DAR3000C01 AES/EBU DIGITAL AUDIO REFERENCE SIGNAL GENERATOR. Version 1.0. Albalá Ingenieros, S.A. Medea, Madrid - Spain

Transcription

1 DAR3000C01 AES/EBU DIGITAL AUDIO REFERECE SIGAL GEERATOR Version 1.0 Albalá Ingenieros, S.A. 12 December Albalá Ingenieros S.A. - All rights reserved Medea, Madrid - Spain

2 DAR3000C01

3 DAR3000C01 AES/EBU DIGITAL AUDIO REFERECE SIGAL GEERATOR Version DESCRIPTIO The DAR3000C Features Block diagram SPECIFICATIOS ISTALLATIO Initial inspection Safety instructions Environmental considerations Power considerations Module configuration Selection of 20 or 24 bits Selection of the audio tone level Manual/automatic selection of the reference input Selection of the sampling frequency Selection of the external reference input Selection of the termination for the AES/EBU reference input Installing the module in the mounting frame Interconnection Digital audio connections Analog video and word-clock connections OPERATIO Front panel description Functional description Operating description of the external sync inputs Tone insertion operation The status channel Module remote control and supervision Details of the DAR3000C01 registers GLOSSAR REGULATIOS VERSIOS... 31

4 DAR3000C01

5 1. DESCRIPTIO 1.1. The DAR3000C01 The DAR3000C01 module is a digital audio reference signal generator. It includes composite video reference inputs, digital audio reference inputs and word-clock references inputs and can synchronize to any of them. A temperature-compensated quartz crystal oscillator (TCXO) is provided to generate the reference signal when no external reference source is available. The output signal uses the AES3 format and is provided on four outputs. In addition, there are two BC outputs that provide the word-clock. Synchronization to the video signal is performed as per AES11. The reference signal delivered at the output is normally set to silence, but it can also be a tone with an amplitude of 0 dbfs, -18 dbfs or -20 dbfs. The tone frequency can be either 400 Hz or 1 khz. In addition, periods of silence can be added to the tone signal in order to create dips for identification of the audio channels. The module accepts reference signals of three different types: PAL or TSC video signals (black burst), audio sampling frequency signals (word-clock) and AES/EBU digital audio signals as per AES11. If no signal is available at any of the inputs, the module outputs a signal with a user-selectable frequency of 32, 44.1, 48, 64, 88.2 or 96 khz, synthesized by the TXCO oscillator whose long-term stability is Grade 1 (frequency error is less than 1 ppm). The front panel of the module contains LEDs that indicate the reference input selected and the synchronization status at all times. It is possible to monitor the DAR3000C01 status remotely using a communications controller module installed in the same mounting frame. In addition, certain controller modules provide SMP management and the ability to record events in a file including date and time information for further analysis. The DAR3000C01 is a TL3000 terminal line module and can be housed in a three rack unit (3 RU) UR3000 mounting frame or a 1 RU UR3100 mounting frame. 5

6 1.2. Features High stability AES/EBU digital audio reference generator. Provides four transformer isolated AES/EBU digital audio outputs. Provides a word-clock reference output distributed to two connectors. Grade 1 frequency stability without external reference as per AES11 (±1 ppm). Wide locking margin for the external reference: ±50 ppm. Low jitter. Generates the following common sampling frequencies: 32 khz, 44.1 khz, 48 khz, 64 khz, 88.2 khz and 96 khz. All sampling frequencies generated are completely error-free with respect to the input reference for all input references and all sampling frequencies. Accepts three different reference signal types: black burst, word-clock and AES/EBU digital audio. Word-clock and AES/EBU outputs are phase locked. Digital audio reference input provides loop-through, is balanced and is transformer isolated. Word-clock and black burst reference inputs provide loop-through and are coaxial. Silence and tone generation capabilities. Tones can be generated with frequencies of 400 Hz or 1 khz, levels of 0, -18 and -20 dbfs and include optional dips for channel identification. 20 or 24 bit audio stream generation. Both the sampling frequency and the reference input can be selected manually or automatically. Front panel indicators for external sync presence and locking. Module control and supervision can be done remotely when the mounting frame is equipped with a communications controller module. One UR3000 mounting frame can house up to 12 DAR3000C01 modules. If power supply redundancy is required and FA3000 or FA3001 modules are used then only 10 modules can be housed in the mounting frame. If PSU3300 or PSU3301 modules are used for this purpose then up to 12 modules can be installed. One UR3100 mounting frame can house up to three DAR3000C01 modules. Low power. 6

7 1.3. Block diagram 7

8 DAR3000C01 8

9 2. SPECIFICATIOS AES/EBU digital audio signal output Connector Impedance Type Encoding and electrical characteristics Sampling rate umber of outputs Signal specifications with external reference: Jitter Jitter Locking range Signal specifications without external reference: Jitter Maximum frequency error Black-burst reference signal input Connector Return loss Type Signal format Accepted formats Input signal amplitude AES/EBU digital audio reference signal input Connector Impedance Type Encoding and electrical characteristics Sampling rate Word-clock reference signal input Connector Type Plug-in terminal, 3.81 mm pitch 110 Ω ± 20 % Transformer balanced According to EBU Tech E/AES3 standard 30 to 100 khz 4 <150 psrms fs 32 khz, 44.1 khz, 48 khz, 64 khz, 88.2 khz and 96 khz <250 psrms fs varispeed ±50 ppm <70 psrms ±1 ppm Grade 1 according to AES11 BC >30 db up to 5 MHz Passive Loop-Through or 75 Ω loaded According to ITU-R BT standard 625i50, 525i mvpp ± 6 db Plug-in terminal, 3.81 mm pitch Loop-Through or 110 Ω loaded Transformer balanced According to EBU Tech E/AES3 standard 30 to 100 khz BC Passive Loop-Through or 75 Ω loaded 9

10 Sampling rate Input level Word-clock reference signal output Connector Impedance Sampling rate umber of outputs Voltage levels with loaded output: VOL max. VOH min. General Maximum power supply current Operating temperature range Approximate weight khz, 44.1 khz, 48 khz, 64 khz, 88.2 khz and 96 khz 2-5 VPP BC 75 Ω 32 khz, 44.1 khz, 48 khz, 64 khz, 88.2 khz and 96 khz V 2.2 V / - 0 ma C 325 g

11 3. ISTALLATIO THE DAR3000C01 MODULE COTAIS ELECTROIC DEVICES SESITIVE TO ELECTROSTATIC DISCHARGE. Always use antistatic bags clearly identified with a high degree of shielding for storage and transportation. The DAR3000C01 module is composed of two parts: one DAT3000P03 main board and one DAR3000P02 rear board. Both parts must be installed in a UR3000 or UR3100 mounting frame following the instructions in the corresponding section of this chapter Initial inspection Verify that the package has been properly handled during transport. After opening the packaging, check that one DAT3000P03 main board and one DAR3000P02 rear board are inside. ou must notify your Albalá Ingenieros distributor or dealer of any damage or defects observed. Follow the instructions in this manual to install this module in the mounting frame Safety instructions This equipment must be connected to a mains outlet with a protective earth connection. ever use extension cords that do not have protective earthing connection. The lack of an effective electrical connection between the ground pin in the mains input connector of the equipment and the protective earth of the electrical power distribution can cause serious harm. All modules of the Albalá Ingenieros TL3000 terminal line can be hot-plugged or unplugged without suffering any damage or affecting the processes that are currently taking place in other modules in the same mounting frame. When a module is installed in an empty bay of a mounting frame, it is necessary to mount the rear board that is part of that module. Prior to installing this board, the mounting frame must be disconnected from the power supply network. This is required because in addition to the risk of electrocution for the person handling the device it is possible that a high instantaneous current coming from the power supply could damage the connectors and components of the mounting frame and/or the rear board. 11

12 The DAR3000C01 module and the mounting frame should always be installed, maintained, operated and removed by personnel with sufficient technical qualifications. The equipment should never be placed in damp areas, near splashing liquid, or in explosive or corrosive atmospheres. either modules nor mounting frames can be used in applications that could endanger human life Environmental considerations This symbol indicates that this equipment must be deposited at a collection point for proper waste treatment once it has reached the end of its useful life Power considerations The UR3000 and UR3100 mounting frames can house as many DAR3000C01 modules as will fit in them Module configuration The DAR3000C01 module provides both microswitches and program jumpers that should be set before installation in a mounting frame. These selectors allow the following: - Selection of the audio sampling bit depth to 20 or 24 bits. - Selection of the output sampling frequency. - Selection of the reference input. - Selection of the level of the audio tones generated. - Selection of loading or not for the inputs. 12

13 PROGRAM JUMPER AD MICROSWITCHES POSITIOS O THE BOARD Selection of 20 or 24 bits The DAR3000C01 module can deliver audio sampled at 20 or 24 bits in the AES/EBU stream. This selection is made via switch 1 of S1 as shown in the following table: MODE SW1 20 bits 24 bits O Selection of the audio tone level When the module generates audio tones, their level can be set to 0 dbfs, -18 dbfs or -20 dbfs. This selection is made via switch 2 of S1 as shown in the following table: LEVEL SW2 0 dbfs -18 dbfs ó -20 dbfs O Selection of -18 dbfs, -20 dbfs, the frequency of the audio tones and the insertion of periods of silence for channel identification can only be done via the module's control software, and this requires that a communications controller be installed in the same mounting frame. The module is configured at the factory such that the O position of the switch 2 selects -18 dbfs. 13

14 Manual/automatic selection of the reference input The DAR3000C01 module has two operating modes for selection of the reference input and the sampling frequency: automatic or manual. In automatic mode the reference input and the sampling frequency are adjusted automatically based upon a set of prioritized criteria. In manual mode the user selects both the reference input and the sampling frequency of the converter. This selection is made via switch 3 of S1 as shown in the following table: MODE SW3 AUTOMATIC MAUAL O The DAR3000C01 can also function without an external reference. In such cases manual mode should be used to select the sampling frequency and the selection of reference input is ignored, In manual mode, the reference input is selected using switches 4 and 5 of S1 as shown in the following: REFERECE SIGAL SW4 SW5 AES/EBU (AES11) 625 VIDEO lines 525 VIDEO lines SPDIF-2 WORD-CLOCK O O O O Selection of the sampling frequency In automatic mode the sampling frequency of the AES/EBU signal delivered is the same as the input reference signal the module is synchronized to. If the reference input is a video signal, the DAR3000C01 delivers a signal with a 48 khz sampling frequency. If a different sampling frequency at the output is desired, manual mode should be selected and that frequency selected using switches 6, 7 and 8 of S1 as shown in the following table: SAMPLIG FRECUEC SW6 SW7 SW8 32kHz 44,1kHz 48kHz 64kHz 88,2kHz 96kHz VARISPEED O O O O O O O O O O The varispeed mode only works in manual mode and with the AES/EBU reference input. In order to use this mode, set the switches of S1 as shown in the following table: 14

15 S1 SELECTIOS FOR VARISPEED MODE SW1 X SW2 X SW3 O SW4 SW5 SW6 O SW7 O SW8 O Selection of the external reference input The word-clock and black burst external reference inputs use the same connectors on the rear board and the type of signal that will be applied must be programmed. These inputs provide loop-through, but they can be internally loaded with 75 Ω if loop-through functionality is not needed. These functions are programmed using program jumpers J7 and J8 according to the diagram in the silkscreening Selection of the termination for the AES/EBU reference input The digital audio reference input is connected using a balanced line with loop-through. If a 110 Ω termination for this line is needed, program it using jumper J2 as shown in the silkscreening. The DAR3000C01 comes from the factory with the following settings: - 20 bit sampling frequency at the outputs. - Automatic mode for selection of the reference input and the sampling frequency - Loop-through activated for the reference inputs. - Audio tone level of 0 dbfs Installing the module in the mounting frame The steps needed to install the DAR3000C01 module with the rear board in the mounting frame are: 1 - Disconnect all power cords from the power supplies of the mounting frame. 2 - Remove the blank panels covering the front and rear of the empty bays chosen for installing the DAR3000C01 in the mounting frame. 3 - Install the DAR3000P02 rear board ensuring that its 12-pin connectors are properly aligned with the mounting frame s mating connectors. Check that the orientation of the board is correct by looking at the placement of the text printed on it according to the illustration below. 15

16 Details for installation of the module in 3 RU mounting frames Details for installation of the module in 1 RU mounting frames 4 - Attach the rear board to the mounting frame with two M3 metric screws and tighten. 5 - Verify that the main board is configured according to the user requirements. The configuration process is detailed later in the ISTALLATIO section of this manual. 6 - Insert the DAT3000P03 board (main board of the DAR3000C01 module) into the front of the mounting frame. The edges of the card slide into two plastic guides inside the mounting frame. 7 - Affix the main board to the mounting frame using the two screws included on the front panel. After these steps, the module is ready to be connected to other equipment. 16

17 3.7. Interconnection The following figure shows the DAR3000C01 module rear board connector layout. Rear view of the DAR3000C01 The DAR3000C01 provides four digital audio reference signal outputs (OUT1, OUT2, OUT3 and OUT4). It also includes two reference signal inputs (AES/EBU REF. LOOP I and REFERECE I (BB/WCLK)), and two audio frequency signal outputs (WORD-CLOCK OUT1 and WORD-CLOCK OUT2). The rear interconnection board is not designed to withstand mechanical stress. The wiring must be fastened properly to the frame where the mounting frame is housed to prevent the rear board from supporting the weight of the cables Digital audio connections Digital audio inputs are balanced and use 3.81 mm pitch terminal block connectors. The AES/EBU reference input provides loop-through but can be terminated with 17

18 110 Ω. This loop-through input can be used to send the signal to multiple generators. Keep in mind that this loop introduces a 0.4 db attenuation, equivalent to a loss of 5% of the signal amplitude. Therefore, it is not recommended to have more than five DAR3000C01 units connected using loop-through. If more than five units will be used, the system engineer should perform the necessary calculations based upon the length of the cabling and the signal amplitude in order to guarantee that the signal level at the last module in the loop is always greater than 300 mvpp. Digital audio outputs are balanced, use 3.81 mm pitch terminal block connectors and their characteristic impedance is 110 Ω. If an output signal in AES3id format is needed, an adapter as shown in the figure can be built. Albalá Ingenieros does not provide this adapter. TWISTED PAIR TO COAXIAL ADAPTER AS PER AES3id For digital audio connections 110 Ω characteristic impedance, two-wire shielded cable is preferred. The GD terminal allows connection of the cable shield Analog video and word-clock connections Coaxial cabling with a 75 Ω characteristic impedance such as RG59 should be used to connect analog video and word-clock signals. If the loop-through feature will be used to send the signal on to other equipment, make sure that the line is properly terminated at the endpoint. 18

19 4. OPERATIO This section describes the significance of the front panel indicators of the DAR3000C01 module and their remote control and monitoring ability Front panel description The appearance of the front panel and the elements it contains are shown in the following illustration. Front panel of the DAR3000C01 The panel contains the following elements: 19

20 In the REFERECE box: AES/EBU, CCVS, WORD-CLK: Blue. These are the reference input indicator LEDs. Each one corresponds to one of the three possible sync source inputs of the DAR3000C01, and they have two brightness levels. They light up at low brightness to indicate that a signal is present and then light up with full brightness to indicate that the corresponding input has been selected. If an external reference is detected but is not valid due to lack of sufficient level or an incorrect frequency then the corresponding LED will blink. In the SAMPLIG FREQ. box: 96.0 khz, 48.0 khz, 44.1 khz, 32.0 khz: Green. These LEDs indicate the sampling frequency of the AES/EBU signal being delivered at the outputs. Of the standard frequencies that the DAR3000C01 can generate, only 32, 44.1, 48 and 96 khz are indicated by these LEDs. In the TEST box: L, R: Green. This LED lights up when a tone is present in the two channels of the audio stream. L: Green. This LED lights up when a tone is present in this channel only and the other channel outputs silence. R: Green. This LED lights up when a tone is present in this channel only and the other channel outputs silence. TEST: Pushbutton. This button selects the insertion of a test tone. If the two associated LEDs are both off then the signal generated is of silence Functional description Operating description of the external sync inputs The DAR3000C01 can synchronize to three types of signals: PAL or TSC video, word-clock and AES/EBU digital audio. The module only has one coaxial input that is shared for the video reference and word-clock inputs. The type of signal accepted at the coaxial input depends on the configuration of the main board according to the description provided in the installation section of this manual. The module can receive external reference signals on both inputs (the AES/EBU input 20

21 and the coaxial input) simultaneously. Selection of the input used depends on the operating mode: automatic or manual. In automatic mode, the DAR3000C01 will always select the AES/EBU digital input when it is available. If not, the unit selects the coaxial input. When the module cannot sync to either external reference input, whether in automatic or manual modes, it then uses the TCXO oscillator as the clock master. This oscillator is also used during interruption or temporary loss of the reference signal, and the sampling frequency is maintained as whatever was last employed. The DAR3000C01 has a variable frequency quartz crystal oscillator (VCXO) of 27 MHz. This oscillator syncs to the frequency of the reference provided with a phase-locked loop (PLL). The standard sampling frequencies of 32, 44.1, 48, 65, 88.2 and 96 khz are generated with a direct digital synthesis (DDS) circuit that uses the 27 MHz oscillator. Whenever the module does not receive any external reference is uses its internal temperature compensated reference (TCXO) instead of the VCXO. The DAR3000C01 can operate without external references and outputs a Grade 1 signal as per AES11 using the internal TCXO. In automatic mode and without any external reference signal to sync, the module generates a 48 khz output. In manual mode is can generate standard sampling frequencies of 32, 44.1, 48, 64, 88.2 or 96 khz. When a sampling frequency other than the standard ones is needed, the module must be set to varispeed mode. In such cases the sampling clock frequency is obtained directly from the received reference AES/EBU stream. Varispeed operation can only be used in manual mode. In automatic mode the module can determine whether the video reference signal uses 525 lines or 625 lines, therefore no selection of this property is required Tone insertion operation Although the DAR3000C01 was designed as a reference signal generator with an output of silence, it also provides a test tone generator that can be used for level adjustment, replacing the standard output of silence. Insertion of a test tone is done by pressing the pushbutton on the front of the module as indicated by the following: In order to change the signal output of the DAR3000C01, press and hold the TEST pushbutton for longer than one second. Then use brief presses of this button to cycle through the different insertion modes. If the three corresponding LEDs are off then the output is silence; if the L, R LEDs are blinking then both left and right channels are delivering an audio tone; if only the L LED is blinking then the left channel carries an audio tone but the right channel is silence; finally, if only the R LED is blinking then the right channel carries an audio tone and the left channel is silence. In order to make the selection permanent, press and the hold the TEST pushbutton for longer than one second once again, until the LEDs stop blinking. This also stores the selection in non-volatile memory and this selection is recalled if the module is turned off and on again. If the insertion select is not confirmed, then after a minute the previous 21

22 configuration of the module is restored. The tone generator level of the DAR3000C01 can be set to 0 dbfs, -18 dbfs or -20 dbfs for all of the outputs. This level selection is done via the microswitch bank S1 of the module and from a computer if a communications controller is installed in the same mounting frame as the DAR3000C01. Selection of those outputs that generate a tone can only be done via the computer and remote control software. The tone frequency can be 400 Hz or 1 khz and can be adjusted independently for the L and R channels of outputs 1 and 2 and for the L and R channels of outputs 3 and 4. The frequency used is only selectable via the computer and control software. The DAR3000C01 comes from the factory programmed to generate silence at outputs 1 and 2 and a tone of 1 khz at outputs 3 and 4. The default amplitude of the generated tones is 0 and -18 dbfs, depending upon the settings of the configuration switches of the module. It is important to keep in mind that these tones are synthesized based upon the sampling frequency, and therefore in varispeed mode the frequency synthesized is provided by the following formula: ftone_nom is the nominal frequency for the tones that the module can generate and is either 400 Hz or 1 khz. fref is the sampling frequency of the AES/EBU reference signal entering the module and ftone is the actual frequency of the tone being generated. Another feature of the DAR3000C01 is the insertion of short periods of silence, or dips into the generated audio tones in order to identify the channels. These dips are repeated every ten seconds and last for one-half second each. The pattern followed by each channel of the digital audio stream is shown in the following figure. Also displayed is the sum and difference of both channels when they use a signal with the same frequency and phase, since it is easy to determine if a monophonic signal has been generated correctly. ote that in the case of summation, the resulting amplitude is twice that or the original signal (6 db greater). 22

23 DIPS ISERTIO PATTER The tone insertion feature can be activated or deactivated independently for outputs 1 and 2 and outputs 3 and 4 such that the DAR3000C01 can be used to generate two reference outputs with silence and two more outputs with whichever tones are required. Insertion of dips is only possible via the communications controller. The DAR3000C01 comes from the factory with dips insertion deactivated. Another useful feature derived from the two tones and the dips is identification of the four audio channels inserted into a video group The status channel The DAR3000C01 is an audio reference signal generator that creates its own status channel. Only the operating frequency is extracted from the the AES/EBU reference input and no other bits from the reference signal are used. The status channel bits are all user-configurable and are stored in the module's non-volatile memory. To access these bits, a communications controller must be installed in the same mounting frame as the DAR3000C01. The status channel programmed at the factory sets the first bit to one to indicate that it is a professional grade audio signal. The following 183 bits are set to zero and the last eight bits, forming the CRC, and calculated based upon the previous bits. 23

24 4.3. Module remote control and supervision The DAR3000C01 can optionally be remotely controlled/supervised. In order to perform remote configuration and supervision of the module an optional TL3000 family remote communications controller must be installed in the mounting frame. The main function of the communications control module is to interface between a 10/100 Ethernet port, an EIA-RS232 or an EIA-RS485 serial port and the internal bus of the mounting frame. The following illustration shows the most common control situations: from a computer or control panel via Ethernet, from a computer via an EIA-RS232 serial port and from a control panel via an EIA-RS485 serial port. Certain communications control modules provide additional, more advanced functions such as an SMP agent, logging of status changes of the modules and a Web interface for remote control, etc. Software for simple configuration and supervision with a GUI for multiple modules can be downloaded from the Albalá Ingenieros website. UR3000 ITERAL BUS TLE3100 LIK REMOTE COTROL UIT FULL DUP. 100M RX PCK. TX PCK. ERROR ETHERET EIA-RS485 RX CMD. TX CMD. ERROR EIA-232/485 RX DATA TX DATA OTHER TL3000 MODULES Et h t ne er TL3000 COMMUICATIOS COTROLLER MODULE er ne h Et t IT. BUS HUB/SWITCH h Et rn et UR3000 ITERAL BUS t Et he ne er TLE3100 LIK FULL DUP. 100M RX PCK. TX PCK. ERROR ETHERET RX CMD. TX CMD. ERROR EIA-RS232 EIA-232/485 RX DATA TX DATA IT. BUS Module remote control and supervision 24

25 The following functions of the DAR3000C01 can be performed remotely: - Configuration of the operating mode, the reference input and the sampling frequency of the signals being generated. - Selection of the content of the generated audio (tones, their frequency, dips, etc.). - Supervision of the presence of and sync to the reference inputs Details of the DAR3000C01 registers The DAR3000C01 module provides control and status registers that can be read and written by means of specific commands described in the communication control module user manuals. The parameter information grouped in the COTROL or RAM sections is stored in volatile memory. Any modifications to the parameters will be lost when the module power supply is disconnected unless the "EEPROM Save" button within the software has been pressed. The STATUS section parameters are read-only and cannot be modified. The parameters that can be controlled and supervised remotely for each version of the firmware are listed below: VERSIO 1.X COTROL ame add BITS 0x00 0x01 0DB_LEVEL 0x00 0x02 MODE 0x00 0x04 IPUT_REF 0x00 0x18 OUTPUT_FREQ 0x00 0xE0 DIP_EABLE 0x01 0x01 OPT_LEVEL 0x01 0x02 AUD_FREQ_CH1_L 0x01 0x10 AUD_FREQ_CH1_R 0x01 0x20 AUD_FREQ_CH2_L 0x01 0x40 AUD_FREQ_CH2_R 0x01 0x80 SILECE_L 0x02 0x01 SILECE_R 0x02 0x02 SILECE_CH1 0x02 0x04 ext msk snmp trap Description Allows selecting the number of bits 0=20, 1=24 Allows selecting the output audio level 0=0 dbfs, 1=-18/-20 dbfs Allows selecting the reference selection mode 0=Auto, 1=Manual Allows selecting the reference input in manual mode 0=AES, 1=BB 625, 2=BB 525, 3=WCLK Allows selecting the output samplign frequency in manual mode 0=32 khz, 1=44.1 khz, 2=48 khz, 3=64 khz, 4=88.2 khz, 5=96 khz, 6=Undefined, 7=Varispeed Allows enabling the insertion of silences for channel identification 0=Disabled, 1=Enabled Allows selecting the output audio level between -18 dbfs and -20dBfs 0=-18 dbfs, 1=-20 dbfs Allows selecting OUT1/OUT2 L audio frequency 0=1 khz, 1=400 Hz Allows selecting OUT1/OUT2 R audio frequency 0=1 khz, 1=400 Hz Allows selecting OUT3/OUT4 L audio frequency 0=1 khz, 1=400 Hz Allows selecting OUT3/OUT4 R audio frequency 0=1 khz, 1=400 Hz Allows muting left channel 0=o, 1=es Allows muting right channel 0=o, 1=es Allows muting OUT1/OUT2 0=o, 1=es 25

26 26 SILECE_CH2 0x02 0x08 ULOCK_AES_MASK 0x03 0x01 ULOCK_VID_MASK 0x03 0x02 ULOCK_WCLK_MASK 0x03 0x04 O_AES_MASK 0x03 0x10 O_VID_MASK 0x03 0x20 O_WCLK_MASK 0x03 0x40 STATUS ame add DET_625 0x00 0x01 DET_525 0x00 0x02 OUT_FREQ 0x00 0x70 AES_DET_FREQ 0x01 0x07 WCLK_DET_FREQ 0x01 0x70 ULOCK_AES 0x03 0x01 ULOCK_VID 0x03 0x02 ULOCK_WCLK 0x03 0x04 O_AES 0x03 0x10 O_VID 0x03 0x20 O_WCLK 0x03 0x40 ext msk snmp trap Allows muting OUT3/OUT4 0=o, 1=es Allows masking AES unlock fail 0=Disabled, 1=Enabled Allows masking video unlock fail 0=Disabled, 1=Enabled Allows masking Wordclock unlock fail 0=Disabled, 1=Enabled Allows masking no AES signal fail 0=Disabled, 1=Enabled Allows masking no video signal fail 0=Disabled, 1=Enabled Allows masking no Wordclock signal fail 0=Disabled, 1=Enabled Description 625 lines signal detected 0=o, 1=es 525 lines signal detected 0=o, 1=es Indicates the actual output sampling frequency 1=32 khz, 2=44.1 khz, 3=48 khz, 4=64 khz, 5=88.2 khz, 6=96 khz Indicates the AES reference detected frequency 0=o signal or <32 khz, 1=32 khz, 2=44.1 khz, 3=48 khz, 4=64 khz, 5=88.2 khz, 6=96 khz, 7=Other or >96 khz Indicates tje Wordclock reference detected frequency 0=o signal or <32 khz, 1=32 khz, 2=44.1 khz, 3=48 khz, 4=64 khz, 5=88.2 khz, 6=96 khz, 7=Other or >96 khz Indicates AES reference unlock fail 0=OK,1=Fail Indicates video reference unlock fail 0=OK,1=Fail Indicates Wordclock reference unlock fail 0=OK,1=Fail Indicates no AES reference signal 0=OK,1=Fail Indicates no video reference signal 0=OK,1=Fail Indicates no Wordclock reference signal 0=OK,1=Fail

27 5. GLOSSAR AES/EBU This acronym covers the combined AES and EBU standard for transmission of digital audio. The standard defines a serial interface known as AES3 as per AES, EBU 3250-E as per EBU or ITU-R BS as per ITU. The interface originally transmitted two channels (one pair) with PCM coding with a bit depth of 20 or 24 bit and a sampling frequency between 32 khz and 192 khz. Today the interface is also used as a framework to transmit digital signals that may or may not be audio with linear PCM encoding. The physical interface defined by the original AES/EBU standard was a 110 ohm balanced line. The AES3-id standard later defined the physical interface as a 75 ohm coaxial cable. db Logarithmic measurement to express ratios of power. dbfs db Full Scale. Level of an audio signal expressed in db relative to the maximum level that can be encoded in the PCM quantification scale used for the audio samples. 27

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29 6. REGULATIOS AES11 (2009) AES recommended practice for digital audio engineering - Synchronization of digital audio equipment in studio operations. AES3 (2003) AES Recommended practice for digital audio engineering - Serial transmission format for two-channel linearly represented digital audio data. See also: EBU Tech E, ITU-R BS AES3id (1995) AES information document for digital audio engineering - Transmission of AES3 formatted data by unbalanced coaxial cable. EBU Tech E (1992) Specificacion of the digital audio interface. See also: AES3, ITU-R BS (1998) ITU-R BT Conventional analogue television systems. See also: ITU-R BT.1700, SMPTE 170M 29

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31 7. VERSIOS Ver. Date Description Preliminary Version First version

32 Albalá Ingenieros, S.A. Medea, Madrid Spain