Studio Technologies 206 User's Guide

Model 206 Announcer’s Console
User Guide
Issue 1, April 2018
This User Guide is applicable for serial numbers
M206-00151 and later with application firmware 1.1 and later
Copyright © 2018 by Studio Technologies, Inc., all rights reserved
www.studio-tech.com
50646-0418, Issue 1
ANNOUNCER’S CONSOLE
MODEL 206

Table of Contents

Revision History ........................................................... 4
Introduction ................................................................... 5
Getting Started ............................................................. 10
Operation ...................................................................... 19
Technical Notes ............................................................ 23
Specifications ............................................................... 28
Appendix A: Model 206 Block Diagram ........................ 29
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Revision History

Issue 1, April 2018:
1. Initial release.
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Introduction

The Model 206 Announcer’s Console offers a unique combination of analog and digital audio resources for use in broadcast sports, eSports, live event, entertainment, and streaming broadcast applications. The unit is housed in a compact, rugged steel enclosure that’s intended for table­top use. Calling the Model 206 “cute” or “cool” would be accurate; its nicely propor­tioned but diminutive size makes it ideal for use in space-constrained locations. The Model 206 supports Dante® audio­over-Ethernet digital media technology with AES67 compatibility for integration into contemporary applications. The unit is extremely simple to deploy, is “pro” quality throughout, and provides an intuitive user experience. The Model 206’s audio quality is excellent, with low distortion, low noise, and ample headroom. Careful circuit design and rugged components ensure long, reliable operation.
of many applications. STcontroller, com­patible with version 7 and later of the Windows® operating system, is a fast and simple means of confi the unit’s operating parameters.
rming and revising
Applications
The Model 206 on its own can provide an “all-Dante” solution for one on-air talent location. A wide range of applications can be supported, including sports and enter­tainment TV and radio events, streaming broadcasts, corporate and government AV installations, and post-production facilities. The unit’s small size makes it ideal for live­sports applications, such as basketball, where physical space for personnel is very limited. Four Dante receiver (audio input) channels supply the user with their talent cue (IFB) signals. Should the cue signal
The Model 206 integrates directly into both Dante audio-over-Ethernet and standard analog audio environments. With just a Power-over-Ethernet (PoE) connection, a microphone, and a pair of headphones or an earpiece, a complete broadcast on-air position can be created. And by using the Model 206’s microphone output a direct connection to an analog microphone-level input on an associated camera, remote I/O interface, or audio console can be support­ed. Two remote control inputs allow exter­nal switches or contact closures to activate the main and/or talkback button functions.
Model 206 operating features are con­figured using the STcontroller personal computer software application. An exten­sive set of parameters allows the unit’s functions to be tailored to meet the needs
Figure 1. Model 206 Announcer’s Console front and rear views
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be “mix-minus” an integrated sidetone function can provide the user with a micro­phone confidence signal. Four Dante audio output channels, one designated as main and three named talkback, are routed via an associated local-area network (LAN) to inputs on Dante-compatible devices. Four pushbutton switches, main and three talk­back, provide the user with direct control over audio routing. The audio switching is performed in the digital domain and is virtually “click-free.”
By providing the main audio signal in two forms, Dante digital audio and analog microphone level, the Model 206 makes integration into a wide range of on-air envi­ronments easy to accomplish. And with the three talkback audio channels available as Dante output channels, routing to inputs on a variety of devices, such as matrix intercom systems, audio consoles, and monitor loudspeaker systems, is simple and flexible.
Some applications may benefit from not utilizing the Model 206’s Dante main out­put channel. This typically won’t be an is­sue of inadequate audio quality but rather a need to match work-flow requirements. For example, for lip-sync or transmission purposes it may be optimal to have the on-air audio transported as an embedded signal along with the associated camera video. Alternately, all on-air audio sources may need to connect to inputs on an audio console or console-related I/O unit. Sup­porting these scenarios is not a problem as the Model 206 supplies a microphone output connection that’s specifically intend­ed for this purpose. Simply connect the unit’s microphone output connection to the desired analog input, such as the mic/line input on an ENG-style camera—that’s it!
The circuitry associated with the Model 206’s analog microphone output is very simple, essentially a passive path that routes a signal connected to the micro­phone input connector directly to the microphone output connector. A solid-state circuit, in series with the mic in-to-mic out path, allows muting of the signal on the microphone output connector whenever the Dante main output channel is muted. Having both the Dante main output and the microphone outputs work in tandem can be a valuable resource, allowing one to serve as the primary on-air signal source while the other serves as the backup.
Setup and Operation
Set up, configuration, and operation of the Model 206 is simple. An etherCON® RJ45 jack is used to interconnect with a standard twisted-pair Ethernet port associ­ated with a PoE-enabled network switch. This connection provides both power and bidirectional digital audio. A broadcast headset or handheld (“stick”) microphone can be directly connected to the unit’s 3-pin XLR mic input connector. The input is compatible with dynamic or condenser microphones. The integrated P48 phan­tom power source provides support for a wide range of condenser microphones. A 3-pin XLR microphone output connec­tor provides a “direct mic out” function for integration with microphone inputs on related devices. Stereo headphones, the headphone connections from a stereo or monaural headset, or even a monaural earpiece can be connected to the phones output jack. External switches or contact closures can be connected to the Model 206’s remote control inputs to allow activa­tion of button functions. The STcontroller software application is used to configure the wide range of Model 206 operating
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parameters. This allows the unit’s perfor­mance to be optimized to meet the needs of specific applications.
The user is presented with four pushbutton switches and three push-in/push-out rotary level potentiometers This makes it easy to control the status of the main and talkback outputs as well as adjusting the signals that are sent to the headphone channels.
Ethernet Data and PoE
The Model 206 connects to a local area net­work (LAN) by way of a standard 100 Mb/s twisted-pair Ethernet interface. The physical 100BASE-TX 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 high­reliability environments.
The Model 206’s operating power is provid­ed by way of the Ethernet interface using the 802.3af Power-over-Ethernet (PoE) standard. This allows fast and efficient inter­connection with the associated data network. To support PoE power management, the Model 206’s PoE interface enumerates (reports) to the power sourcing equipment (PSE) that it’s a class 2 (low power) device. If a PoE-enabled Ethernet port can’t be provided by the associated Ethernet switch a low-cost PoE midspan power injector can be utilized.
Dante Audio-over-Ethernet
Audio data is sent to and received from the Model 206 using the Dante audio-over­Ethernet media networking technology. As a Dante-compliant device, the Model 206’s four Dante transmitter (audio output) chan­nels and four Dante receiver (audio input) channels can be assigned (routed or “sub­scribed”) to other devices using the Dante
Controller software 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. An additional LED displays the status of the associated Ethernet connection.
The Model 206 is compatible with the AES67 interoperability standard. In this mode the four transmitter (output) chan­nels will function in multicast; unicast is not supported. In addition, the unit is compat­ible with the Dante Domain Manager™ (DDM) software application.
Audio Quality
The Model 206’s audio performance is completely “pro.” A low-noise, wide dy­namic-range microphone preamplifier and associated voltage-controlled-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-digital conversion (ADC) section that supports sampling rates of
44.1 and 48 kHz with a bit depth of up to
24. The audio signal, now in the digital do­main, routes through a 32-bit microproces­sor and on to the Dante interface section 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 206’s microprocessor. The sup­ported sampling rates are 44.1 and 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
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precise control, and keeps the three level potentiometers from having to directly handle analog audio signals. The audio channels destined for the phones outputs are sent to a high-performance digital-to­analog converter and then on to robust driver circuitry. High signal levels can be provided to a variety of headsets, head­phones, and earpieces.
Configuration Flexibility
The Model 206 can be configured to meet the needs of specific applications and user preferences. All configuration choices are performed using the STcontroller personal computer software application which is compatible with version 7 and later of the Windows operating systems. There are no mechanical switch settings or button-press sequences required to configure how the unit functions. Selectable parameters include microphone preamplifier gain, P48 phantom power on/off, button operation, remote control inputs, headphone output mode, sidetone operation, and overall unit operation. The gain of the microphone preamplifier can be selected from among four choices. This allows the Model 206 to match the output sensitivity of a range of handheld and headset-associated microphones. A low-noise source of P48 phantom power can be enabled if required to support condenser (capacitor) micro­phones.
The main and talkback pushbutton switch­es can be individually configured. The main button can be selected to operate from among four modes while the talk­back buttons can be selected from among three. These choices allow the Model 206’s operation to be tailored to meet the specific needs of many applications. As an example, for on-air sports applications the
main button would typically be configured to provide a push to mute (cough) function. The microphone signal on the Dante main output channel and the microphone output connector would remain active unless the talent needs to momentarily disable it. The talkback buttons would most likely be set to their push to talk modes as their use would be intermittent.
The Model 206 provides two remote con­trol inputs. Configuration choices allow these to be assigned to work in parallel with the main, talkback 1, talkback 2, or talkback 3 pushbutton switches. In this way activation of a remote control input will emulate a user pressing its associated pushbutton switch.
The audio sources and the way in which they are assigned to the headphone output channels can be configured from among five choices. These unique choices allow almost any required headphone monitor­ing situation to be implemented. Whether for use in on-air sports, an awards show broadcast, or as a production support tool, the Model 206 should be able to achieve the desired configuration.
Following the mode number is an abbrevi­ated description of what signal or signals are assigned to the three potentiometers (pots) and on to the two headphone output channels. The potentiometers are labeled A, B, and C, as can be seen in Figure 1 of this guide. The format would equate to Mode x – pot A/pot B/pot C where x equals the mode number.
• Mode 1 – Ch1L/Ch2R/SidetoneLR: Provided for broadcast applications where two monaural channels of tal­ent cueing audio (“IFB”) need to be independently sent to the left and right headphone output channels. It would be
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common for program audio with director interrupt to enter the Model 206 by way of Dante input (receiver) channel 1 and be sent to the left headphone output. Program-only audio, entering the unit by way of Dante input channel 2, would be sent to the right headphone output. Pots A and B are used to adjust the level of those signals. Pot C is used for the side­tone function where microphone audio is sent to both the left and right channels of the headphone output.
• Mode 2 – Ch1LCh2R/BalanceLR/ SidetoneLR: Intended for applications where a stereo signal enters the Model 206 by way of Dante inputs 1 and 2 and is routed in stereo to the left and right channels of the headphone output. In this mode pot A controls the overall level of this stereo signal and the pot B con­trols its left/right level balance. Pot C is used by the sidetone function.
• Mode 3 – Ch1LCh2R/Ch3LCh4R/ SidetoneLR: Allows two stereo signals to be routed as stereo pairs to the two headphone output channels. In this mode pot A adjusts the level of the stereo pair entering the unit by way of Dante inputs 1 and 2 while pot B adjusts the level of the stereo pair entering on Dante inputs 3 and 4. Pot C is used by the sidetone function.
• Mode 4 – Ch1L/Ch2R/Ch3LCh4R: Allows two monaural input signals to be independently routed to the left and right headphone output channels. These audio signals would enter the Model 206 by way of Dante input channels 1 and 2. Pots A and B are used to control the levels of the signals as they are sent to the left and right headphone output
channels. A stereo input signal, entering the unit by way of Dante inputs 3 and 4, are routed to the left and right head­phone outputs. The level of this stereo pair is controlled by pot C.
• Mode 5 – Ch1LR/Ch2LR/Ch3LCh4R: Allows two monaural input audio chan­nels to be sent to both the left and right headphone output channels. Dante inputs 1 and 2 are used to bring these audio signals into the Model 206. Pots A and B are used to control the level of the signals as they are sent to the head­phone output channels. Pot C is used to control the level of a stereo input signal as it is routed to the left and right chan­nels of the headphone output. This ste­reo pair enters the unit by way of Dante inputs 3 and 4.
The integrated sidetone function can be configured to operate from among four choices. This allows audio associated with the microphone input and microphone preamplifier to be returned to the head­phone output. This is important as different applications may provide a “full mix” or a “mix-minus” talent cue signal. If a full mix cue signal is provided then sidetone audio will not be needed and the function can be disabled. In the case where a mix-minus signal is present, providing the user with sidetone at the appropriate time(s) can be an important means of confirming the signal that’s coming from the connected microphone.
The headphone gain range configura­tion helps to provide an optimized audio level to Model 206 users. The appropriate setting will depend on the specific audio sources provided to the unit as well as user preference.
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Three system modes select the overall way in which the Model 206 functions. The on-air mode is optimized for applications where users will be on-air talent that must maintain strict separation between on-air and production audio channels. Other applications will benefit from the two available production modes.
Future Capabilities and Firmware Updating
The Model 206 was designed so 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 206 uses the Audinate 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 206 Announcer’s Console and a printed copy of this guide. As a device that is Power-over-Ethernet (PoE) powered, no external power source is provided. In most applications an Ethernet switch with PoE capability will be utilized. If that’s not available a PoE midspan power injector can be used.
An Ethernet data connection with Power­over-Ethernet (PoE) capability will be made using either a standard RJ45 patch cable or an etherCON protected RJ45
A microphone will be connected
plug. using a cable-mounted 3-pin male XLR connector. A set of headphones or an earpiece will be connected by way of a ¼-inch plug. If desired, the Model 206’s microphone-level output may be interfaced with other equipment using a cable termi­nated with a standard 3-pin female XLR connector. Special applications may utilize the two remote control inputs that are ac­cessible using a 3.5 mm 3-conductor jack.
Ethernet Connection with PoE
100BASE-TX Ethernet connection that
A supports Power-over-Ethernet (PoE) is required for Model 206 operation. connection will provide both the Ethernet data interface and power for the Model 206’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 206 supports Ether­net switch power management, enumerat­ing itself as a PoE class 2 device.
The Ethernet connection is made by way of a Neutrik etherCON protected RJ45 connector that is located on the back of the Model 206’s enclosure. This allows connection by way of a cable-mounted etherCON connector or a standard RJ45 plug. The Model 206’s Ethernet interface supports auto MDI/MDI-X so that a “cross­over” or “reversing” cable will never be required.
This one
Connections
In this section signal interconnections will be made using the five connectors located on the back of the Model 206’s enclosure.
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Ethernet Connection without PoE
As previously discussed in this guide, the Model 206 was designed such that the Ethernet connection will provide both data
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and Power-over-Ethernet (PoE) power. There may be situations where the as­sociated 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 802.3af­compatible it should function correctly. Midspan units are available from a variety of sources, including many online retailers.
Microphone Input
The Model 206 provides a 3-pin female XLR connector that allows a balanced dynamic or phantom powered condenser powered microphone to be connected. The microphone can be a standalone handheld (“stick”) type or can be part of a broadcast­style headset. The Model 206’s microphone input is directly compatible with balanced dynamic or P48 phantom powered micro­phones. A microphone should be connected such that its associated XLR connector has pin 1 as common, pin 2 as signal high (+), and pin 3 as signal low (–). A configura­tion setting allows the P48 phantom power source to be enabled or disabled as de­sired. Details on configuration settings will be described later in this guide.
While the Model 206 provides an excellent source of P48 phantom power, it’s possible that an input on an associated piece of equipment is already providing microphone power. This could be connected to the Model 206 by way of the microphone output connector. This would not create a problem since the circuitry that connects audio from the Model 206’s microphone output connector to the Model 206’s microphone input connector will pass this microphone power through without interruption. This situation could be relevant when the Model 206’s microphone output connector is interfaced with the microphone input on a broadcast camera, audio console,
microphone mixer, or similar equipment. Inputs on these devices would typically offer phantom power which in some cases may have been enabled.
Headphone Output
The Model 206 provides a 2-channel headphone output interfaced by way of a 3-conductor ¼-inch phone jack. Devices such as stereo headphones or stereo (“dual-muff”) broadcast-style headsets can be directly connected using a 3-conductor ¼-inch plug. Following the usual conven­tion the left channel should be terminated on the tip lead, the right channel on the ring lead, and common on the sleeve lead.
It’s also possible to use a monaural (“single-muff”) headset or broadcast-type single earbud but in these cases care must be taken. If a 3-conductor ¼-inch plug is used by a device it should be wired to the tip and sleeve leads; the plug’s ring lead should be left unconnected. But it’s also possible that the monaural device will be terminated on a 2-conductor (“tip and sleeve”) plug. When the plug is inserted into the Model 206’s headphone jack the Model 206’s right headphone output chan­nel will be shorted; the ring lead will be directly connected to the sleeve lead. This can lead to stress on the right channel headphone output circuitry as well as extra current draw. To prevent this undesirable condition ensure that no input audio signal is routed to the right headphone output channel. Refer to the Configuration section later in this guide for details on setting the headphone audio routing to best accom­plish this condition.
Microphone Output
3-pin male XLR connector provides a
A microphone-level output that’
s directly re-
lated to the microphone input. Technically
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the output is identical to the signal that’s connected to the microphone input but with a solid-state muting circuit in series with the interconnection. When the Model 206’s Dante main output channel is active the microphone signal will also pass through to the Model 206’s microphone output connec­tor. Whenever the Dante main output chan­nel is muted the microphone signal does not pass through to the microphone output connector; it is muted in an essentially click-free manner. Refer to Appendix A for a block diagram of the microphone input and microphone output circuitry.
The microphone output can be connected to balanced (differential) analog micro­phone-level inputs on a variety of devices. This includes microphone input connec­tions on remote I/O interfaces associated with a networked audio console. An ex­ample of such an interface would be the Calrec® Hydra2®. The mic inputs on these devices typically offer microphone power, high-quality amplification, and conversion to the digital domain. The output signals of the interface’s pre-amp channels are trans­ported to the main electronics or console surface using a fiber optic interface. In this type of application the Model 206’s Dante main output channel would not be used or would only be used as a backup path.
signal vis-à-vis a directly connected micro­phone signal but shouldn’t impact any real­world applications.
Remote Control Inputs
Provision has been made to allow exter­nal switches or contact closures to mimic operation of any two of the four pushbut­ton switches (main, talkback 1, talkback 2, and talkback 3). The exact functioning of the two remote control inputs is determined by configuration settings, details of which are discussed later in this guide. A 3.5 mm 3-conductor jack is located on the Model 206’s back panel and provides access to the two remote control inputs. The input circuitry is “active low,” with 3.4 k ohm re­sistors connected to +3.3 volts DC to act as input “pull ups.” (In addition, a combination of resistors and capacitors provide ESD protection, minimizing the chance of dam­age due to static discharge or other extra­neous signals.) A current flow of less than one milliampere is required for a remote control input to be recognized as active.
Prepare the interconnecting cable and associated 3.5 mm 3-conductor plug to reflect that the tip lead is used by remote control input 1, the ring lead by remote control input 2, and the sleeve lead is the connection to common.
No preamplifier or other active circuitry impacts the path from the Model 206’s microphone input connector to the Model 206’s microphone output connector. But the signal does pass through a 200 ohm resis­tor in each “leg” (pin 2 and pin 3) along with connecting to a solid-state relay contact. The result is that the source impedance of a connected microphone will be 400 ohms greater when presented to the microphone output connector. This will slightly raise the theoretical noise floor of the microphone
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Dante Configuration
For audio to pass to and from the Model 206 requires that several Dante-related parameters be configured. These configu­ration settings will be stored in non-volatile memory within the Model 206’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 support Windows and OS X® operating systems.
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The Model 206 uses the Ultimo 4-input/ 4-output integrated circuit to implement the Dante functionality. The Model 206 can also be configured to meet the requirements of the AES67 standard. This requires a setting to be enabled within the Device Info section of the Dante Controller application.
The four Dante transmitter (Tx) channels associated with the Model 206’s Dante interface must be assigned to the desired receiver channels on associated equip­ment. This achieves routing the Model 206’s four 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 num­ber 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 206’s four transmitter channels need to be routed to more than two flows it’s possible that an intermediary device with enhanced flow capability, such as the Studio Technologies Model 5422 Dante Intercom Audio Engine, can be used to “repeat” the signals.
The desired audio sources need to be routed to the receiver (Rx) channels as­sociated with the Model 206’s Dante audio inputs. The unit provides four audio input channels. The number utilized will depend on the specific application. Following the unit’s headphone source and routing con­figuration selection these audio signals will be sent to the Model 206’s 2-channel head­phone output.
The Model 206 supports audio sample rates of 44.1 and 48 kHz with no pull-up/ pull-down values available. In most cases it’s anticipated that the default rate of 48
KHz will be appropriate. While technically the Model 206 can serve as a clock master for a Dante network (as can all Dante­enabled devices) in virtually all cases the unit will be configured to receive “sync” from another device.
The Model 206 has a default Dante device name of ST-M206 along with a unique suffix. The suffix identifies the specific Model 206 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 transmitter (Tx) audio output channels have default names of Main, Talkback 1, Talkback 2, and Talkback 3. The four Dante receiver (Rx) audio input channels have default names of Headphone Ch1,
Headphone Ch2, Headphone Ch3, and Headphone Ch4. Using Dante Control-
ler the default device name and channel names can be revised as appropriate for the specific application.
Model 206 Configuration
The STcontroller software application is used to configure the way in which the Model 206 functions. No DIP switch settings or other local actions are used to configure the unit. This makes it imperative that STcontroller be available for convenient use in a personal computer that’s connect­ed to the related LAN.
The configurable functions include:
• P48 phantom power on/off status
• Microphone input gain
• Headphone audio sources and routing
• Headphone gain range and minimum level
• Sidetone
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• Main and talkback button operating modes
• System operating mode
• Remote control inputs
• Button backlight intensity
Changes made using STcontroller will be immediately reflected in the unit’s opera­tion; no Model 206 “reboot” is required. Each time a change is made the main and talkback buttons on the front panel will momentarily flash orange in a distinctive pattern to indicate that a command from STcontroller has been received.
Installing STcontroller
STcontroller is available free of charge on the Studio Technologies website (www. studio-tech.com/stcontroller) and is com­patible with personal computers running Windows operating systems that are version 7 and later. STcontroller versions
1.05.00 and later will fully support the Mod-
el 206. If required, download and install STcontroller onto a designated personal computer. This personal computer must be on the same local area network (LAN) and subnet as the Model 206 unit or units that are to be configured. Immediately after starting STcontroller the application will locate the devices that it can control. The one or more Model 206 units to be config­ured will appear in the device list. Use the identify command to allow easy recogni­tion of a specific Model 206 unit. Double­clicking on a device name will cause the associated configuration menu to appear. Review the current configuration and make any changes that are desired.
P48 Phantom Power
STcontroller allows selection of the on/of
f status of the microphone input’s P48 phantom power source. The on/of
f
status is displayed by way of an LED, red in color, located on the back panel adja­cent to the microphone input connector. Select the status of the P48 source to meet the needs of the connected micro­phone. No problem will occur if an external source of P12 or P48 phantom power is present on the connection made to the microphone output connector. In this case simply turn off the Model 206’s P48 phan­tom power source. The external source of microphone power will “pass thru” from the microphone output connector to the micro­phone input connector.
Microphone Input Gain
The gain of the Model 206’s microphone preamplifi
er can be selected from among four choices: 35, 43, 52, and 59 dB. The compressor active LED, orange in color and visible on the back of the Model 206’s enclosure adjacent to the microphone input connector, can act as a guide when setting the preamp gain. When a voice signal at a normal level is present on the microphone input the compressor active LED should light intermittently. If, for example, it rarely lights and the gain is set to 43 dB, it might be a good idea to change the setting to 52 dB. If the LED is lit fully during normal talking and the gain is set for 52 or 59 dB, changing it to one of the lower values might be warranted. There’s no “hard and fast” rule about which gain setting is appropriate. But unless otherwise indicated, 43 dB is typically a good initial choice.
Headphone Audio Sources and Routing
STcontroller allows selection from among five headphone audio source and routing modes. Each mode is distinct and care­ful selection will help optimize the Model 206’s operation for a range of applications.
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Mode 1 – Ch1L/Ch2R/SidetoneLR
Mode 1 is provided for on-air applications where two independent audio sources need to be routed separately to the two headphone output channels. Dante input (receiver) channel 1 will be routed to the left headphone output channel and pot A will adjust its level. Dante input (receiver) channel 2 will be routed to the right head­phone output channel and pot B will adjust its level. Pot C will adjust the level of the sidetone audio as it is sent to both the left and right headphone output channels.
Mode 2 – Ch1LCh2R/BalanceLR/ SidetoneLR
Mode 2 is provided for stereo applications that could include live music events that are distributed via streaming audio or by way of an over-the-air broadcast. In these applica­tions it’s typical to want the user to have a single potentiometer to simultaneously adjust the level of a stereo pair while a separate potentiometer is used to adjust the left/right level balance.
When set for Mode 2 Dante input chan­nel 1 will be routed to the left headphone output channel and Dante input channel 2 will be routed to the right headphone output channel. Pot A will adjust the overall level of both headphone output channels. Pot B will adjust the level balance between the left and right output channels. Pot C will adjust the level of the sidetone audio as it is sent to both the left and right headphone output channels.
Mode 3 – Ch1LCh2R/Ch3LCh4R/ SidetoneLR
Mode 3 can be useful in applications where two stereo signals need to be provided to the user on the left and right headphone output channels. In this mode Dante input channels 1 and 2 are routed to the left and
right channels of the headphone output. Pot A adjusts the level of this stereo pair. Dante input channels 3 and 4 are also routed to the left and right channels of the headphone output. Pot B adjusts the level of this stereo pair as it is sent to the head­phone output channels. Pot C will adjust the level of the sidetone audio as it is sent to both the left and right headphone output channels.
Mode 4 – Ch1L/Ch2R/Ch3LCh4R
Mode 4 is very similar to mode 1 except instead of providing sidetone another ste­reo pair can be routed to the left and right headphone output channels. Dante input channel 1 is routed to the left channel of the headphone output and pot A adjusts its level. Dante input channel 2 is routed to the right headphone output channel and pot B adjusts its level. A stereo pair can enter the Model 206 by way of Dante input channels 3 and 4. These signals, whose level is adjusted using pot C, are sent to the left and right channels of the head­phone output.
Mode 5 – Ch1LR/Ch2LR/Ch3LCh4R
Model 5 is a unique variation where two monaural signals can be routed to both the left and right headphone output chan­nels while a stereo input source is routed in stereo to the headphone output chan­nels. Dante input channel 1 will be routed to both the left and right channels of the headphone output. Its level is controlled by pot A. Dante input channel 2 will also be routed to both the left and right chan­nels of the headphone output. Its level will be adjusted using pot B. A stereo pair can enter the Model 206 by way of Dante input channels 3 and 4. These signals will be sent, in stereo, to the left and right chan­nels of the headphone output. Their level will be adjusted using pot C.
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Headphone Gain Range
The overall level of the headphone output can be confi
gured as desired for specific applications. The default setting, low, is designed so that users with typical audio input sources will be inclined to set the rotary potentiometers at approximately 50% of rotation. This would be appropriate for most applications. The high setting would be applicable in cases where an extreme headphone output level is required or the audio input sources are providing a level that is lower than typical. Using the high setting in the former application is not rec­ommended as hearing damage could result from exposure to high signal levels.
Headphone Minimum Level
setting in STcontroller is used to config-
A ure the headphone output’
s minimum level. In the –40 dB setting the minimum head­phone output level is approximately 40 dB below its maximum; the headphone output channels will never fully mute. This ensures that any audio signal present on the uti­lized Dante input channels will always be present on the headphone output. In most on-air broadcast applications this is the ap­propriate setting, ensuring that a minimum amount of signal is always present. When full mute is selected moving a level potenti­ometer to its fully counterclockwise position will cause its associated headphone output channel (or channels) to fully mute. If a potentiometer is set to serve as a balance control, moving it to either its fully coun­terclockwise or fully clockwise position will cause the associated signal to fully mute. Selecting the full mute mode may be ap­propriate for applications where minimizing the chance of audio “leakage” is important. This could occur when during an event the connected headset or headphones are at times placed on a desk or tabletop.
Note that the action of pot C when con­figured to provide the sidetone function (headphone modes 1, 2 or 3) will never be impacted by the setting for the headphone minimum level. Whenever pot C is control­ling the sidetone level it will always cause the signal to fully mute when it’
s set to fully
counterclockwise.
Sidetone Mode
controller allows the Model 206’s side-
ST tone function to be configured as desired. Sidetone is audio from the microphone input that is sent to the headphone output chan­nels.
This can be important, allowing the user to “hear” themselves for performance confirmation and comfort. Making a specific selection from among the four available modes will depend on the needs of the ap­plication. If a “full mix” is being provided to the Model 206’s Dante inputs then locally provided sidetone won’t be needed and the off configuration should be selected. The user will hear themselves by way of audio signals being routed to the Dante input channels. But if “mix-minus” audio is being supplied to the Model 206 then selecting a headphone source and routing modes which enables sidetone (headphone modes 1, 2, or 3) can be an important means of establishing user confidence. Then the sidetone mode configuration will establish exactly when sidetone audio will be sent to the headphone output channels.
Four sidetone modes are available:
• Off: In this mode the sidetone function
is not active.
• Main Button: In this mode the sidetone
function will be active whenever the audio signal associated with the microphone input is present on the Dante main output channel and the microphone output connector.
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• Talkback Buttons: In this mode the side­tone function will be active whenever one or more of the talkback functions are active and the audio signal is present on the talkback 1, talkback 2, and/or talk­back 3 Dante output channels.
• Main and Talkback Buttons: In this mode the sidetone function will be active when­ever the audio signal associated with the mic input is present on the Dante main output channel and the microphone out­put connector. The sidetone function will also be active whenever one or more of the talkback functions are active.
Button Operation – Main
controller allows the configuration of the
ST main button to be selected. There are four mode choices available:
Push to Mute: If this mode is selected the main button function will normally be active and its green LED lit. The audio signal associated with the microphone in­put will be routed to both the Dante main output channel and the microphone out­put connector. Whenever the main button is pressed the audio signal will mute on both the Dante main output channel and the microphone output connector; the button’s LED will change from green to red.
• Push to Talk: If this mode is selected the main button function will normally be inactive and the button’s red LED will be lit. The audio signal associated with the microphone input will not be routed to the Dante main output channel and the mi­crophone output connector will be muted. Whenever the main button is pressed the audio signal will become active on the Dante output channel and the micro­phone output connector. In addition, the button’s green LED will light.
• Latching: If this mode is selected the main button’s function will alternate between its active and inactive states whenever the main button is pressed. Upon power up the function will be in its inactive state and the red LED associated with the button will be lit.
• Push to Talk/Tap to Latch: This mode is a combination of the push to talk and latching modes. It’s similar to the way talk pushbutton switches function on user stations associated with broadcast or production intercom systems. If the main button is pressed and held the main button’s function will be active. It will stay active until the main button is released. If the main button is momentarily “tapped” the main button’s status will change, either from inactive-to-active or from ac­tive-to-inactive. Upon Model 206 power up the main button will be in its inactive state and its red LED will be lit.
Button Operation – Talkback
The manner in which the three talkback buttons function can be configured. One setting applies to both talkback buttons. There are three mode choices available:
• Push to Talk: If this mode is selected the talkback functions will normally be inac­tive and the LED associated with each button will not be lit. Whenever a talkback button is pressed its associated talkback function will become active and its green LED will light.
• Latching: If this mode is selected the talkback functions will alternate between their active and inactive states whenever a talkback button is pressed. Upon power up the talkback functions will be in their inactive state and their button LEDs will not be lit.
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• Push to Talk/Tap to Latch: This mode is a combination of the push to talk and latching modes. It’s similar to the way talk pushbutton switches function on user stations associated with broadcast or production intercom systems. If a talkback button is pressed and held its talkback function will be active. It will stay active until the talkback button is released. If a talkback button is momen­tarily “tapped” the status of the function will change, either from inactive-to-active or from active-to-inactive. Upon Model 206 power up the talkback buttons will be in their inactive state and their LEDs will not be lit.
System Operating Mode
The system mode configures the overall manner in which the Model 206 operates. Specifically, it determines how the Dante main output channel and the microphone output connector operate vis-à-vis the talkback functions. The system mode can also impact one facet of the headphone output’s function. There are three system modes available. Understanding how each specifically impacts Model 206 operation will help to ensure that the desired opera­tion is obtained and that maximum usabil­ity will occur.
On-Air
When selected to the on-air mode, audio on the Dante main output channel and the microphone output connector will always mute whenever the talkback 1, talkback 2, or talkback 3 functions are active. The on­air mode should be selected for all on-air broadcast applications when it’s impera­tive that the “on-air” audio signal be muted whenever on-air talent uses a talkback function to communicate with production personnel.
Production
When the system mode is set for produc­tion, the audio signals on the Dante main output channel and microphone output connector are never muted in response to talkback function activity. The mic off/off function operates independently of the talkback functions. This mode allows the Dante main output channel to be used, for example, as an additional talkback output. In this way the Dante main output channel and the three talkback output channels can be used separately and not impact each other. This also allows both the main and talkback pushbuttons to be used simulta­neously. When selected for the correct ap­plication, the production mode can prove to be very useful. But it’s not appropriate for on-air use!
Production with Dim
This mode is identical to the production mode with the exception that the head­phone output reduces in level (“dims”) whenever the main, talkback 1, talkback 2, or talkback 3 functions are active. This mode was specifically provided to mini­mize the chance that acoustical feedback will occur in applications where the head­phone output is connected to the inputs on amplified speakers (or inputs on an ampli­fier associated with loudspeakers). In this mode the level of the headphone output channels is reduced by 18 dB whenever a main or talkback function is active. This mode is not appropriate when headphones are going to be connected to the Model 206!
Remote Control Inputs
There are two remote control inputs. They can be individually configured to mimic the action of one of the pushbutton switches. The choices are off, main button,
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talkback 1 button, talkback 2 button, or talkback 3 button.
Button Backlight Intensity
The caps (top surfaces) of the four push­button switches are able to be lit using in­ternal LEDs, one red and one green. When they light and with what color depends on the configuration of the Model 206 and the current operating condition. The intensity of these LEDs can be adjusted to meet the needs of an application, specifically being configured to perform optimally vis-à-vis the amount of ambient light present in the Model 206’s location. The choices are low and high.

Operation

At this point all connections and configura­tion steps should have been completed and everything should be ready for Model 206 operation to commence. An Ethernet con­nection with Power-over-Ethernet (PoE) capability should have been made. Alter­nately, a midspan power injector, in “se­ries” with the Ethernet connection, should have been put into place. A microphone and headphones or earbud should have been connected. Alternately, a broadcast­style headset may have been connected. If desired, a connection to the microphone output should have been made. Some ap­plications may utilize either or both of the remote control inputs.
The Model 206 should have been placed in the desired physical location. Using the Studio Technologies STcontroller software application the unit’s configuration should have been selected to meet the needs of the specific application. The Model 206’s Dante configuration settings should have been selected using the Dante Controller
software application. In this way the unit’s four Dante audio output channels (Dante transmitter channels) and four Dante audio input channels (Dante receiver channels) should have been routed, by way of Dante “subscriptions,” to the receiver and trans­mitter channels on associated Dante­enabled equipment.
Initial Operation
The Model 206 will start to function as soon as a Power-over-Ethernet (PoE) power source is connected. However, it may take 20 to 30 seconds for full opera­tion to commence. Upon initial power up the three status LEDs, located on the back panel below the RJ45 jack, will begin to light as network and Dante connections are established. The COMP LED, adjacent to the microphone input connector, may or may not flash momentarily. The P48 LED, also located adjacent to the microphone input connector, will flash once to indicate that it is functioning. The red and green LEDs within the main and talkback push­button switches will light in a short test sequence to indicate that the application firmware (embedded software) has started. Once that sequence has completed and the Dante connection has been estab­lished full operation will begin. The vari­ous LEDs will then become operational, displaying the status of their designated functions.
How to Identify a Specific Model 206
Functions within the Dante Controller and STcontroller software applications allow a specific Model 206 unit to be identified. Each application provides an “eyeball” icon that when clicked will activate the identify function. When identify is selected it will
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send a command to a specific Model 206 unit. On that unit the LEDs associated with the main and talkback pushbutton switch­es will “flash” orange approximately eight times (the actual on/of tons will not change). In addition, the SYS and SYNC status LEDs, located directly below the etherCON RJ45 connector on the back panel, will slowly flash green. After a few seconds the LED identification pattern will cease and normal Model 206 button LED and Dante status LED opera­tion will resume.
f status of the but-
Ethernet and Dante Status LEDs
Three status LEDs are located below the etherCON RJ45 connector on the Model 206’s back panel. The LINK ACT LED will light green whenever an active connection to a 100 Mb/s Ethernet network has been established. It will then flash in response to all Ethernet data packet activity. The SYS and SYNC LEDs display the operating sta­tus of the Dante interface and its associat­ed network activity. The SYS LED will light red upon Model 206 power up to indicate that the Dante interface is not ready. After a short interval it will light green to indicate that it is ready to pass data with another Dante device. The SYNC LED will light red when the Model 206 is not synchronized with a Dante network. It will light solid green when the Model 206 is synchronized with a Dante network and an external clock source (timing reference) is being received. It will slowly flash green when this specific Model 206 is part of a Dante network and is serving as the clock mas­ter. It’s possible that up to 30 seconds may be required for the SYNC LED to reach its final state.
P48 Status LED
An LED indicator is located on the back panel adjacent to the microphone input connector. It is labeled P48 and will light red whenever the P48 phantom power source is active and providing power to the microphone input.
Compressor Active LED and Mic Preamp Gain
An LED indicator, orange in color, is locat­ed on the back panel, also adjacent to the microphone input connector. It is labeled COMP and displays the status of the microphone audio compressor function. This function controls the dynamic range of the audio signal that can be present on the Dante audio output (transmitter) channels and sidetone audio sent to the headphone output versus the signal present on the microphone input. The compressor LED will light whenever the input level from the microphone, along with the configured microphone preamplifier gain, is such that the dynamic range of the signal is being actively controlled. It’s perfectly acceptable for this LED to light intermittently whenever a user is talking at a normal voice level into an associated microphone. But if the COMP LED lights solid while a user is talk­ing at a normal voice level this will typically indicate that the microphone preamplifier gain setting should be reduced. Converse­ly, if the COMP LED almost never lights when normal talking is taking place, it’s possible that changing the gain to a higher value would be beneficial. Note that due to the design of the circuitry the compressor active LED will function whether or not the main or talkback functions are active. Also, the compressor function does not impact the microphone output connector.
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Main and Talkback Buttons
Four pushbutton switches are used to select how the microphone signal is routed to the four Dante output channels and the micro­phone output connector. The button labeled MAIN controls if the audio signal associated with the microphone input will be present on the Dante main output channel and the microphone output connector that’s located on the back panel of the Model 206. How the button functions will depend on the con­figuration choice that has been made using STcontroller. When the main button’s green LED is lit audio will be present on both the Dante main output channel and the micro­phone output connector. When the main button’s red LED is lit audio will not be present on the Dante main output channel and the audio signal associated with the microphone output connector will be muted.
The talkback functions allow the audio as­sociated with the microphone input to be routed to one or more of the Dante talkback output channels. When a talkback function is active its green LED will be lit. How a talkback button will specifically function and whether it impacts the main button’s func­tioning depends on the Model 206’s system configuration.
Main Button Modes
There are four ways that the main pushbut­ton switch can function. The way in which it specifically operates depends on its select­ed configuration.
• Push to Talk: If this mode is selected the audio signal associated with the Dante main output channel and the microphone output connector will be normally muted. The audio signal will become active whenever the main pushbutton is pressed and held.
Latching: If this mode is selected the audio signal associated with the Dante main output channel and the microphone output connector will alternate between the active and muted states whenever the main pushbutton is pressed. Upon Model 206 power up the audio signal will be in its muted state.
• Push to Talk/Tap to Latch: This mode is a combination of the push to talk and latch­ing actions. It’s similar to the way in which talk pushbuttons function on user stations associated with broadcast or production intercom systems. If the main pushbut­ton is pressed and held the audio signal associated with the Dante main output channel and the microphone output con­nector will become active and remain ac­tive until the pushbutton is released. If the main pushbutton is momentarily “tapped” the audio signal will change state. Upon Model 206 power up the audio signal will be in its muted state.
Talkback Button Modes
Depending on the selected configuration, the talkback pushbuttons will function in one of three possible modes:
• Push to Mute: If this mode is selected the audio signal associated with the micro­phone input will normally be active on the Dante main output channel and the micro­phone output connector. The audio signal will mute whenever the main pushbutton
• Push to Talk: If this mode is selected the audio signal associated with a Dante talk­back output channel is normally muted. The audio signal will become active whenever its associated talkback push­button is pressed and held.
is pressed and held.
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• Latching: If this mode is selected the audio signal associated with a Dante talkback output channel will alternate between its active and muted states whenever its associated talkback push­button is pressed. Upon Model 206 power up the Dante talkback output channels will be in their muted state.
• Push to Talk/Tap to Latch: This mode is a combination of the push to talk and latch­ing actions. If a talkback pushbutton is pressed and held the audio signal associ­ated with its associated Dante talkback output channel will become active until the pushbutton is released. If a talkback pushbutton is momentarily “tapped” the audio signal on its associated Dante talkback output channel will change state. Upon Model 206 power up the audio sig­nals on the Dante talkback output chan­nels will be in their muted state.
Remote Control Inputs
The Model 206 allows two switches or con­tact closures to be connected to the remote control inputs. Whether or not they are utilized will depend on the selected applica­tion. If signals are connected to either or both of the remote control inputs how they function will depend on the configuration settings. The configuration selections are performed using STcontroller with the de­fault setting for both remote control inputs being off. The remote control inputs can be individually configured to duplicate the action of one of the pushbutton switches with choices of main, talkback 1, talkback 2, or talkback 3. When a remote control input is enabled it will cause an action identical to that caused by pressing or tapping the related pushbutton switch. For example, if remote control input 1 is assigned to the main pushbutton function and that pushbut­ton is configured for latching mode, remote
control input 1 will also function in a latching manner.
System Operating Mode
The system operating mode confi
guration is used to select the overall operating mode of the Model 206. Specifi
cally, the system operating mode determines how the main function will operate vis-à-vis the talkback functions. In addition, the system operating mode will also determine if the level of the headphone output is impacted by push­button activity. Understanding how the three system operating modes impact overall sys­tem operation will ensure correct operation and maximum usability.
• On-Air: When the system operating mode
has been selected to on-air the main but­ton will be forced to be inactive whenever a talkback function is active. The on-air mode will be appropriate for all on-air broadcast applications where it’s impera­tive that the audio signal on the Dante main output channel and microphone output connector be muted whenever on-air talent uses a talkback function to communicate with production personnel.
• Production: When set for the production
operating mode the status of the main button will never be impacted by the status of a talkback function. This mode allows the Dante main output channel to be used, for example, as an additional talkback output. In this way the Dante main and talkback output channels can be used independently, with activation of any of them not impacting any of the others. This also allows all four push­button switches to be used simultane­ously. When selected for the appropri­ate application, the production operating mode can prove to be very useful. But it’s not appropriate for on-air use!
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• Production with Dim: This operating mode functions exactly as the production operating mode does with one addition. The level of the headphone output is dimmed (reduced in level or attenuated) by 18 dB whenever one of the main or talkback functions are active. In this way the headphone output can be connected to amplified loudspeakers without the risk of acoustical feedback. The selection of this operating mode will be clearly evident as speakers (or a connected set of head­phones) will be automatically reduced in level whenever the main, talkback 1, or talkback 2 functions are active.
Headphone Output
The three rotary potentiometers (pots), located on the Model 206’s front panel, allow level adjustment of the Dante audio input channels and, if enabled, the sidetone (local microphone) audio signal as they are sent to the 2-channel headphone out­put. How the potentiometers function will depend on the selected audio sources and routing configuration. Refer to the Configu­ration section of this guide for details. Five modes are available and determine the overall performance. If headphone mode 1, 2, or 3 is selected pot C, located on the right side, will adjust the sidetone level. The sidetone mode configuration determines exactly how the sidetone function will oper­ate. The gain range configuration allows the overall output level to be selected. The minimum level configuration will determine what occurs when the potentiometers are in their fully counterclockwise position and, in one circumstance, its fully clockwise posi­tion. When pot C is configured for sidetone operation it will always cause the sidetone audio to mute if it is set to its fully counter­clockwise position
Users should find the headphone audio quality to be excellent, with high maximum output level and low distortion. Analog audio signals do not pass directly through the potentiometers. The position of each potentiometer is recognized by the Model 206’s processor which then adjusts the appropriate signal level within the digital domain. The potentiometers are “push-in/ push-out” type which allow their associated knobs to be in their “out” position when adjustment is desired and their “in” position when protection from an unwanted change is beneficial.

Technical Notes

IP Address Assignment
By default the Model 206’s Ethernet inter­face will attempt to automatically obtain an IP address and associated settings using DHCP (Dynamic Host Configura­tion Protocol). If a DHCP server is not detected an IP address will automatically be assigned using the link-local protocol. This protocol is known in the Microsoft® world as Automatic Private IP Addressing (APIPA). It is also sometimes referred to as auto-IP (PIPPA). Link-local will random­ly assign a unique IP address in the IPv4 range of 169.254.0.1 to 169.254.255.254. In this way multiple Dante-enabled devices can be connected together and auto­matically function, whether or not a DHCP server is active on the LAN. Even two Dante-enabled devices that are directly interconnected using an RJ45 patch cord will, in many cases, correctly acquire IP addresses and be able to communicate with each other.
An exception does arise when trying to directly interconnect two Dante-enabled
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devices that use Ultimo integrated circuits to implement Dante. The Model 206 uses Ultimo and, as such, a direct one-to-one interconnection to another Ultimo-based product is not supported. An Ethernet switch linking the two units is required to successfully interconnect two Ultimo­based devices. The technical reason that a switch is required relates to the need for a slight latency (delay) in the data flow; an Ethernet switch will provide this.
Using the Dante Controller software ap­plication the Model 206’s IP address and related network parameters can be set for a fixed (static) configuration. While this is a more involved process than simply letting DHCP or link-local “do their thing,” if fixed addressing is necessary then this capabil­ity is available. But in this case it’s highly recommended that every unit be physically marked, e.g., directly using a permanent marker or “console tape,” with its specific static IP address. If knowledge of a Model 206’s IP address has been misplaced there is no reset button or other method to easily restore the unit to a default IP setting.
In the unfortunate event that a specific Model 206’s IP address is “lost,” the Address Resolution Protocol (ARP) net­working command can be used to “probe” devices on a network for this information. For example, in Windows OS the arp –a command can be used to display a list of LAN information that includes MAC ad­dresses and corresponding IP addresses. The simplest means of identifying an un­known IP address is to create a “mini” LAN with a small PoE-enabled Ethernet switch connecting a personal computer to the Model 206. Then by using the appropriate ARP command the required “clues” can be obtained.
Optimizing Network Performance
For best Dante audio-over-Ethernet perfor­mance a network that supports VoIP QoS (voice-over-internet-protocol quality of ser­vice) capability is recommended. This can typically be implemented on virtually all contemporary managed Ethernet switches. There are even specialized switches that are optimized for entertainment-associated applications. Refer to the Audinate website (www.audinate.com) for details on optimiz­ing networks for Dante applications.
Application Firmware Version Display
There are two ways in which the version number of the Model 206’s application firmware (embedded software) can be identified. One requires only the Model 206 unit and involves a button-press sequence performed upon power up. The other method utilizes the Model 206 and the STcontroller software application. Ei­ther method may prove to be useful when working with factory personnel on applica­tion support and troubleshooting.
As part of the Model 206’s power-up sequence the unit’s application firmware can be directly displayed. Before connect­ing the PoE-enabled Ethernet cable, press and hold the talkback 3 button. Then con­nect the Ethernet cable. Upon application of PoE power the Model 206 will not go through its normal power-up sequence but instead will display the firmware version. The green LED associated with the main button will “flash” to display the major ver­sion number. Then the red LED associated with talkback 1 will “flash” to display the minor version number. The LEDs will then remain off until the talkback 3
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button is released. Once the talkback 3 button is released normal operation will then take place. As an example of what would be a typical firmware display, if the main button’s LED “flashes” green once followed by the talkback 1 button’s LED “flashing” red twice it would indicate that application firmware version 1.2 is present in the Model 206.
A selection in the STcontroller software application allows the Model 206’s ap­plication firmware version to be identified. Connect the Model 206 unit to the network and let it connect and start to function. Then, after starting STcontroller, review the list of identified devices and select the specific Model 206 from which you want to determine its application firmware version. Then select Version under the Device tab. A page will then display that will provide lots of useful information. This includes the application firmware version and well as details on the Dante interface firmware.
The update process begins by preparing a USB flash drive. The flash drive doesn’t have to be empty (blank) but must be in the personal-computer-standard FAT32 for­mat. Save the new firmware file in the root directory with a name of m206.bin. Studio Technologies will supply the application firmware file inside a .zip archive file. While the firmware file inside of the zip file will ad­here to the naming convention required by the Model 206, the name of the zip file itself will include the file’s version number. For example, a file named m206v1r1MCU.zip would indicate that version 1.1 of the ap­plication firmware (m206.bin) is contained within this zip file.
Once the USB flash drive is inserted into the USB interface, located on the main cir­cuit board under the cover, the unit must be powered off and again powered on. At this point the file will automatically load. The precise steps required will be highlighted in the next paragraphs of this guide.
Application Firmware Update Procedure
It’s possible that updated versions of the application firmware (embedded software) that is utilized by the Model 206’s proces­sor (microcontroller or MCU) integrated circuit will be released to add features or correct issues. Refer to the Studio Tech­nologies website for the latest application firmware file. The unit has the ability to load a revised file into the MCU’s non­volatile memory by way of a USB inter­face. The Model 206 implements a USB host function that directly supports connec­tion of a USB flash drive. The Model 206’s MCU updates its firmware using a file named m206.bin.
To install an application firmware file follow these steps:
1. Disconnect power from the Model 206. This will entail removing the Ethernet connection that is providing PoE power.
2. Remove the cover from the Model 206. Use a #1 Philips head screw driver to remove six machine screws, two on the top edge of the back panel, one on each side of the unit, and two on the front edge of the bottom surface. Be certain to save the screws so that re-assembly will be fast and painless. Then carefully slide the cover forward, rotating it forward 180 degrees once it has cleared away from the three level potentiometers. Be very careful not to kink or damage the small ribbon inter­connecting cable.
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3. Locate the USB connector on the main circuit board. It’s near the front of the unit, directly between the channel 1 and channel 2 potentiometers. Insert the prepared USB flash drive into the connector.
4. Apply power to the Model 206 by con­necting to a Power-over-Ethernet (PoE) Ethernet source.
5. After a few seconds the Model 206 will run a “boot loader” program that will automatically load the new application firmware file (m206.bin). During this time period an LED, located adjacent to the USB connector, will slowly flash green. Once the loading process is over, taking approximately 10 seconds, the Model 206 will restart using the newly-loaded application firmware.
6. At this time the Model 206 is function­ing with the newly-loaded application firmware and the USB flash drive can be removed. But to be conservative, re­move PoE power first and then remove the USB flash drive.
7. Confirm that the desired firmware ver­sion has been correctly loaded. This can be done by pressing and holding the talkback 3 button, applying power to the Model 206, and then “reading” the application firmware version num­ber by first observing the main button’s green LED and then observing the talkback 1 button’s red LED. Alternate­ly, the STcontroller application can be used to identify the application firmware version number. Whatever method you use, ensure that the desired version is present.
8. Once the update process has been complete reverse the steps and re-at­tached the cover using the six machine screws.
Note that if a connected USB flash drive doesn’t have the correct file (m206.bin) in its root folder no harm will occur if power is applied to the Model 206. Upon power up the main button’s LED will flash on and off rapidly for a few seconds to indicate this condition and then normal operation using the unit’s existing application firmware will begin.
Ultimo Firmware Update
As previously discussed in this guide, the Model 206 implements Dante connectivity using the 4-input/4-output Ultimo integrat­ed circuit from Audinate. The Dante Con­troller software application can be used to determine the version of the firmware (embedded software) that resides in the Ultimo “chip.” The STcontroller software application can also be used to identify the firmware version. (Use the Version selec­tion under the Device tab.) The Dante firmware can be updated by way of the Model 206’s Ethernet connection. The lat­est Dante firmware file is available on the Studio Technologies website. The Dante Firmware Update Manager (FUM) appli­cation is used to install the firmware. This program is also available for download on the Studio Technologies website. It’s an­ticipated that a more automated method of updating Dante firmware will become avail­able. It this comes to fruition then it might offer a much simplified method of keeping the firmware current.
Issue 1, April 2018 Model 206 User Guide Page 26 Studio Technologies, Inc.
ANNOUNCER’S CONSOLE
MODEL 206
Restoring Factory Defaults
A command in the STcontroller software application allows the Model 206’s defaults to be reset to the factory values. From STcontroller select the Model 206 for which you want to restore its defaults. Select the Device tab and then select the Factory Defaults feature. Then click on the OK box. The values shown on the screen should reflect the default values. They are:
Microphone P48 Phantom Power: Off
Microphone Input Gain: 35 dB
Headphone Audio Sources and Routing:
Mode 1
Headphone Sidetone: Mic & Talkback
Buttons
Headphone Gain Range: Low
Headphone Minimum Level: –40 dB
Button Operation – Main: Push to Mute
Button Operation – Talkback 1,
Talkback 2, and Talkback 3: Push to Talk
System Operating Mode: On-Air
Remote Control Inputs 1 and 2: Off
Button Backlight Intensity: High
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ANNOUNCER’S CONSOLE
Specifications
Power Source: Power-over-Ethernet (PoE): class 2 (low power,
≤6.49 watts)
Network Type: Dante audio-over-Ethernet AES67-2013 Support: yes Dante Domain Manager (DDM) Support: yes Bit Depth: up to 24 Sample Rate: 44.1 and 48 kHz
Number of T
(main, talkback 1, talkback 2, talkback 3) Number of Receiver (Input) Channels: 4
(Headphone Ch1, Headphone Ch2, Headphone Ch3, Headphone Ch4)
Dante
Network Interface:
T
ype: 100BASE-TX, twisted-pair Ethernet, Power-
over-Ethernet (PoE) supported Data Rate: 100 Mb/s (10 Mb/s and 1000 Mb/s
“GigE” Ethernet not supported)
Microphone Input: Compatibility: dynamic or phantom-powered
microphones
T
ype: balanced, capacitive coupled Impedance: 2 k ohms, nominal Gain: 35, 43, 52, 59 dB, selectable Frequency Response: 25 Hz to 20 kHz, –3 dB Distortion (THD+N): <0.022%, measured at 35 dB
of gain
Dynamic Range: 96 dB, A-weighted Phantom Power: P48 per IEC 61938 standard,
on/of
Compressor: Application: applies to Dante main and talkback
transmitter (output) channels
Threshold: 1 dB above nominal level (–19 dBFS) Slope: 2:1 Status LED: compressor active
Audio Technology:
ransmitter (Output) Channels: 4
Audio Flows: 4; 2 transmitter, 2 receiver
f selectable with status LED
MODEL 206
Microphone Output: Type: passive via two 200 ohm resistors from
microphone input (will pass phantom power in either direction)
Muting: solid-state relay contacts, 60 dB attenuation @ 1 kHz
Headphone Output:
T Compatibility: intended for connection to stereo
(dual-channel) or monaural (single-channel) headphones, headsets, or earpieces with nominal impedance of 50 ohms or greater
Maximum Output V
150 ohm load
Frequency Response: 20 Hz to 20 kHz, –2 dB Distortion (THD+N): <0.002% Dynamic Range: >100 dB
Remote Control Inputs: 2 Functions: configurable to mimic the action of the
main, talkback 1, talkback 2, or talkback 3 button functions
T
3.3 volts DC
Connectors: Microphone Input: 3-pin female XLR Microphone Output: 3-pin male XLR Headphone Output: 3-conductor ¼-inch jack Remote Control Inputs: 3-conductor 3.5 mm jack Ethernet: Neutrik etherCON RJ45 USB: type A receptacle (located inside Model 206’s
enclosure and used only for updating fi
Configuration: requires Studio Technologies STcontroller personal computer application, version
1.05.00 and later (STcontroller compatible with Windows® version 7 and later)
Dimensions (Overall):
4.3 inches wide (10.9 cm)
2.1 inches high (5.4 cm)
5.1 inches deep (13.0 cm)
Deployment: intended for tabletop applications
W
ype: 2-channel (stereo)
oltage: 3.8 Vrms, 1 kHz,
ype: active low, 1 mA maximum, inputs pull up to
rmware)
eight: 1.2 pounds (0.55 kg)
Specifications and information contained in this User Guide subject to change without notice.
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ANNOUNCER’S CONSOLE
MODEL 206

Appendix A: Model 206 Block Diagram

The following block diagram shows a simplified version of the Model 206’s microphone input and microphone output circuitry.
Model 206 User Guide Issue 1, April 2018 Studio Technologies, Inc. Page 29
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