 4-position, 0.1-inch header.
Low-cost IDC (insulation displacement)
mating connectors allow simple intercon-
nection with the audio input, audio output,
DC input, and RS-485 data signals.
For compliance with international broad-
cast 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, produc-
tion, corporate, and government solutions.
Sophisticated 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 sys-
tem. 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.