Studio Technologies 45DC Manuel utilisateur

studio-tech.com

50017-0620, Issue 4

User Guide

Issue 4, June 2020

This User Guide is applicable for serial numbers

M45DC-00151 and later with application rmware 3.1 and later

and Dante rmware 4.6.0 (UltimoX2 4.2.2.3) and later

Model 45DC

Dante to Dual Party-Line

Intercom Interface

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Model 45DC User Guide Issue 4, June 2020

Studio Technologies, Inc. Page 3

Table of Contents

Revision History ............................................................ 4

Introduction................................................................... 5

Installation ..................................................................... 9

Conguration ................................................................ 12

Operation ...................................................................... 15

Technical Notes............................................................. 20

Specications................................................................ 25

Issue 4, June 2020 Model 45DC User Guide

Page 4 Studio Technologies, Inc.

Revision History

Issue 4, June 2020:

1. Documents deletion of pull-up/pull-down capability.

Issue 3, March 2016:

1. Documents new conguration that allows the party-line active detection function to be

disabled (added to application rmware version 3.1).

Issue 2, August 2015:

1. Documents enhanced unit identication feature (added to application rmware

version 2.5).

2. Adds improvements to IP address conguration assignment explanation.

Issue 1, January 2015:

1. Initial release.

Model 45DC User Guide Issue 4, June 2020

Studio Technologies, Inc. Page 5

Introduction

The Model 45DC Dante®to Dual Party-Line

Intercom Interface is designed for applica-

tions that utilize single-channel analog par-

ty-line (PL) intercom technology. The unit

provides two independent single-channel

interfaces that each support one party-line

audio channel. Single-channel party-line

intercom systems are commonly used in

theater, entertainment, and education appli-

cations where a simple, reliable, low-cost,

and easy to use solution is desired. Analog

party-line products from Clear-Com®are

directly compatible with the Model 45DC.

The Dante Audio-over-Ethernet media

networking technology is used to trans-

port the send and receive audio channels

associated with each of the two party-line

circuits. Two hybrid circuits with automatic

nulling provide excellent audio quality and

high return-loss. (These hybrid circuits are

sometimes referred to as 2-wire to 4-wire

converters.) The Model 45DC is directly

compatible with the latest broadcast and

audio equipment that uses Dante technol-

ogy. An Ethernet connection is all that’s

required to make the Model 45DC part of a

sophisticated, networked audio system.

A Model 45DC can interconnect with devic-

es such as matrix intercom systems, DSP

processors, and audio consoles. The Model

45DC is directly compatible with the RTS

ADAM®OMNEO® matrix intercom network.

Alternately, two Model 45DC units can inter-

connect by way of the associated Ethernet

network. The Model 45DC can be powered

by Power-over-Ethernet (PoE) or an external

source of 12 volts DC. Two party-line power

sources with impedance termination net-

works can be supplied by the Model 45DC,

allowing connection of two sets of user belt-

packs such as the Clear-Com RS-501 and

RS-701. A Model 45DC can also connect

Figure 1. Model 45DC standard “throw-down” front view

Figure 2. Model 45DC back view

Issue 4, June 2020 Model 45DC User Guide

Page 6 Studio Technologies, Inc.

with one or two existing powered and termi-

nated intercom circuits. Audio level meters

provide conrmation of system performance

during setup and operation. Support for

transporting call light signals between Mod-

el 45DC units is also provided.

Standard connectors are used for party-line

intercom, Ethernet, and DC power inter-

connections. The Model 45DC’s enclosure

has a “1/2-rack” 1U form factor and weighs

less than two pounds, making it well suited

for use in portable applications. Alternately,

using one of the optional rack-mount front

panels, one or two Model 45DC units can

be mounted in a single space (1U) of a stan-

dard 19-inch rack enclosure.

Applications

There are two main ways that the Model

45DC can be used in applications. The rst

is to add party-line intercom support for

matrix intercom systems. The second is

to link two stand-alone party-line intercom

systems. Ports on matrix intercom systems

that support Dante, such as the RTS ADAM

with OMNEO, can be routed to the Model

45DC’s Dante receiver (input) and transmit-

ter (output) channels. The Model 45DC’s

circuitry will then convert these signals

into two single-channel party-line intercom

circuits. In this way, adding party-line sup-

port to RTS + OMNEO is a simple task. The

Model 45DC can also be used with matrix

intercom systems that don’t support Dante.

An external analog-to-Dante interface can

be used to convert analog intercom ports

to Dante channels. For example, the Model

44D Interface from Studio Technologies is

specically designed to work with matrix in-

tercom systems. Once in the digital domain,

these Dante channels can be interconnect-

ed with the Model 45DC’s audio input and

output channels.

Two separate sets of party-line intercom

circuits can easily be interconnected using

two Model 45DC Interfaces. At each end

a Model 45DC is connected to one or two

party-line circuits as well as the Dante

network. The Dante Controller applica-

tion will then be used to route the audio

channels between the two units. That’s

it — nothing else is required to achieve

excellent performance.

The Model 45DC can also be used to

“bridge” two single-channel party-line

intercom circuits with one 2-channel party-

line intercom circuit. This involves using

a Model 45DC for the two single-channel

circuits and one of the Studio Technolo-

gies Model 45DR Intercom Interface units

for the 2-channel circuit. The Model 45DR

is the “cousin” of the Model 45DC and

supports one 2-channel party-line inter-

com circuit rather than two single-channel

circuits. These 2-channel circuits, typically

supported by equipment from RTS, are

commonly used in broadcast applications.

Party-Line Interfaces

The Model 45DC’s two party-line intercom

interfaces are optimized for connection

with two single-channel party-line circuits

and user devices such as those associat-

ed with equipment from Clear-Com. (While

the Model 45DC will function in a limited

manner with a 2-channel RTS TW circuit,

the Model 45DR Intercom Interface is the

much-preferred choice.) Each interface

has a party-line active detection function

to ensure that should a beltpack or ac-

tive party-line circuit not be connected

the Model 45DC’s interface circuitry will

remain stable. This unique feature makes

certain that objectionable audio signals,

including oscillations and “squeals,” won’t

be sent to other Dante-enabled devices.

Model 45DC User Guide Issue 4, June 2020

Studio Technologies, Inc. Page 7

A signicant capability of the Model

45DC’s two party-line intercom interfaces

is their ability to supply DC power and

200 ohm AC terminations to “create” two

independent intercom circuits. The 28 volt

DC output can power user devices such

as beltpacks. With up to 150 milliamperes

(mA) of current available, a typical enter-

tainment application could connect up to

three RS-501 or ve RS-701 beltpacks to

each of the Model 45DC’s two interfaces.

In many applications this can eliminate the

need for an external intercom power sup-

ply, thereby reducing total system cost,

weight, and required mounting space. The

power supply outputs are monitored for

over-current and short-circuit conditions.

Under rmware (embedded software)

control the outputs will automatically cycle

off and on to help prevent damage to the

circuitry and connected equipment.

Dante Audio-over-Ethernet

Audio data is sent to and from the Model

45DC using the Dante Audio-over-Ethernet

media networking technology. Audio

signals with a sample rate of 48 kHz and

a bit depth of up to 24 are supported.

Audio receiver (input) and transmitter

(output) channels on associated Dante-

enabled devices can be assigned to the

Model 45DC using the Dante Controller

software application. This makes selecting

the way in which a Model 45DC ts into a

specic application a simple matter.

Analog Hybrids with Auto

Nulling

Two circuits referred to as “hybrids” inter-

face the Dante input and output channels

with the two party-line interface channels.

The hybrids provide low noise and dis-

tortion, good frequency response, and

high return-loss (“nulling”), even when

presented with a wide range of party-line

conditions. Unlike telephone-line (“POTS”)

oriented DSP-based hybrid circuits, the

Model 45DC’s analog circuitry maintains

extended frequency response. With a

passband of 100 Hz on the low end and

8 kHz on the high end, natural-sounding

voice signals can be sent to and received

from a party-line circuit.

The Model 45DC’s sophisticated hybrid

auto nulling function uses a combination

of digital and analog circuitry under micro-

processor control to achieve signicant

trans-hybrid loss. This return-loss “null” is

achieved by making a series of rmware-

directed adjustments to account for the

resistive, inductive, and capacitive condi-

tions that are present on the connected

party-line cabling and user devices. When-

ever one of the Model 45DC’s auto null

buttons is pressed digital circuitry adjusts

the associated hybrid to achieve its maxi-

mum return-loss in less than 15 seconds.

While the nulling process is automatic, it

only takes place upon user request. The

resulting null parameters are stored in

nonvolatile memory.

Pro Audio Quality

The Model 45DC’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. Using passive

and active lters the frequency response

of the audio channels is limited to nomi-

nally 100 Hz to 8 kHz. This range was

Issue 4, June 2020 Model 45DC User Guide

Page 8 Studio Technologies, Inc.

selected to provide excellent performance

for human speech while maximizing the

ability of the hybrid circuits to create sub-

stantial “nulls.”

Audio Meters

The Model 45DC contains two sets of

5-segment LED level meters. Each set of

two meters displays the level of the signals

being sent to and received from a party-

line interface channel. At the time of instal-

lation and setup the meters are invaluable

in helping to conrm correct operation.

During normal operation the meters offer

rapid conrmation of audio signals owing

in to and out of the unit. Additional LED

indicators are also provided on the front

panel, offering a status indication of the

party-line DC power sources, party-line

activity status, and the auto null functions.

Two other LEDs offer a direct indication

of which source is powering the Model

45DC.

Call Light Support

Typical single-channel party-line intercom

circuits provide a call light function by

way of a DC voltage applied to the audio

path. The Model 45DC can detect call light

activity, convert it to a 20 kHz audio tone,

and transport the tone over the Dante

audio path. A Model 45DC unit at the “far

end” will detect the tone and re-generate

the call signal as a DC voltage on the au-

dio path. This allows full “end-to-end” call

light support between two or more Model

45DC units. It also allows a Model 45DC

to send and receive call light status with

an interconnected Model 45DR Dante to

2-Channel Party-Line Intercom Interface.

The Model 45DR is typically used with the

RTS TW-series of party-line user beltpacks

including the popular BP-325.

Ethernet Data, PoE, and DC

Power Source

The Model 45DC connects to a data net-

work using a standard 100 Mb/s twist-

ed-pair Ethernet interface. The physical

interconnection is made by way of a

Neutrik® etherCON RJ45 connector. While

compatible with standard RJ45 plugs,

etherCON allows a ruggedized, locking

interconnection for harsh or high-reliability

environments. The Model 45DC’s operating

power can be provided by way of the Eth-

ernet interface using the Power-over-Eth-

ernet (PoE) standard. This allows fast and

efcient interconnection with the associ-

ated data network. To support PoE power

management, the Model 45DC’s PoE inter-

face reports to the power sourcing equip-

ment (PSE) that it is a class 3 (mid power)

device. The unit can also be powered

using an external source of 12 volts DC.

For redundancy, both power sources can

be connected simultaneously. An internal

switch-mode power supply ensures that all

Model 45DC features, including party-line

intercom circuit power, are available when

the unit is powered by either source. Four

LEDs on the back panel display the status

of the network connection, Dante interface,

and PoE power source.

Simple Installation

The Model 45DC uses standard con-

nectors to allow fast and convenient

interconnections. An Ethernet signal is

connected using a Neutrik etherCON RJ45.

If Power-over-Ethernet (PoE) is available

operation will commence immediately.

An external 12 volt DC power source can

also be connected by way of a 4-pin XLR.

Party-line intercom connections are made

Model 45DC User Guide Issue 4, June 2020

Studio Technologies, Inc. Page 9

using two 3-pin male XLR connectors. The

Model 45DC is housed in a rugged yet

lightweight aluminum enclosure that is de-

signed to be “eld tough.” It can be used

as a standalone portable unit, supporting

what’s known in the broadcast world as

“throw-down” applications. Rack-mount

options are also available allowing one or

two units to be mounted in one space (1U)

of a standard 19-inch rack enclosure.

Future Capabilities and

Firmware Updating

The Model 45DC was designed so that its

capabilities can be enhanced in the future.

A USB connector, located on the Model

45DC’s back panel, allows the applica-

tion rmware (embedded software) to be

updated using a USB ash drive. To imple-

ment the Dante interface the Model 45DC

uses Audinate’s Ultimo™ integrated cir-

cuit. The rmware in this integrated circuit

can be updated via the Ethernet connec-

tion, helping to ensure that its capabilities

remain up to date.

Installation

In this section, signal interconnections will

be made using the connectors located on

the back panel of the Model 45DC. Con-

nections to one or more party-line user

devices or one or two existing party-line

intercom circuits will be made using the

3-pin XLR connectors. An Ethernet data

connection will be made using either a

standard RJ45 patch cable or an ether-

CON protected RJ45 plug. A 4-pin XLR

connector allows the connection of an

external source of 12 volts DC.

System Components

Included in the shipping carton are the

Model 45DC Intercom Interface and a user

guide. If a rack-mount front panel is going

to be used as part of the installation it will

typically be shipped in a separate carton.

If the installation or specic application

requires an external source of 12 volts DC

it needs to be provided separately. An ap-

plicable power supply, the Studio Technol-

ogies PS-DC-02, is available as an option.

Locating the Model 45DC

The location of the Model 45DC will de-

pend on the length of the cable runs

needed to link the unit with the associated

party-line intercom devices. This type of

circuit carries unbalanced audio which can

be susceptible to interference and cross-

talk issues. And since party-line intercom

circuits typically carry DC power a voltage

drop due to resistive loss can become an

issue. In general, minimizing the length

of the party-line intercom cables will help

ensure more reliable and consistent inter-

com system performance. Of equal impor-

tance is the 100-meter (325-foot) Ethernet

cable limitation. A nal location criterion is

to ensure that access to the Model 45DC’s

front panel is available. An optimal loca-

tion will allow convenient use of the auto

null pushbutton and easy observation of

the status and level meters LEDs.

Protecting the Enclosure

The Model 45DC is shipped as a self-con-

tained unit suitable for portable use or

placement in a semi-permanent location.

Installed on the bottom of the chassis

are screw-on “bump on” protectors (also

known as “rubber feet”). These are useful

Issue 4, June 2020 Model 45DC User Guide

Page 10 Studio Technologies, Inc.

if the unit is going to be placed on surfaces

where scratching of either the Model 45DC

or the surface material could take place.

The “feet” can be removed, without the use

of a tool, when rack- or custom-mounting

the unit.

Rack Mounting the

Model 45DC

For permanent or mobile applications it

might be desirable to mount one or two

Model 45DC units into one space (1U) of

a 19-inch rack enclosure. Two rack-mount

front panels, purchased separately, are

available from Studio Technologies. The

following provides details on how to install

and use the panels.

To attach a Model 45DC unit to the single-

unit rack-mount panel, begin the process

by using a 5/64-inch hex wrench to remove

the four 6-32 button-head machine screws

that hold the standard front panel to the

chassis. Note that the screws might be

quite tightly afxed. Ensure that a good-

quality hex wrench is used and press and

hold it rmly while turning counterclock-

wise. Unless this recommendation is fol-

lowed the wrench can “cam out” and the

head could be “stripped.”

Using the screws that were just removed,

attach the rack-adapter front panel to the

Model 45DC’s chassis. To prevent damage

care is required when aligning the front

panel with the LEDs and auto null push-

button switch that protrude through both

the Model 45DC’s chassis and front panel.

Tighten the four screws only after a careful

inspection ensures that the switch and all

28 of the LEDs protrude through the front

panel without interference. To allow vertical

clearance in the associated rack, remove

the four “bump on” protectors from the

bottom of the chassis. They are removed

by using the ngers to rotate them counter-

clockwise; no tool is required. Carefully

protect and store the standard front panel,

along with the “bump on” protectors, for

possible later use.

Mounting a Model 45DC to a dual-unit

rack-mount panel follows the same proce-

dure but will apply to two units. Store both

of the removed standard front panels and

the eight “bump on” protectors for possi-

ble later use. Note that on the rack-panels

graphics the unit on the left is designated

as A while the unit on the right is desig-

nated as B. This is provided so that each

can be easily identied during installation,

troubleshooting, and operation.

Once the desired one or two Model 45DC

units have been installed in a rack-mount

front panel, the assembly can be mounted

into the designated equipment rack. One

space (“1U” or 1.75 vertical inches) in

a standard 19-inch equipment rack is

required. Secure the front panel into

the equipment rack using two mounting

screws per side.

Ethernet Connection

An Ethernet connection that supports

100BASE-TX (100 Mb/s over twisted-pair)

is required for the Model 45DC’s Dante

Audio-over-Ethernet connectivity. A

10BASE-T connection is not sufcient for

Model 45DC operation. A 1000BASE-T

(“GigE”) connection is not supported

unless it can automatically “fall back” to

100BASE-TX operation. An Ethernet con-

nection that supports Power-over-Ethernet

(PoE) is preferred as it will provide operat-

ing power for the Model 45DC. To support

PoE switch (PSE) power management the

Model 45DC will enumerate itself as a PoE

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