ALL UNDER ONE ROOF. TRANSRADIO We have your Solution

Transcription

1 ALL UNDER ONE ROOF TRANSRADIO We have your Solution

2 DRM (DIGITAL RADIO MONDIALE) Radio goes future we show IT The major advantage of LF, MF and HF broadcasting in the frequency range below 30 MHz is the huge achievable coverage. While all other technologies need an extensive network with a high number of transmitters, AM broadcasting requires just a few transmitters, providing a program to particular target groups in a large geographical area. Because listeners were accustomed to the high quality of VHF/FM broadcasting, upgrading AM with a new technology was required to deliver the same high standards. Implementing the digital broadcasting technology DRM gives substantial improvements in audio and reception quality. Robustness in fading channels Significant improvement in audio quality Power savings at the transmitter site Service related data (service labels, alternative frequencies and language information) Data services (pictures, text- and traffic information) News Service Journaline TM Optional Fraunhofer DRM ContentServer TM R4 MDI data Digital Radio Mondiale (DRM) is the name of the international consortium, which defined the standards for digitalisation of AM broadcasting. DRM was founded in 1998 and developed a digital radio standard which is endorsed by the IEC, ETSI and ITU. TRANSRADIO, formerly TELEFUNKEN SenderSysteme Berlin, as a founding member of this consortium, has tremendously influenced this standard with its experience and knowledge in broadcasting. TRANSRADIO has established itself as the leading DRM provider. Today TRANSRADIO has the highest number of installed DRM transmitters in service. Audio

3 OVERVIEW OF THE DRM SOLUTIONS GPS-antenna or external clock TRAM TX1 RF drive DRM DMOD3 ENV1 RF out Paralleling unit Antenna Antenna RF ENV2 TRAM TX2 RF out RF drive RF back (directional coupler) Optional Fraunhofer DRM Monitoring Receiver DT 700 RF back

4 TRANSRADIO RIDES ON DRM POTENTIAL TRANSRADIO has established itself as the world s leading DRM provider. Today, TRANSRADIO has the highest number of installed DRM transmitters in service. DRM Medium Wave Transmitting Station Cremlingen MW 800kW MW transmitter TRAM/P 800 Carrier power of 800kW (>400kW DRM) in Cremlingen/ Braunschweig (Germany) Marnach MW 600kW MW transmitter TRAM/P 600 Carrier power of 600kW (>300kW DRM) in Marnach (Luxembourg) Heusweiler MW 400kW MW transmitter TRAM/P 400 Carrier power of 400kW (>200kW DRM) in Heusweiler (Germany)

5 DRM Long Wave Transmitting Station Zehlendorf LW 500kW LW transmitter TRAM/P 500L Carrier power of 500kW (>250kW DRM) in Zehlendorf (Germany) Donebach LW 500kW LW transmitter TRAM/P 500L Carrier power of 500kW (>250 kw DRM) in Donebach (Germany) Summerhill LW 300KW LW transmitter TRAM 300L Carrier power of 300kW (>150 kw DRM) in Summerhill (Ireland)

6 DRM THE ECONOMICAL WAY TO REACH YOUR LISTENERS The DRM power is normally given as the average power of the digital modulation. Because of the high modulation peaks of the DRM signal, the average power is significantly lower than for the same transmitter operating in the analog AM mode. In general a DRM COFDM waveform has a peak to average ratio of about 10 db. Thus a standard DRM transmitter with a carrier power of 100kW and 100% modulation reaches a peak power of 400kW. The DRM power of such a transmitter is only 40 kw. As a result, for the same coverage, up to 60% of the power can be saved running an AM transmitter in DRM. In contrast to standard transmitters, TRANSRADIO s TRAM family of transmitters attain a DRM power of up to 73% of their nominal power with all quality requirements fulfilled: the MER value is well above the minimum DRM requirement and the out-of-band emissions are considerably within the DRM spectrum mask. This is possible due to the overmodulation capability of the TRAM transmitters and a peak-to-average ratio reduction scheme implemented in the DRM DMOD3. Thus, TRANSRADIO s TRAM family of transmitters produce nearly two times the DRM power compared to a standard transmitter.

7 SFN EXTEND THE COVERAGE SFN-Berlin: 3 TRAM 10, 1485 khz A single frequency network (SFN) is a radio network that operates several transmitters on a single frequency and has overlapping coverage areas. SFN s are an efficient method of extending the coverage area without the need for additional frequencies. Signals arriving from transmitters outside the local transmitter area can reinforce reception and recover losses through local anomalous propagation effects. Any receiver in the coverage area of these transmitters will receive the signal from more than one transmitter. Different paths that arrive from distant transmitters in the SFN must arrive with a delay separation that is less than the guard interval duration, or otherwise inter-symbol interference occurs. To avoid interference, each station is run synchronously with the others using GPS as a reference clock. The built-in GPS receiver of the DRM DMOD3 from TRANSRADIO is implemented for single frequency networks. Tests in the medium wave band, conducted in cooperation with MEDIA BROADCAST GmbH and in the short wave band, in cooperation with the DRM consortium demonstrated the readiness of the DRM DMOD3 for all types of SFN's.

8 OVERVIEW FRAUNHOFER DRM CONTENTSERVER R4 Optional Fraunhofer DRM ContentServer TM R4 MDI data Audio Overview of the DRM ContentServer TM R4 GPS The system has 3 major interfaces: Audio Data DRM AudioServer DRM Multimedia DataServer The Fraunhofer DRM ContentServer R4 is designed to meet all the demands of DRM broadcasters, DRM network providers and DRM transmitter operators with regard to DRM Multiplex generation. The system is typically located in the studio or a playout center or at the transmitter site with full remote control for administration and data provision. The Fraunhofer DRM ContentServer R4 is based on robust and redundant 19 server hardware for reliable 24/7 operation. The Fraunhofer DRM ContentServer R4 provides triple functionality: DRM Multiplex Generator Config Interface FAC SDC MSC MDI / DCP Interface Remote Configuration/ Administration DRM Modulators DRM Audio Server With multi-stream real time audio encoding DRM Multimedia Data Server Providing all standardized as well as proprietary mechanisms for data application import, preparation, encoding and broadcast DRM Multiplex Generator Managing the extensive DRM signalling capabilities, generating the full digital DRM Multiplex and providing standard MDI/DCP output streams. The system can easily be scaled to match individual requirements and to support proprietary data applications. Configuration and Administration: The system is designed to be administered remotely using any modern HTML browser. The system status is available via remote HTML interface (including detailed status information), automatic report system, local status monitor, relay board signalling and SNMP. Audio and Data Input: For audio input, the system supports up to 4 digital AES/EBU or up to 4 analog stereo signals. In addition, playlists and mp3 files can be uploaded to the system for offline audio encoding. Data for multimedia applications can be provided using a variety of standard protocols (e.g. FTP, HTTP, RSS, UECP, Leitungsprotokoll, Funkhaustelegramm). Powerful mirroring features provide automatic and scheduled data updates e.g. from FTP, HTTP and RSS sources on the web. DRM Multiplex Output via MDI/DCP: The complete digital DRM multiplex generated by the Fraunhofer DRM ContentServer R4 can be fed simultaneously to any number of DRM modulators or monitoring stations for multi-frequency or SFN broadcasts. The output stream uses the standardized MDI/DCP protocol supported by all standard compliant DRM modulators and monitoring equipment via UDP/IP based or serial connections.

9 Features of the DRM ContentServer TM R4 Public Network Content Contribution Firewall / Security Protected Privat Network Broadcast Distribution Chain Administration (Webbrowser) Time sync GPS, ntp Audio 1-4 Streams (live/playlist) Data Application DRM Text Messages News Service Journaline MOT Slideshow MOT Broadcast Website TPEG Traffic Information EPG-Electronic Program Guide TOP News TMC-Traffic Message Channel DRM Audio Server 4 x (AAC, CELP,HVXC) DRM Multimedia Dataserver TM SNMP DRM Multiplex Generator Analoge/ Relay Local status/ ISDN notification Modem card Config menu System Status MDI / DCP Local / long distance Any number of simultaneous outputs (SFN) IP uni-/multicast RS-232

10 THE NEW DRM DMOD3 - THE ALL IN ONE SOLUTION

11 OVERVIEW DRM DMOD3 The aim of the new DRM DMOD3 is to offer highly automated configuration procedures, maximum reliability, low power consumption, low heat dissipation and a compact and ergonomic design. All broadcasting modes are possible. The DRM DMOD3 offers easy and fast switchover facility between analog AM, pure DRM, single channel or multi channel simulcast. Core features of the new DRM exciter are the automatic equalizer adjustment and the integrated antenna voltage standing wave ratio (VSWR) measurement capability, which offers a very precise and fast method to set up DRM equipment. The DRM DMOD3 is designed for mounting in standard 19 racks of 4U height. It eliminates the requirement for a separate RF processor and offers a significant reduction in external wiring. Low power consumption, reduced operating temperature and a higher MTBF have been achieved by implementing notebook technology components and a harddisk-free design. New Features: Operation modes Operation modes AM, DRM, SCS and MCS Fast switchover Fast switchover is accomplished in less than 5 seconds between all operation modes Automatic Equalizer Adjustment Easy signal correction with automatic equalizer adjustment VSWR Measurement of the Antenna Integrated RF Processor The DRM DMOD3 fits into a single 4RU Case Significant reduction of external wiring Low Power Consumption Harddisk-free design Use of notebook components Now all DRM-Modes fully supported! Ergonomic Design Increased display size of 8.4 Provides a resolution of 800x600 for easy readability Simple to operate without the need of a external keyboard Improved Reliability Harddisk-free design for better MTBF Wide ambient temperature range up to 50 C Mode A Mode B Mode C Mode D Nominal Bandwidth (9/10 khz) Half Bandwidth (4.5/5 khz) Double Bandwidth (18/20 khz) 64QAM MSC, all Code Rates 16QAM MSC, all Code Rates 16QAM SDC 4QAM SDC Standard Modulation Hierarchical Modulation Equal Error Protection Unequal Error Protection Long/Short Interleaving = supported

12 VSWR MEASUREMENT, HARDDISK-FREE DESIGN Dual-flash storage architecture: Safe like a safe Harddisk-Free Memory Architecture The new memory architecture of the DRM DMOD3 offers maximum reliability due to the harddisk-free design. All necessary data to boot up and to run the DMOD3 are stored on a static permanent storage (flash1), which has read only access. Inessential dynamic data for logging and configuration, which are written occasionally, are stored on a second flash memory (flash 2). This separation of the essential and inessential data on two flash storage devices was made to increase the reliability of the architecture, since the likelihood of failure of a flash memory is determined mainly by the number of write cycles. Example of an Antenna VSWR VSWR Measurement of the Antenna The DRM broadcast must be compliant with the ITU spectrum mask and requires low antenna VSWR. The DRM DMOD3 is capable of measuring the VSWR of the antenna during DRM operation and to show the result on the screen. This enables the broadcaster to monitor antenna matching during regular operation without additional measuring equipment. Furthermore the DRM spectrum is measured and is visualized by the integrated DRM DMOD3 web server. Mandatory - Read only Static permanent storage Startup Programs Permanent config Flash1 Dynamic permanent storage Inessential for normal operation Log files Dynamic configuration Flash2 Data Processing Memory Architecture Dynamic volatile storage Temporary data Fast logging RAM Disk

13 DRM RESERVE AND FALL BACK SYSTEMS Active DRM Reserve MDI DRM DMOD3 -A The active DRM reserve offers a maximum of reliability for a DRM system. Two DRM exciters supervise each other during normal operation. In the unlikely event of failure of one DRM exciter, the remaining exciter takes over the service and keeps the transmitter(s) on air. In an active reserve, double exciter system the test points of the transmitter(s) are switched as well. MDI Audio Audio Supervision Link RF, Envelope Control Unit RF, Envelope TX Antenna DRM Exciter Fall-Back Solution The exciter fall-back solution gives the opportunity to fall back from DRM transmission to AM, DAM or AMC modulation in the unlikely event of failure of the digital exciter. In fall back mode the audio signal bypasses the digital exciter. The internal synthesizer of the transmitter provides the RF signal and the transmitter is kept on air by means of the internal AM modulator. MDI Audio DRM DMOD3 TX Antenna RF Envelope Audio Control Unit RF from TX-Synthesizer RF Envelope Audio Combination of Active DRM Reserve and DRM Exciter Fall-Back In order to further increase the reliability of the DRM system, the Active DRM Reserve and the Exciter Fall-Back Solution can be combined. In the unlikely case of the failure of both DRM exciters the internal synthesizer of the transmitter provides the RF signal.

14 OPTIMIZATION OF THE DRM SPECTRUM The DRM DMOD3 provides automatic functions to pre-equalize the transmitted signal in order to minimize the out-of-band emissions. The aim of the pre-equalization process is to reduce the influence of linear and non-linear distortions on the DRM signal. The following pre-equalization functions are supported by the DRM DMOD3: Optimisation Process AM/AM AM/PM H (j ), DC Compensation of Non-linear Distortion I Compensation of Non-linear Distortion II Compensation of Linear Distortions Adjustment of the Time Delay and the DC Offset Measurement of the amplifier characteristic (AM/AM characteristic) Calculation of a correction curve Pre-equalization of the transmission signal Measurement of the incident phase modulation (AM/PM characteristic) Calculation of a correction curve Pre-equalization of the transmission signal Measurement of the envelope frequency response Calculation of an equalization filter to compensate the amplitude frequency response and the group delay distortions The DRM DMOD3 offers a sophisticated algorithm for optimal adjustments between the delay differences of the amplitude- and phase signal as well as the DC offset. Pre-equalization of the transmission signal

15 SPEED UP YOUR BUSINESS One Button Automatic Equalizer Adjustment Broadcast operators demand an automated configuration procedure for DRM equipment and the DRM DMOD3 is the answer. The DRM DMOD3 provides automated functions to pre-equalize the transmit signal in order to reduce out-of-band emissions. The equalizer adjustment can be performed automatically just by the push of a button. The DRM DMOD3 auto-adjust of the equalizer offers: Automatic initial equalizer adjustment Equalizer optimization during DRM operation Adaptive equalization Automatic switching of up to three different test points Crucial parameters like time delay, DC offset and envelope frequency response are optimized in order to minimize out-of-band emissions DRM DMOD3 MDI MDI Decoder & OFDM Generator I,Q Equalizer I-Q to A-Phi Conversion Phi A Delay Adjustment Envelope Filter Upsampling & RF-Output Phase modulated RF Envelope TX A-Phi Delay Filter Coefficients DC-Offset DRM DMOD3 Auto - Adjust Test Point 1 RF-Input & Downsampling Measuring Point Switching device Test Point 2 Test Point 3 Block Diagram of the Automatic Equalizer Adjustment

16 OVERVIEW TRAM TX1 TRAM TX2 Many years of experience in the field of high power transmitters in conjunction with the latest state of the art transistor technology has paved the way for a future oriented and meanwhile well established solid state transmitter concept. As opposed to conventional transmitters the simple modular system of solid state medium wave transmitters from TRANSRADIO offers a maximum of flexibility and unsurpassed audio quality. The TRAM Premium line based on the new developed power modules secures optimized DRM parameter while achieving an outstanding overall efficiency in all operation modes. The TRAM Premium Line optimized for DRM Transmission All TRAM Premium line transmitters are optimized for digital transmission and exceed the DRM recommendations. The layout, in standard 19" racks, allows for easy and comfortable access to all components and modules and results in exceptionally low space requirement for the respective power classes. The power amplifier stage offers true modular redundancy through the use of standardized 1 kw amplifier modules. Each individual module is equipped with an on-board PDM modulator and no quantization problems occur. Designed with a high power reserve capability, each module provides full signal quality on its own. TRAM 400

17 RIDING THE LONGWAVE Long Wave Transmitter TRAM/P 500L (500kW) from TRANSRADIO in Zehlendorf Longwave is well known for excellent ground wave coverage hence, offering a stable reception. DRM on LW combines the advantages of digital transmission with very good longwave propagation. On the other hand, narrow band longwave antennas with considerable mismatch even inside the transmission bandwidth are posing a big challenge to the broadcast industry. TRANSRADIO has accepted this challenge and has successfully modernized several LW transmission stations with its DRM solution. The DRM installation on LW needs completely to fulfill the requirements concerning the out-ofband emissionsof ETSI EN and ITU SM Therefore, TRANSRADIO implements an Extension Network (ENW) to eliminate the disadvantages of the asymmetrical antenna impedance and to reduce mismatch. This results in a reduction of the standing wave ratio and a significant mask reserve. A world premier was achieved when the TRANSRADIO transmitter in Zehlendorf (Germany) broadcast for the first time DRM on long wave in accordance with the ETSI/ITU standard. Since then TRANSRADIO reconfirmed impressively its leading position with respect to LW and has modernized LW transmitting stations, for example, in Donebach, Aholming (Germany) and Summerhill (Ireland). Spectrum of the transmitted Signal in Zehlendorf Burg Mainflingen Kalundborg, DK Long Wave-Antenna in Zehlendorf (360m) Burg, Mainflingen and Kalundborg are Signals received from other Stations

18 OVERVIEW FRAUNHOFER DT 700 DRM MONITORING RECEIVER rive (directional coupler) Optional Fraunhofer DRM Monitoring Receive DT 700 Concept The DRM Monitoring Receiver DT 700 is a professional monitoring receiver perfectly suited for DRM reception and transmitter monitoring. It features a high performance front-end based on the latest direct sampling reception technology. Together with a 12-band fix-tuned preselector filter bank, the DRM Monitoring Receiver DT 700 guarantees an outstanding reception performance and low phase noise. The receiver's signal processing is based on a Software Defined Radio (SDR) construction. Its core is an embedded Linux PC. The latter features an easy software update via built-in DVD drive. The highly reliable hardware is built for 24/7 continuous operation as is necessary for a professional broadcast environment. Based on the embedded Linux platform a web server allows easy remote access to all of the receiver's control functions. The DRM Monitoring Receiver DT 700 is available with two different reference oscillator accuracies standard oscillator (5ppm, Option B1) or high precision OCXO (<0.1ppm, Option B2). Protection 12 band preselector AGC Front-end Control Overview of the DRM Monitoring Receiver Typical Applications for the DT700 are... General Purpose DRM / AM / SSB Reception High performance front-end transmitter monitoring Modulation quality measurement (up to 40 db S / N) Modulation parameters Two configurable alarm signals (relay switch) Spectrum Monitoring Spectrum plot with default DRM parameters Frequency span up to 60 khz A D Channel Decoder Alarm Relays Control Multiplex Channel Decoder RSCI Interface Ethernet Embedded Linux Audio Decoder WebServer Display Keys Within Monitoring Networks Full remote control via LAN Local logging of RSCI RSCI output (compatible with ETSI TS V1.2.1) via LAN Alarm signals configurable to conditions to initiate triggering (e.g. audio dropouts or field strength) QoS (Quality of Service) monitoring Highly accurate field strength measurement

19 r REMOTE CONTROL AND ERROR TRACKING VIA SNMP AND HTM TRAMtransmitter SMS-messages Ethernet Client with standardwebbrowser SNMPmanagement system Ethernet Interface Card ISDN/ PSTN router Mailserver NTP-server for time-synchronisation This function gives broadcast operators the freedom to control their equipment from any place in the world. Each individual transmitter or paralleling unit (PU) is optionally accessible via SNMP and HTML. The network access can be via dial-in (PSTN, ISDN) or Ethernet connection (TCP/IP). The web server and the SNMP MIBs (management information base) offer all necessary functions to remotely control the transmitter and display failure messages. SNMP As a result of standardized SNMP-MIB implementation, the SNMP functions can be seamlessly integrated in a SNMP management system. If a failure occurs, traps are sent by the SNMP agent. SNMP traps can be collected and presented by a central management system. Also transmitter parameters can be modified via set commands. In addition, SMS messages and s can be sent to the operator and the clock can be synchronized by an NTP-server. Web Access via HTML Based on a web server, all necessary functions of a transmitter system can be monitored and controlled by a standard browser no proprietary software is required. Standardized SNMP-MIB of a TRAM Transmitter Webinterface of a TRAM Transmitter

20 AM ANTENNAS FROM TRANSRADIO DESIGNED FOR DRM TRANSRADIO is dedicated to the design and development of AM antennas and related systems for broadcasters and to provide consultation to adapt and improve existing AM antennas especially for DRM. High quality DRM transmission without violating the specified spectrum mask requires high demands on antenna systems. In particular, broad impedance bandwidth is needed as well as symmetric characteristics of impedance related to the carrier frequency. TRANSRADIO stays at the forefront of the latest DRM technologies through innovative solutions to technical challenges. Horizontal Cross Dipole Antenna for MW Broadcasting in Mainflingen (Germany) Our product portfolio includes: Directional and omni-directional antennas Antenna tuning devices including (diplexers, triplexers, quadplexers, filters ) Extension Networks (ENW) Antenna switching matrix s RF feed lines Dummy loads (air-cooled, water-cooled) Optimisation of existing antenna designs especially to improve bandwidth and static grounding of all antenna parts Computer Model of the Cross Dipole Antenna Mainflingen Vertical Pattern of Cross Dipole Antenna for Suspension Height of 0.4 Lamb

21 OVERVIEW Antenna Antenna Antenna Tuning Unit (ATU) in Szolnok (Hungary) Extension Network (ENW) in Donebach (Germany) The Extension Network is the Key The quality of the DRM signal in the coverage area depends significantly on a well designed antenna system. Bandwidth and radiation characteristics are important criteria for good performance when choosing an antenna type. Years of experience with industry standard tools has given us the capability to design all types of antennas. In order to adapt existing AM antennas especially for DRM, narrow band AM antennas with considerable mismatch even inside the transmission bandwidth are posing a big challenge to the broadcast industry. TRANSRADIO has accepted this challenge and modernises AM transmitting stations for DRM according to the requirements with respect to the out-of-band emissions of ETSI EN and ITU SM The key to fulfill the requirements is the Extension Network (ENW). The ENW is implemented to eliminate the disadvantages of the asymmetrical antenna impedance and to reduce mismatch.

22 DRM CONSULTING ASK THE EXPERTS DRM Upgrade Kits Many broadcasters still use transmitters built in the 1970s and 1980s. Securing investments is an important issue for broadcasters. Therefore an increasing number of broadcasters made the decision to upgrade their transmitters with DRM exciters. TRANSRADIO delivers the solutions to upgrade these systems with DRM exciters and offers site surveys to define the best upgrade solution. The TRANSRADIO DRM exciters have not only proved their compatibility to transmitters built by TRANSRADIO but also their ability to operate with transmitters from other manufactures. DRM Antenna Tuning TRANSRADIO provides consulting to develop complete AM antenna systems and to deliver, adapt and improve AM antennas especially for DRM. In general, TRANSRADIO employs Extension Networks (ENW) in order to reduce unwanted phase modulation in the antenna and the mismatch of the load. The transmitters have a maximum of transmission quality because they operate on a wide-band matched load. DRM Planning Guidance The calculation of the necessary DRM power of the transmitter depends amongst other things on the ground conductivity, the robustness of the DRM mode, frequency and the required electrical field strength. The TRANSRADIO consultant service provides the necessary information to dimension your DRM system.

23 TECHNICAL DATA DRM DMOD3 Inputs for DRM Modulation Data Inputs for Audio Signals for AM, DRM or Simulcast Transmissions Remote Control Modulator Supported DRM Modes RF Signal Amplitude Signal Power Supply Synchronization V.24/RS232 asynchronous serial port with MDI protocol 10/100/1000 Mbit Ethernet port for UDP data transfer using MDI protocol Standard XLR connectors for analog signals with normal line level (+2dBV max.) at 10 kohm Standard XLR connectors for AES/EBU digital audio input Toslink connectors for ADAT optical audio input V.24/RS232/Network connection with Bitbus syntax Graphical user interface over IP Web interface Industrial 19 4U rack mountable; Linux OS Modes A, B, C and D with bandwidths of 4.5, 5, 9 and 10 khz for A/Phi transmitters; 18/20 khz in addition for linear transmitters Error protection: EEP and UEP Standard and hierarchical modulation Direct-Digital-Synthesis signal generation Tuneable frequency range from 9 khz to 26.1 MHz Output level 5 Vpp at 50 Ohm Sampling rate of 192 khz Frequency range from 0 Hz to about 80 khz Output level 2 Vpp at 600 Ohm V single phase integrated GPS synchronization Environmental Conditions Temperature: C Humidity: % RH, non condensing Fast Switchover Other Fast switchover is accomplished in less than 5 seconds between all available modes (DRM, AM, Simulcast ) RF input for measurement and equalization functions with three selectable input connectors

24 PORTS AND CONNECTORS DRM DMOD3 Rear View DRM DMOD3 GPS RS-232 Synchronisation via GPS or external clocks RF output to TX sin and square RF input probes from TX Envelope output to TX RS-232 serial ports for remote control, MDI data and UPS Signalling relays Digital audio inputs AES/EBU Analog audio inputs Network interface ADAT digital optical audio USB Mains V ~

25 design: HUSS-MEDIEN GmbH photos: Transradio SenderSysteme AG, Wolfgang Korall, Kluwe-Yorck VIDEO MEDIOS S.A. C/ Batalla de Brunete, Fuenlabrada (MADRID) SPAIN 32 Tel::