Studio Technologies 5130 User Manual
Model 5130
Party-Line Interface
Module
User Guide
Issue 5, July 2013
This User Guide is applicable for serial numbers
M5130-00301and later
Copyright © 2013 by Studio Technologies, Inc., all rights reserved
www.studio-tech.com
50177-0713, Issue 5
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Party-Line Interface
Model 5130
Module
Table of Contents
Introduction ................................................................... 5
Installation .................................................................... 7
Configuration ................................................................ 9
Operation ...................................................................... 10
Technical Notes ............................................................ 12
Specifications ............................................................... 18
Appendix A—Model 5130 Front Panel and
Printed Circuit Board (PCB) Dimensions ...................... 19
Appendix B–Interconnection Details ............................. 20
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Party-Line Interface
Model 5130
Introduction
The Model 5130 Party-Line Interface Module is a compact, self-contained unit for
use in custom broadcast, live-performance,
and general party-line intercom applications. The module provides a high-quality
2-channel party-line to analog line level
(“4-wire”) audio signal interface in an easy
to use yet technically sophisticated package. The module’s basic functions include
two channels of 2-wire-to-4-wire conversion with auto-null capability, input and
output level metering, a +28 volt DC partyline power source with two channels of 200
ohm intercom audio termination, and DC
output control and status monitoring. Partyline beltpack user devices can be directly
connected. Two analog inputs and two
analog outputs interface the Model 5130
with a variety of external audio transport,
matrix intercom, and infrastructure equipment. Module operation requires only an
externally-provided source of 12 volts DC.
Advanced features include remote control
and monitoring capability when installed
with remote access modules available from
Studio Technologies.
Applications for the Model 5130 include
sports broadcasting booth packages,
remote news gathering “fly packs,” stadium
Module
audio/video interface (I/O) locations, and
government/corporate/performance space/
aerospace test infrastructure projects. The
number of Model 5130 modules used in a
project can vary widely—from one to
dozens. And in each case the performance
will be completely “pro” with audio quality,
reliability, and installation flexibility matching that of larger-scale products. Typical
applications will find the Model 5130’s 4wire audio inputs and outputs being interfaced with fiber-optic transport modules,
matrix intercom systems, and audio/video
routers.
The Model 5130 provides a full-featured
2-channel interface which includes two
2-wire-to-4-wire hybrid circuits with automatic nulling capability. The analog hybrid
circuitry provides excellent audio quality
and high return-loss. Audio level meters
provide confirmation of system performance during setup and operation. The
Model 5130’s party-line interface is accessible using a 3-pin male XLR connector.
This allows industry-standard party-line
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.
Figure 1. Model 5130S Party-Line Interface Module Front and Back Views
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Party-Line Interface
Model 5130
Module
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 addition, the DC power input is protected from
accidental polarity reversal.
For operation, the Model 5130 only requires 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
5130 creates the voltages required for the
analog and digital circuitry.
Standard connectors are used throughout
the Model 5130. 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 broadcast audio level standards two versions of
the Model 5130 are available. The Model
5130S supports SMPTE® audio levels
where the analog audio reference level
is +4 dBu. The Model 5130E supports
applications that require European Broadcast Union (EBU) compliance with an
analog audio reference level of 0 dBu.
Model 5130 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 5130
modules as part of complete broadcast,
production, corporate, and government
solutions. Sophisticated users will be
able to create “one-off” solutions to solve
unique challenges.
Party-Line Power Source
The party-line intercom power supply circuitry provides a low-noise, current-limited
source with a nominal 28 volt DC output.
Termination networks provide the required
200 ohm impedance for the audio signals
associated with the two party-line intercom
channels. With these features the Model
5130’s party-line intercom interface is essentially identical to that created by standalone intercom power supplies or powered
master stations.
Logic circuitry contained within the Model
5130 monitors the voltage on pin 2 for a
low-voltage/over-current condition. If detected, the DC output will automatically
enter a protection mode. Once the fault
condition is removed normal operation will
again resume. The pin 2 status LED offers
the user a simple “go/no go” indication for
rapid troubleshooting.
Analog Hybrids with Auto
Nulling
The 2-wire-to-4-wire hybrids provide low
noise, low distortion, good frequency
response, and high return-loss (“nulling”),
even when presented with a wide range
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Party-Line Interface
Model 5130
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of party-line conditions. Unlike telephoneline (“POTS”) oriented DSP-based hybrid
circuits, the Model 5130’s analog circuitry
maintains extended frequency response.
With this wide audio bandwidth, naturalsounding voice signals can be sent to, and
received from, the connected party-line
user devices. This bandwidth also allows
high-frequency “call light” and “mic kill” signals to pass through to connected 4-wire
equipment.
The Model 5130’s sophisticated auto nulling function uses analog circuitry under
microprocessor control to achieve significant trans-hybrid loss. This return-loss
“null” is achieved by making a series of
software-directed adjustments to account
for the resistive, inductive, and capacitive
conditions that are present on the connected party-line user devices and associated cabling. Whenever a user presses the
Model 5130’s auto null button digital circuitry adjusts the 2-wire-to-4-wire hybrids
to achieve their maximum return-loss for
both interface channels. The nulling process is automatic, lasting less than
15 seconds, and only takes place upon
user request. The resulting null parameters
are stored in non-volatile memory.
Audio Inputs and Outputs
Two analog line-level inputs and two outputs are associated with the 4-wire portion
of the Model 5130’s circuitry. These are
intended to interconnect with a variety of
devices, including matrix intercom systems, audio-over-fiber transport systems,
and specialized audio equipment. The
audio input and output circuitry is electronically balanced and capacitor coupled
to minimize the chance that hum, noise,
or interfacing issues will occur. The two
Model 5130 versions allow compatibility
with equipment that supports SMPTE (+4
dBu) and EBU (0 dBu) analog audio level
standards.
Indicators
The Model 5130 contains four 5-segment
LED level meters. Two meters display the
level of the signals being received from the
party-line channels and two display the
level being sent to the party-line channels.
At the time of installation and setup the
meters are invaluable in helping to confirm
correct operation. During normal operation
the meters offer rapid confirmation of the
audio signals flowing into and out of the
module. Three additional LED indicators
are also provided, offering status indications of the party-line DC power supply,
auto null, and remote control data func
tions.
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Pro Audio Quality
The Model 5130’s audio circuitry was
designed in the spirit of professional audio
equipment rather than that found in typical
party-line intercom gear. High-performance
components are used throughout, providing low-distortion, low-noise, and high
headroom. The party-line DC power source
offers a unique level of performance—its
ability to deliver power while maintaining
audio quality is simply unmatched.
Installation
Integration of the Model 5130 into the
selected application is quite simple, only
requiring connecting analog audio inputs
and outputs along with DC power. Some
applications will also require connection
to the RS-485 data bus. The audio signals
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