Studio Technologies 374 Manuale utente

www.studio-tech.com

50627-0916, Issue 2

User Guide

Issue 2, September 2016

This User Guide is applicable for serial numbers

M374-00151 and later with application ﬁrmware 1.3 and later

and Dante ﬁrmware 2.0 (Ultimo 3.10.1.12) and later

Model 374 Intercom Beltpack

This page intentionally left blank.

Model 374 User Guide Issue 2, September 2016

Studio Technologies, Inc. Page 3

Table of Contents

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

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

Getting Started .............................................................. 7

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

Technical Notes ............................................................. 18

Speciﬁcations ................................................................ 21

Issue 2, September 2016 Model 374 User Guide

Page 4 Studio Technologies, Inc.

Revision History

Issue 2, September 2016:

1. Revised to show support for 44.1 and 48 kHz sampling rates.

Issue 1, August 2016:

1. Initial release.

Model 374 User Guide Issue 2, September 2016

Studio Technologies, Inc. Page 5

Introduction

The Model 374 Intercom Beltpack starts

with the features offered by traditional

broadcast party-line (PL) intercom user

devices and adds a range of new features

along with the advanced performance and

capabilities that Dante audio-over-Ethernet

provides. With four independent talk and

listen channels the Model 374 bridges

the gap between typical single- and dual-

channel party-line devices and permanent-

ly installed multi-channel intercom panels.

Imagine the possibilities—four channels

of high-quality party-line intercom in a

compact, user-worn package.

Over a standard IP network, multiple

Model 374 units can be used in PL inter-

com applications with help from an exter-

nal Dante-enabled audio matrix. Or, units

can be used “point-to-point” or directly

interfaced with ports on compatible matrix

intercom systems. Only a single Power-

over-Ethernet (PoE) connection is required

for operation. Key user features can be

easily conﬁgured including preampliﬁer

gain, independent talk button operation,

and individual-channel headphone signal

routing. User features include integrated

sidetone, remote talk channel turn off

(“mic kill”), and monitor only modes. This

capability, along with the great audio qual-

ity provided by the digital audio signal

path, offers a unique and powerful user

experience.

Set up and conﬁguration of the Model

374 is simple. An etherCON® RJ45 jack

is used to interconnect with a standard

twisted-pair Ethernet port associated with

a local-area network (LAN). This connec-

tion provides both power and bidirectional

digital audio. A broadcast or intercom-

style stereo or monaural headset with a

dynamic microphone interfaces with the

unit using a 5-pin XLR connector. DIP

switches and software-based conﬁgura-

tion are used to establish the unit’s operat-

ing parameters. Four “push-in/push-out”

rotary level controls make it easy to set

and maintain the desired headphone out-

put. The Model 374’s enclosure is made

from an aluminum alloy which offers both

light weight and ruggedness. A stainless

steel “belt clip,” located on the back of the

unit, allows direct attachment to a user’s

clothing.

The audio quality of the Model 374’s four

audio channels is excellent, with low

distortion, low noise, and high headroom.

Careful circuit design and rugged com-

ponents ensure long, reliable operation.

Figure 1. Model 374 Intercom Beltpack top and bottom views

Issue 2, September 2016 Model 374 User Guide

Page 6 Studio Technologies, Inc.

A wide range of applications can be sup-

ported, including sports and entertain-

ment TV and radio events, streaming

broadcasts, corporate and government AV

installations, and post-production facilities.

Dante Audio-over-Ethernet

Audio data is sent to and received from

the Model 374 using the Dante audio-over-

Ethernet media networking technology.

As a Dante-compliant device, the Model

374’s four output (Dante transmitter) and

four input (Dante receiver) audio channels

can be interconnected (routed) with other

devices using the Dante Controller soft-

ware application. The Dante transmitter

and receiver channels are limited to

supporting four Dante ﬂows, two in

each direction. The digital audio’s bit

depth is up to 24 with a sampling rate

of 44.1 or 48 kHz.

Two bi-color LEDs provide an indication

of the Dante connection status. The Dante

Controller’s identify command takes on a

unique role with the Model 374. Not only

will it cause the talk button LEDs to light

in a unique highly visible sequence, it will

also turn off any active talk channels.

Audio Quality

The Model 374’s completely “pro” perfor-

mance is counter to the less-than-stellar

reputation of typical intercom audio.

A low-noise, wide dynamic-range micro-

phone preampliﬁer and associated volt-

age-controller-ampliﬁer (VCA) dynamics

controller (compressor) ensures that mic

input audio quality is preserved while

minimizing the chance of signal overload.

The output of the microphone preamp and

compressor is routed to an analog-to-digi-

tal converter (ADC) section that supports a

sampling rate of 44.1 and 48 kHz with a bit

depth of up to 24. The audio signal, now in

the digital domain, routes through the pro-

cessor and on to the Dante interface sec-

tion where it is packetized and prepared

for transport over Ethernet.

Audio input signals arrive via the four

Dante receiver channels and pass into

the Model 374’s processor. The sampling

rate will be 44.1 or 48 kHz with a bit depth

of up to 24. Channel routing, headphone

level control, and sidetone creation are

performed within the digital domain. This

provides ﬂexibility, allows precise control,

and keeps the ﬁve level potentiometers

(channels 1-4 and sidetone) from having

to directly handle analog audio signals.

The audio signals destined for the 2-chan-

nel headphone output are sent to a high-

performance digital-to-analog converter

and then on to robust driver circuitry. High

signal levels can be provided to a variety of

headsets, headphones, and earpieces.

Conﬁguration Flexibility

A highlight of the Model 374 is its ability

to be easily conﬁgured to the meet the

needs of speciﬁc users and applications.

Three DIP switches allow control of the

microphone preampliﬁer gain and a button

backlight mode. A software-based conﬁgu-

ration mode allows optimizing talk button

operation and the routing of the audio

inputs to the headphone output channels.

The gain of the microphone preampliﬁer

can be selected from among four choices.

This allows compatibility with the dynamic

microphones that are part of the many

industry-standard broadcast and intercom

headsets. A button backlight mode can

be enabled to ensure that an LED associ-

ated with each of the four talk buttons

Model 374 User Guide Issue 2, September 2016

Studio Technologies, Inc. Page 7

will always be lit. This is provided for

applications where there is little or no ambi-

ent lighting available to assist in identifying

button locations.

A highly unique Model 374 feature is the

ability to individually conﬁgure the way in

which the four pushbutton switches func-

tion; four choices are available. For stan-

dard intercom beltpack operation either

push to talk or push to talk/tap to latch

operation can be selected. For situations

where only monitoring of an intercom

channel is desired a talk disable mode is

available. And for advanced monitoring-

only situations a mode can be selected

such that a button will serve in an audio

on/off role.

Four audio channels arrive via Dante and

are destined for the 2-channel headphone

output. Each input can be independently

routed to the left and right, left-only, or

right-only headphone channels. This ﬂex-

ibility allows a variety of listening environ-

ments to be created, including stereo,

single-channel monaural, and dual-

channel monaural.

Ethernet Data and PoE

The Model 374 connects to an Ethernet

data network using a standard 100 Mb/s

twisted-pair Ethernet interface. The physi-

cal interconnection is made by way of

a Neutrik® etherCON RJ45 connector.

While compatible with standard RJ45

plugs, etherCON allows a ruggedized and

locking interconnection for harsh or high-

reliability environments. An LED displays

the status of the network connection.

The Model 374’s operating power is pro-

vided by way of the Ethernet interface us-

ing the 802.3af Power-over-Ethernet (PoE)

standard. This allows fast and efﬁcient

interconnection with the associated data

network. To support PoE power man-

agement, the Model 374’s PoE interface

reports to the power sourcing equipment

(PSE) that it’s a class 1 (very low power)

device. If a PoE-enabled Ethernet port

can’t be provided by the associated Ether-

net switch a low-cost PoE midspan power

injector can be utilized.

Future Capabilities and

Firmware Updating

The Model 374 was designed such that

its capabilities and performance can be

enhanced in the future. A USB connector,

located on the unit’s main circuit board

(underneath the unit’s cover), allows the

application ﬁrmware (embedded software)

to be updated using a USB ﬂash drive.

The Model 374 uses Audinate’s Ultimo™

integrated circuit to implement the Dante

interface. The ﬁrmware in this integrated

circuit can be updated via the Ethernet

connection, helping to ensure that its

capabilities remain up to date.

Getting Started

What’s Included

Included in the shipping carton are a

Model 374 Intercom Beltpack and a print-

ed copy of this guide. As a device that is

Power-over-Ethernet (PoE) powered, no

external power source is provided. Should

a PoE midspan power injector be required

it must be purchased separately.

Connections

In this section signal interconnections

will be made using the two connectors

located on the bottom of the Model 374’s

Issue 2, September 2016 Model 374 User Guide

Page 8 Studio Technologies, Inc.

enclosure. An Ethernet data connection

with Power-over-Ethernet (PoE) capability

will be made using either a standard RJ45

patch cable or an etherCON protected

RJ45 plug. A dual- or single-earpiece

headset (stereo or monaural) will be con-

nected using a cable-mounted 5-pin male

XLR connector.

Ethernet Connection with PoE

A 100BASE-TX Ethernet connection that

supports Power-over-Ethernet (PoE) is

required for Model 374 operation. This one

connection will provide both the Ethernet

data interface and power for the Model

374’s circuitry. A 10BASE-T connection is

not sufﬁcient and a 1000BASE-T (“GigE”)

connection is not supported unless it can

automatically “fall back” to 100BASE-TX

operation. The Model 374 supports Ether-

net switch power management, enumerat-

ing itself as a PoE class 1 device.

The Ethernet connection is made by way

of a Neutrik etherCON protected RJ45

connector that is located on the bottom

of the Model 374’s enclosure. This allows

connection by way of a cable-mounted

etherCON connector or a standard RJ45

plug. The Model 374’s Ethernet interface

supports auto MDI/MDI-X so that a “cross-

over” or “reversing” cable will not be

required.

Ethernet Connection without PoE

As previously discussed in this guide, the

Model 374 was designed such that the

Ethernet connection will provide both data

and Power-over-Ethernet (PoE) power.

There may be situations where the asso-

ciated Ethernet switch does not provide

PoE power. In such cases an external PoE

midspan power injector can be used. If

the selected midspan power injector is

802.3af-compatible it should function cor-

rectly. Midspan units are available from a

variety of sources, including many on-line

retailers.

Headset Connection

The Model 374 provides a 5-pin female

XLR connector that interfaces with the

microphone and headphone connections

of an intercom or broadcast-style headset.

Refer to Figure 2 for connection details.

The microphone input connections are

intended for use with unbalanced dynamic

microphones. Balanced microphones

should, in most cases, also function cor-

rectly if the signal – (low) is connected to

Model 374’s mic in –/shield connection.

No support is provided for microphones

that require low-voltage “eletret,” P12

phantom, or P48 phantom powering.

To allow users of stereo (dual-earpiece or

“double muff”) headsets to hear a monau-

ral version of the two headphone output

channels does not require special wiring

of the 5-pin male XLR mating connector.

The headset’s left headphone channel

should always be wired to pin 4 and the

right headphone channel to pin 5. Con-

ﬁguration choices, discussed later in this

guide, can then be used to create the

Figure 2. Headset connection pinout chart

Model 374 User Guide Issue 2, September 2016

Studio Technologies, Inc. Page 9

desired monaural output. It’s important not

to connect together (short) pins 4 and 5

of the Model 374’s headset connector as

damage to the Model 374’s output circuit-

ry could result.

Monaural (single-earpiece or “single

muff”) headsets should be wired such that

its headphone is wired only to pin 4; pin 5

should be remain unused. The conﬁgura-

tion mode, discussed later in this guide,

can be used to create a monaural output.

It’s possible that some Beyerdynamic in-

terconnecting cable assemblies terminate

the earpiece’s left and right connections

opposite from what the Model 374 and

other broadcast equipment implements.

This may require “ﬂipping” two wires in

a headset’s 5-pin male XLR connector

so that left and right from the Model 374

match correctly.

Dante Conﬁguration

For audio to pass to and from the Model

374 requires that several Dante-related

parameters be conﬁgured. These conﬁgu-

ration settings will be stored in non-volatile

memory within the Model 374’s circuitry.

Conﬁguration will typically be done with

the Dante Controller software application

which is available for download free of

charge at www.audinate.com. Versions

of Dante Controller are available to sup-

port Windows® and OS X® operating

systems. The Model 374 uses the Ultimo

4-input/4-output integrated circuit to imple-

ment the Dante architecture.

The four Dante transmitter (Tx) channels

associated with the Model 374’s Dante

interface must be assigned to the desired

receiver channels. This achieves routing

the Model 374’s four talk output audio

channels to the device (or devices) that

will be “listening” to them. Within Dante

Controller a “subscription” is the term

used for routing a transmitter ﬂow (a

group of output channels) to a receiver

ﬂow (a group of input channels). The num-

ber of transmitter ﬂows associated with an

Ultimo integrated circuit is limited to two.

These can either be unicast, multicast,

or a combination of the two. If the Model

374’s transmitter channels need to be

routed to more than two ﬂows it’s possible

that an intermediary device, such as a

rack-mounted digital signal processor unit

with more available ﬂows, can be used to

“repeat” the signals.

The four Dante receiver (Rx) channels

associated with the Model 374’s audio

inputs also need to be routed to the de-

sired Dante transmitter channels. These

four audio signals will be sent to the Model

374’s 2-channel headphone output.

The Model 374 supports audio sample

rates of 44.1 and 48 kHz with a limited

selection of pull-up/pull-down values

available. In most cases the default will be

used and a pull-up or pull-down rate will

not be selected. The Model 374 can serve

as the clock master for a Dante network

but in most cases it will be conﬁgured to

“sync” to another device.

The Model 374 has a default Dante device

name of ST-M374 and a unique sufﬁx. The

sufﬁx identiﬁes the speciﬁc Model 374 that

is being conﬁgured. The sufﬁx’s actual

alpha and/or numeric characters relate

to the MAC address of the unit’s Ultimo

integrated circuit. The four Dante transmit-

ter (Tx) channels have default names of

Ch1, Ch2, Ch3, and Ch4. The four Dante

receiver (Rx) channels have default names

of Ch1, Ch2, Ch3, and Ch4. Using Dante

Issue 2, September 2016 Model 374 User Guide

Page 10 Studio Technologies, Inc.

Controller the default device name and

channel names can be revised as appropri-

ate for the speciﬁc application.

Model 374 Conﬁguration

Many of the Model 374’s operating pa-

rameters can be conﬁgured to match the

needs of speciﬁc applications. The Model

374 provides four DIP switches of which

three are used to conﬁgure operating func-

tions. Two switches allow the gain of the

microphone preampliﬁer to be adjusted.

One switch selects if a special button back-

light mode is enabled. The fourth switch is

not utilized at this time. A software-based

conﬁguration method is used to select the

talk button modes as well as setting the

way in which incoming audio is routed to

the headphone output channels. The DIP

switches and pushbutton switch that en-

ables conﬁguration are accessible from

the back of the unit’s enclosure through

a rectangular opening that is located

under the top of the belt clip.

The DIP switches are connected to the

Model 374’s logic circuitry which responds

to changes by way of the application ﬁrm-

ware; no audio passes directly through the

switches. Changes made to a DIP switch

will immediately be reﬂected in the unit’s

operation. Changes made to the talk button

modes or headphone audio routing will be

incorporated once the conﬁguration pro-

cess has been completed. A power cycle

is not required for conﬁguration changes

to be recognized and implemented

Accessing the DIP Switches and

Conﬁgure Button

To access the switches and conﬁgure

button requires that the belt clip be

rotated. Normally the belt clip is secured

to the back of the enclosure using one

rivet (non-removable) and one machine

screw that has a thread pitch of 6-32. To

allow the belt clip to rotate, remove the

machine screw using a #1 Phillips head

screw driver. The belt clip should now be

able to rotate in either direction. Save the

screw so that it can be re-installed once

the desired conﬁguration choices have

been made. Note that the threaded fas-

tener within the back of the Model 374’s

chassis has an internal locking mecha-

nism (a plastic bushing) that prevents

the belt clip’s 6-32 machine screw from

vibrating loose. So no additional method

of thread locking, such as a lock washer

or chemical compound, is necessary.

Microphone Preamp Gain

Switches SW1 and SW2 allow the gain of

the microphone preampliﬁer to be select-

ed. When SW1 and SW2 are in their down

(off) position 40 dB of gain is selected.

This will be appropriate for most applica-

tions. (Technically this gain is approxi-

mately equal to the gain provided within

an RTS® BP-325 analog party-line belt-

pack.) Placing SW1 to its up (on) position

while leaving SW2 in its down (off) posi-

tion selects the 43 dB gain setting. Leav-

ing SW1 to its down (off) position while

placing SW2 in its up (on) position selects

the 46 dB gain setting. This additional 3 or

6 dB of gain may be helpful in some ap-

plications, such as with headsets that have

a low microphone output level. The higher

gain settings may also be useful when

the Model 374 is going to be deployed at

events where users are not able to speak

at normal levels, e.g., sporting events

such as golf tournaments.

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